CN117447167A - Long-life low-carbon ferro-aluminate cement concrete and preparation method of segment made of same - Google Patents
Long-life low-carbon ferro-aluminate cement concrete and preparation method of segment made of same Download PDFInfo
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- CN117447167A CN117447167A CN202311406774.XA CN202311406774A CN117447167A CN 117447167 A CN117447167 A CN 117447167A CN 202311406774 A CN202311406774 A CN 202311406774A CN 117447167 A CN117447167 A CN 117447167A
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- 239000004567 concrete Substances 0.000 title claims abstract description 170
- 239000004568 cement Substances 0.000 title claims abstract description 96
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000000835 fiber Substances 0.000 claims abstract description 54
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 238000005507 spraying Methods 0.000 claims abstract description 22
- 238000005260 corrosion Methods 0.000 claims abstract description 20
- 230000007797 corrosion Effects 0.000 claims abstract description 20
- 239000012779 reinforcing material Substances 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims description 94
- 239000000843 powder Substances 0.000 claims description 70
- 229910000831 Steel Inorganic materials 0.000 claims description 68
- 239000010959 steel Substances 0.000 claims description 68
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 38
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 35
- 229910052744 lithium Inorganic materials 0.000 claims description 35
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 30
- 229910052742 iron Inorganic materials 0.000 claims description 25
- 238000001723 curing Methods 0.000 claims description 23
- 229910052934 alunite Inorganic materials 0.000 claims description 22
- 239000010424 alunite Substances 0.000 claims description 22
- -1 iron aluminate Chemical class 0.000 claims description 22
- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 claims description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 21
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 18
- 239000011707 mineral Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 18
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 17
- 239000001569 carbon dioxide Substances 0.000 claims description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 15
- 238000003763 carbonization Methods 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 15
- 238000007790 scraping Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 15
- 239000004743 Polypropylene Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 13
- 229920001155 polypropylene Polymers 0.000 claims description 13
- 229910021487 silica fume Inorganic materials 0.000 claims description 12
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 12
- 229920001353 Dextrin Polymers 0.000 claims description 11
- 239000004375 Dextrin Substances 0.000 claims description 11
- 239000002956 ash Substances 0.000 claims description 11
- 235000019425 dextrin Nutrition 0.000 claims description 11
- 229910052602 gypsum Inorganic materials 0.000 claims description 11
- 239000010440 gypsum Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 229920000742 Cotton Polymers 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 10
- 238000007667 floating Methods 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 10
- 239000002985 plastic film Substances 0.000 claims description 10
- 229920006255 plastic film Polymers 0.000 claims description 10
- 239000004575 stone Substances 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 9
- 239000011800 void material Substances 0.000 claims description 8
- 230000001788 irregular Effects 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical compound O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 claims description 5
- 238000004438 BET method Methods 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 5
- 229920000858 Cyclodextrin Polymers 0.000 claims description 5
- 239000001116 FEMA 4028 Substances 0.000 claims description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 5
- 229920000877 Melamine resin Polymers 0.000 claims description 5
- 229910000746 Structural steel Inorganic materials 0.000 claims description 5
- QUWBSOKSBWAQER-UHFFFAOYSA-N [C].O=C=O Chemical compound [C].O=C=O QUWBSOKSBWAQER-UHFFFAOYSA-N 0.000 claims description 5
- 229910052925 anhydrite Inorganic materials 0.000 claims description 5
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 claims description 5
- 235000011175 beta-cyclodextrine Nutrition 0.000 claims description 5
- 229960004853 betadex Drugs 0.000 claims description 5
- 235000012241 calcium silicate Nutrition 0.000 claims description 5
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical group [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 239000003814 drug Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 238000007373 indentation Methods 0.000 claims description 5
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 5
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 5
- 229910001947 lithium oxide Inorganic materials 0.000 claims description 5
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 5
- 239000006082 mold release agent Substances 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 239000006104 solid solution Substances 0.000 claims description 5
- 239000002918 waste heat Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 8
- 229910010271 silicon carbide Inorganic materials 0.000 claims 2
- 239000003054 catalyst Substances 0.000 claims 1
- 238000013008 moisture curing Methods 0.000 claims 1
- 238000006703 hydration reaction Methods 0.000 abstract description 17
- 230000036571 hydration Effects 0.000 abstract description 13
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 238000011010 flushing procedure Methods 0.000 abstract description 2
- 238000010025 steaming Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000009991 scouring Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000010000 carbonizing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 241000272496 Galliformes Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0254—Hardening in an enclosed space, e.g. in a flexible container
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the field of concrete products, and particularly relates to a long-life low-carbon aluminoferrite cement concrete and a preparation method of a prepared segment. Firstly, spraying an oily release agent on a concrete pipe sheet die in advance for 12 hours, spraying an aqueous release agent after 2 hours interval, putting the aluminoferrite cement, the non-steaming functional material, the corrosion-resistant and wear-resistant reinforcing material, the fiber, the water reducing agent, the fine aggregate, the coarse aggregate and the water into a stirrer according to the formula amount to obtain the aluminoferrite cement concrete for the pipe sheet, pouring the stirred aluminoferrite cement concrete into the die for three times, curing the pipe sheet concrete with curing agent, and finally, demoulding and putting into water for normal-temperature curing. The concrete segment disclosed by the invention has the advantages that the wear resistance of the concrete is improved, the better flushing resistance is given to the segment, the compactness of the segment is increased, the hydration rate of the aluminoferrite cement is regulated and controlled, the compactness of the concrete segment is improved, the corrosion resistance of the concrete is improved, and the durability of the concrete is improved.
Description
Technical Field
The invention belongs to the field of concrete products, and particularly relates to a long-life low-carbon aluminoferrite cement concrete and a preparation method of a segment made of the same.
Background
The ferroaluminate cement concrete has the characteristics of quick setting, quick hardening, early strength, high volume stability, wear resistance, erosion resistance, high service performance and the like, is particularly suitable for ocean engineering, and is successfully applied to engineering fields with special performance requirements such as south pole investigation stations, southeast mountain island seawalls of fowls, national ocean bureau and the like, and the national economic construction requirements are met.
In recent years, with the continuous adjustment of energy structures in China, the proportion of green clean energy sources such as photovoltaic energy, wind power and nuclear power is continuously improved. In order to improve the energy source guaranteeing capability and promote green development, china is planned to continuously push nuclear power engineering to be implemented in a floor mode. The nuclear power station needs cooling water to take away heat, and the ocean is a natural large heat exchange field. The seawater is used as a cooling medium, and the seawater direct current circulation cooling technology is utilized to bring heat to the sea, so that the method is economical and environment-friendly.
The drainage tunnel is a channel for seawater direct current circulation, and a shield construction process is mostly adopted. The scouring and erosion effects of the large-displacement, high-flow-rate and high-low-temperature seawater on the pipe pieces are extremely strong, and the method provides great challenges for the quality of the concrete pipe pieces. Once the durability of the pipe piece is not too closed, the pipe piece is damaged, and the normal operation of nuclear power can be influenced. And the nature of the deep buried underground also determines the complexity and difficulty of its replacement. Therefore, the wear resistance, the scouring resistance and the corrosion resistance of the segment for the nuclear power engineering drainage tunnel are extremely high. Compared with the traditional silicate cement, the iron aluminate cement concrete is more suitable for producing and preparing the segments for the drainage tunnels.
However, because the hydration of the ferroaluminate cement is rapid, the water loss of the concrete surface is too rapid, and in addition, the arc-shaped structure of the duct piece is characterized in that once the surface wet maintenance cannot keep pace, even if the duct piece is subjected to secondary plastering, the upper surface of the duct piece is extremely easy to generate plastic shrinkage cracking. In addition, because hydration heat release is concentrated, the temperature stress is larger in the cooling process, and the temperature cracking is easy to occur. These cracked segments can only be scrapped and cannot be applied to solid structures. And the external erosion medium can enter the concrete along the cracks to destroy the structure. Therefore, although the ferroaluminate cement has good corrosion resistance and scouring resistance, how to prepare the long-life low-carbon ferroaluminate cement concrete segment by using the ferroaluminate cement has a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention mainly aims to provide a long-life low-carbon ferro-aluminate cement concrete and a preparation method of a prepared segment thereof, and aims to solve the technical problems that: on one hand, the surface plastic shrinkage in the preparation process of the aluminoferrite cement concrete pipe sheet and the temperature cracking in the cooling process are eliminated; on the other hand, the preparation of the concrete segment with low carbonization is realized, and the concrete segment is endowed with long-term service capability under a complex environment, so that the sign is matched with the design life of nuclear power engineering.
The specific technical scheme of the invention is as follows:
the long-life low-carbon iron aluminate cement concrete comprises the following components in parts by weight:
iron aluminate cement: 400-450 parts;
steaming-free functional material: 60-90 parts;
corrosion and wear resistant reinforcing material: 40-80 parts;
and (3) fibers: 10 to 25 parts of
Water reducing agent: 2-3 parts;
fine aggregate: 640-700 parts;
coarse aggregate: 950-1040 parts.
Preferably, the ferroaluminate cement is high-iron-phase ferroaluminate cement with the strength grade of more than 42.5MPa, and the Boehringer specific surface area of the ferroaluminate cement is (400+/-20) m 2 /kg; the mineral phase of the cement clinker for preparing the ferroaluminate cement comprises 45.0-55.0% of anhydrous calcium sulfoaluminate, 15.0-25.0% of dicalcium silicate and 30.0-35.0% of iron phase solid solution by weight percentage, and the ferric oxide content of the ferroaluminate cement is 10.0-12.0%. The particle fineness is regulated and controlled physically by regulating and controlling the mineral phase composition of the aluminoferrite cement clinker, so that the hydration rate is optimized, and the hydration temperature rise is about 2 hoursThe highest peak is reached. Meanwhile, the self hydration heat is utilized to cooperate with the steaming-free functional material, so that the rapid construction of the concrete strength is promoted, and the steaming-free and low-carbonization preparation of the concrete segment is realized. In addition, by improving the iron phase content in the clinker, the abrasion resistance of the concrete can be further improved, and the segment is endowed with better scouring resistance.
Preferably, the steaming-free functional material comprises the following components in percentage by weight:
lithium slag powder: 20.0 to 30.0 percent,
fly ash: 30.0 to 40.0 percent,
mineral powder: 20.0 to 30.0 percent,
silica fume: 5.0 to 10.0 percent,
gypsum: 5.0 to 10.0 percent,
dextrin: 0.5%.
The steaming-free functional material has the effects of accelerating hydration of the aluminoferrite cement concrete and generating more hydration heat in a short time. Meanwhile, the self-hydration temperature rise of the concrete is utilized, under the thermal excitation effect, the self-hydration temperature rise of the concrete and the aluminoferrite cement cooperate to promote chemical reaction mutually, and the steam curing-free low-carbonization preparation of the concrete pipe sheet can be realized without external heat source maintenance.
Preferably, the lithium slag powder is carbonized lithium slag micropowder, and the specific surface area (350+/-20) m 2 The preparation process of the carbonization treatment lithium slag micro powder comprises the steps of firstly carrying out carbon dioxide carbonization pretreatment on the water-containing lithium slag, controlling the carbonization time of the material to be 30-50 min, reacting lithium oxide in the lithium slag in the presence of water to generate lithium carbonate, then carrying out drying treatment on the lithium slag by utilizing waste heat of 120-140 ℃, and then carrying out grinding treatment by a ball mill.
Preferably, the fly ash is ground and the performance index accords with the quality of grade II ash, the screen residue of 45 mu m is less than or equal to 3.0 percent, and the ground and the controlled ash mainly breaks up large glass beads in the controlled ash by using a mechanical force effect to release more small beads. On one hand, the workability of the concrete is improved, and on the other hand, the concrete participates in chemical reaction to generate low-calcium C-S-H gel, so that the strength construction of the concrete is quickened.
Preferably, the mineral powder is ground slag powder with specific surface area (650+ -20) m 2 The activity index of the powder is larger than or equal to 105 percent, and the mineral powder is used for cooperatively participating in hydration reaction, so that on one hand, the calcium hydroxide content of the system is increased, on the other hand, more C-S-H gel is generated, the strength of the concrete is increased, the crystal-gel ratio of the concrete is optimized, and the toughness of the concrete segment is improved.
Preferably, the silica fume is powder material mainly comprising amorphous silica obtained by collecting dust discharged from a flue during the smelting of ferrosilicon or industrial silicon and SiO 2 The content is more than or equal to 90.0 percent, and the specific surface area (BET method) is more than or equal to 18m 2 And/g. The main function of the silica fume in the steaming-free functional material is to provide high-activity SiO 2 More C-S-H gel is generated, and meanwhile, the superfine characteristic of the gel is utilized to fill the pores to form close packing, so that the compactness and the impermeability of the duct piece are improved.
Preferably, the gypsum is anhydrite, the performance meets the technical requirements of GB/T5483 Natural gypsum, wherein SO 3 More than or equal to 48 percent, and the content of crystal water is less than or equal to 3.0 percent.
Preferably, the dextrin is beta cyclodextrin, specific optical rotation= + (162±2) °, particle size distribution: 20.0-30.0 mu m. The dextrin has the function of synergism with the lithium slag powder, regulates and controls the hydration rate of the aluminoferrite cement, ensures the workability of the concrete within 30min, and meets the pouring requirement.
Preferably, the corrosion and wear resistant reinforcing material comprises, in weight percent:
slag powder: 30.0 to 40.0 percent,
alunite is used for preparing the medicine: 40.0 to 60.0 percent,
silicon carbide powder: 10.0 to 20.0 percent.
The corrosion-resistant and wear-resistant reinforcing material has the function of increasing the compactness and wear resistance of the concrete segment, thereby improving the anti-scouring and anti-erosion performance of the concrete segment.
Preferably, the steel slag powder is steel slag micro powder prepared by grinding carbon dioxide gas-cooled steel slag, and D is 50 Less than or equal to 5.0 mu m, wherein the Bo specific surface area is (680+/-20) m 2 Per kg, the iron oxide content is more than or equal to 30 percent, the weight ratio of f-CaO is 2.5 to 4.0 percent, the weight ratio of f-MgO is 2.0 to 4.0 percent after the steel slag powder is cooled by carbon dioxide gas, and the steel slag micro powder is prepared by the following steps ofThe effect of increasing the wear resistance and the compactness of the concrete is achieved. On one hand, the iron oxide content in the steel slag micro powder is higher, and the steel slag micro powder has good wear resistance, so that the wear resistance of the iron aluminate cement concrete segment can be improved. On the other hand, the carbon dioxide gas-cooled steel slag contains a certain content of f-CaO and f-MgO, the expansive products generated by hydration of the steel slag can further fill the internal pores of the compact concrete, the macropores become smaller, and the pore structure is optimized, so that the compactness of the concrete segment is improved, and the corrosion resistance of the concrete is optimized.
Preferably, the alunite is ground alunite, the content of pure alunite is more than or equal to 70%, the potassium-sodium ratio is more than or equal to 5.5, and the specific surface area is (350+/-20) m 2 The alunite acts on the continuous hydration reaction to generate the expansive hydration product ettringite, and the in-situ filling of the dense reinforced concrete is equivalent to a long-term self-repairing material, so that the concrete pipe sheet is in a micro-expansion state.
Preferably, the silicon carbide powder is ground silicon carbide powder, the fineness of the silicon carbide powder is 45 mu m, the screen residue is less than or equal to 15.0%, and the silicon carbide powder and the steel slag powder are overlapped to enhance the wear resistance of the concrete.
Preferably, the fiber is a mixed fiber composed of steel fiber and polypropylene fiber, the weight percentage of the steel fiber is 85.0-95.0%, the weight percentage of the PVC fiber is 5.0-15.0%, the steel fiber is alloy structural steel, the appearance is longitudinal straight, hooks are arranged at two ends, fine indentation is arranged on the surface, and the nominal length is less than or equal to 20mm of the 700-grade steel fiber, which has the function of macroscopically increasing the tensile strength and the impact resistance of the concrete. The length of the polypropylene fiber is less than or equal to 15mm, the equivalent diameter is 30 mu m, the polypropylene fiber mainly plays a role of micro toughening, and cooperates with the steel fiber to increase the toughness of the concrete pipe sheet from micro and macro multi-layer levels, and on the other hand, the plastic shrinkage cracking in the pipe sheet preparation process is reduced. Meanwhile, when the duct piece is subjected to external load, the steel fibers and the polypropylene fibers can play roles in distributing stress and reducing crack width.
Preferably, the water reducer is a polycarboxylic acid and melamine composite high-performance powdery water reducer, the weight percentage of the polycarboxylic acid water reducer is 50.0-75.0%, the weight percentage of the melamine water reducer is 25.0-50.0%, and the water reducing rate is more than or equal to 25%. The water reducing agent has the functions of reducing the unilateral water consumption of the concrete, reducing capillary holes and improving the compactness and impermeability of the concrete, thereby improving the corrosion resistance and wear resistance of the concrete pipe.
Preferably, the fine aggregate is a mixture of machine-made sand and carbonized steel slag, the weight percentage of the machine-made sand is 60.0-75.0%, and the weight percentage of the steel slag is 25.0-40.0%. The specific granularity of the machine-made sand is 5.0-6.0, the MB value is less than or equal to 1.0, the stone powder content is less than or equal to 10.0%, and the flaky particle content is less than or equal to 5.0%. The carbonized steel slag is steel slag which is treated by carbon dioxide carbon fixation, the problem of poor stability is eliminated, the grain diameter range is 2.5-5 mm, and Fe 2 O 3 The content is more than or equal to 30 percent. Because the sphericity of the steel slag particles is higher, the steel slag particles are introduced as fine aggregate, so that the fluidity of concrete can be greatly improved, the unilateral water consumption can be reduced, and the durability of the concrete pipe sheet can be improved.
Preferably, the coarse aggregate is at least one of shaping artificial fine crushed stone, double-graded aggregate, triple-graded aggregate or multi-graded aggregate, the maximum grain diameter is less than or equal to 25.0mm, the close-packed void ratio is 35.0-37.0%, and the irregular grain content is less than or equal to 3.0%. The aggregate void ratio can be minimized through multistage aggregate preparation, irregular particles are controlled, the mortar quantity required for filling the aggregate void can be reduced to the greatest extent, the fluidity is ensured, the compactness of the concrete is improved, and the durability of the concrete is improved.
A preparation method of a long-life low-carbon iron aluminate cement concrete prepared segment comprises the following steps:
(1) And (3) coating a mold release agent on the mold: spraying an oily release agent in advance for 12 hours, and then spraying an aqueous release agent after 2 hours apart;
(2) And (3) concrete stirring preparation: filling the segment-used ferroaluminate cement concrete dry blend into a concrete transportation mixer truck, adding water according to the formula amount, firstly stirring for 240-300 s at a slow speed, then stirring for 60-90 s at a fast speed, and standing for 120s to obtain segment-used ferroaluminate cement concrete, wherein the slump of the concrete outlet is controlled at 140-180 mm;
(3) And (3) pouring duct piece concrete: pouring the stirred ferroaluminate cement concrete into a mould for three times, pouring one third of the thickness of the pipe piece in the first layer, vibrating for 180 seconds by vibrating air pressure of 0.80-0.85 MPa, and scraping off surface floating paste; pouring the second layer to the thickness of two thirds of the duct piece, vibrating for 120s by using vibrating air pressure of 0.90-0.95 MPa, and scraping off surface floating slurry; pouring the third layer to the top of the duct piece, vibrating for 100s by using vibrating air pressure of 0.95-1.00 MPa, and scraping off superfluous concrete on the surface; simultaneously pouring a reduced-size test piece, and embedding a temperature sensor in the test piece for determining demolding time;
(4) And (3) curing duct piece concrete: spraying a layer of concrete curing agent on the surface of the concrete, covering a layer of plastic film, uncovering the film after 30min, and checking whether the concrete is close to initial setting. If the initial setting is close, performing secondary wiping and pressing, then spraying water for moisture preservation and curing, covering a plastic film, and covering a cotton quilt on the film for heat preservation and curing;
(5) And (3) demolding the duct piece: when the temperature in the reduced-size test piece is reduced to below 40 ℃ and the temperature difference between the internal environment and the external environment is lower than 20 ℃, the cotton quilt and the film can be removed in sequence, the mould is loosened, then the pipe piece is lifted out of the mould by the sucker, and the pipe piece is put into water for normal-temperature maintenance.
Preferably, the first oily release agent in the step (1) is used for protecting the segment mold and eliminating the problem of mold rust easily caused by the aluminoferrite cement concrete; the second aqueous release agent is used for reducing the surface tension of the concrete, eliminating air holes on the surface of the concrete and improving the surface compactness, thereby improving the surface wear resistance of the concrete pipe sheet.
Preferably, the water consumption of the single concrete in the step (2) is 150-160 kg.
Preferably, the dosage of the concrete curing agent in the step (4) is 0.15-0.20 kg/m 2 。
The invention has the following advantages due to the adoption of the technical scheme:
1. the self hydration heat of the aluminoferrite cement is utilized to cooperate with the steaming-free functional material, so that the rapid construction of the concrete strength is promoted, and the steaming-free and low-carbonization preparation of the concrete segment is realized. Meanwhile, the iron phase content in the cement clinker is improved, the wear resistance of the concrete is further improved, and the segment is endowed with better flushing resistance.
2. By introducing mineral powder, the workability of the concrete is improved, and the concrete is acceleratedAnd (3) constructing the strength, increasing the calcium hydroxide content of the system, optimizing the crystal-cement ratio of the concrete, and improving the toughness of the concrete segment. At the same time, high activity SiO is provided by using silica fume 2 More C-S-H gel is generated, and meanwhile, the superfine characteristic of the gel is utilized to fill pores to form close packing, so that the compactness of the duct piece is increased, the hydration rate of the aluminoferrite cement is regulated and controlled, the workability of the concrete within 30min is ensured, and the pouring requirement is met.
3. By introducing the corrosion-resistant and wear-resistant reinforcing material, the wear resistance of the aluminoferrite cement concrete is improved, the compactness of the concrete segment is improved, and the corrosion resistance of the concrete is improved. The alunite in-situ filling compact reinforced concrete is equivalent to a long-term self-repairing material, so that the concrete pipe sheet is in a micro-expansion state. The toughness of the concrete pipe sheet is increased from microscopic and macroscopic multilayer levels by the steel fiber and the polypropylene fiber, and the plastic shrinkage cracking of the surface in the pipe sheet preparation process is reduced; the concrete compactness and the impermeability are improved by reducing the unilateral water consumption of the concrete and the capillary holes, so that the corrosion resistance and the wear resistance of the concrete pipe sheet are improved; the aggregate void ratio can be minimized through multistage aggregate preparation, irregular particles are controlled, mortar quantity required by filling aggregate and guaranteeing fluidity can be reduced to the greatest extent, the compactness of concrete is further improved, and the durability of the concrete is improved.
The foregoing description is only an overview of the present invention, and is intended to provide a more thorough understanding of the present invention, and is to be accorded the full scope of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention to achieve the preset purpose, the following detailed description is given of a concrete implementation of a long-life low-carbon ferroaluminate cement concrete according to the present invention in combination with the preferred embodiments. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
Example 1
The long-life low-carbon iron aluminate cement concrete comprises the following components in parts by weight:
iron aluminate cement: 400 parts;
steaming-free functional material: 60 parts;
corrosion and wear resistant reinforcing material: 40 parts;
and (3) fibers: 10 parts of
Water reducing agent: 2 parts;
fine aggregate: 700 parts;
coarse aggregate: 1040 parts.
The ferroaluminate cement is high-iron-phase ferroaluminate cement with the strength grade of more than 42.5MPa, and the Boehringer specific surface area of the ferroaluminate cement is (400+/-20) m 2 /kg; the mineral phase of the cement clinker for preparing the ferroaluminate cement comprises 45.0-55.0% of anhydrous calcium sulfoaluminate, 15.0-25.0% of dicalcium silicate and 30.0-35.0% of iron phase solid solution by weight percentage, and the ferric oxide content of the ferroaluminate cement is 10.0-12.0%.
The steaming-free functional material comprises the following components in percentage by weight:
lithium slag powder: 20.0 percent,
fly ash: 30.0 percent,
mineral powder: 30.0 percent,
silica fume: 10.0 percent,
gypsum: 9.5 percent,
dextrin: 0.5%.
The lithium slag powder is carbonized lithium slag micropowder, and has specific surface area (350+ -20) m 2 The preparation process of the carbonization treatment lithium slag micro powder comprises the steps of firstly carrying out carbon dioxide carbonization pretreatment on water-containing lithium slag, controlling the material carbonization time to be 30min, reacting lithium oxide in the lithium slag in the presence of water to generate lithium carbonate, then carrying out drying treatment on the lithium slag by utilizing waste heat of 140 ℃, and then carrying out grinding treatment by a ball mill.
The fly ash is ground and is ash, the performance index accords with the quality of grade II ash, and the screen residue of 45 mu m is less than or equal to 3.0 percent.
The mineral powder is ground slag powder, and has specific surface area (650+ -20) m 2 The activity index per kg and 28d is more than or equal to 105 percent.
The silica fume is dust discharged from flue during smelting ferrosilicon or industrial silicon, and is collected to obtain the productPowder material with shaped silicon dioxide as main component, siO 2 The content is more than or equal to 90.0 percent, and the specific surface area (BET method) is more than or equal to 18m 2 /g。
The gypsum is anhydrite, wherein SO 3 More than or equal to 48 percent, and the content of crystal water is less than or equal to 3.0 percent.
The dextrin is beta cyclodextrin, the specific optical rotation is = + (162+/2) °, and the particle size distribution is as follows: 20.0-30.0 mu m.
The corrosion and wear resistant reinforcing material comprises the following components in percentage by weight:
slag powder: 30.0 percent,
alunite is used for preparing the medicine: 60.0 percent,
silicon carbide powder: 10.0%.
The steel slag powder is steel slag micro powder prepared by grinding carbon dioxide gas-cooled steel slag, and D is 50 Less than or equal to 5.0 mu m, wherein the Bo specific surface area is (680+/-20) m 2 Per kg, the iron oxide content is more than or equal to 30 percent, the weight ratio of f-CaO is 2.5 to 4.0 percent, and the weight ratio of f-MgO is 2.0 to 4.0 percent after the steel slag powder is cooled by carbon dioxide gas.
The alunite is ground alunite, the content of pure alunite is more than or equal to 70%, the potassium-sodium ratio is more than or equal to 5.5, and the specific surface area is (350+/-20) m 2 /kg。
The silicon carbide powder is ground diamond powder, and the screen residue with the fineness of 45 mu m is less than or equal to 15.0 percent.
The fiber is a mixed fiber composed of steel fiber and polypropylene fiber, the weight percentage of the steel fiber is 85.0 percent, the PVC fiber is 15.0 percent, the steel fiber is alloy structural steel, the appearance is longitudinal straight, hooks are arranged at the two ends, fine indentations are arranged on the surface, and the nominal length is less than or equal to 20 mm. The length of the polypropylene fiber is less than or equal to 15mm, and the equivalent diameter is 30 mu m.
The water reducer is a polycarboxylic acid and melamine composite high-performance powdery water reducer, the weight percentage of the polycarboxylic acid water reducer is 50.0-75.0%, the weight percentage of the melamine water reducer is 25.0-50.0%, and the water reducing rate is more than or equal to 25%.
The fine aggregate is a mixture of machine-made sand and carbonized steel slag, and the weight percentage of the machine-made sand is 60.0 percent, and the weight percentage of the steel slag is 40.0 percent. The specific granularity of the machine-made sand is 5.0-6.0, the MB value is less than or equal to 1.0, the stone powder content is less than or equal to 10.0%, and the flaky particle content is less than or equal to 5.0%. Carbonized steelThe slag is steel slag which is treated by carbon dioxide carbon fixation, the problem of poor stability is eliminated, the grain diameter range is 2.5-5 mm, and Fe 2 O 3 The content is more than or equal to 30 percent.
The coarse aggregate is shaped artificial fine crushed stone, the maximum grain diameter is less than or equal to 25.0mm, the close-packed void ratio is 35.0-37.0%, and the irregular grain content is less than or equal to 3.0%.
A preparation method of a long-life low-carbon iron aluminate cement concrete prepared segment comprises the following steps:
(1) And (3) coating a mold release agent on the mold: spraying an oily release agent in advance for 12 hours, and then spraying an aqueous release agent after 2 hours apart;
(2) And (3) concrete stirring preparation: filling the segment-used ferroaluminate cement concrete dry blend into a concrete transportation mixer truck, wherein the water consumption of single concrete is 150kg, firstly stirring for 240s at a low speed, then stirring for 90s at a high speed, and standing for 120s to obtain segment-used ferroaluminate cement concrete, wherein the slump of the concrete outlet is controlled to be 140-180 mm;
(3) And (3) pouring duct piece concrete: pouring the stirred ferroaluminate cement concrete into a mould for three times, pouring one third of the thickness of the pipe piece in the first layer, vibrating for 180 seconds by vibrating air pressure of 0.80-0.85 MPa, and scraping off surface floating paste; pouring the second layer to the thickness of two thirds of the duct piece, vibrating for 120s by using vibrating air pressure of 0.90-0.95 MPa, and scraping off surface floating slurry; pouring the third layer to the top of the duct piece, vibrating for 100s by using vibrating air pressure of 0.95-1.00 MPa, and scraping off superfluous concrete on the surface; simultaneously pouring a reduced-size test piece, and embedding a temperature sensor in the test piece for determining demolding time;
(4) And (3) curing duct piece concrete: spraying a layer of concrete curing agent on the surface of the concrete, wherein the dosage of the concrete curing agent is 0.15kg/m 2 Covering a layer of plastic film, uncovering the film after 30min, checking whether the concrete is close to initial setting, if so, performing secondary plastering and pressing, then spraying water for moisture preservation and curing, covering the plastic film, and covering a cotton quilt on the film for heat preservation and curing;
(5) And (3) demolding the duct piece: when the temperature in the reduced-size test piece is reduced to below 40 ℃ and the temperature difference between the internal environment and the external environment is lower than 20 ℃, the cotton quilt and the film can be removed in sequence, the mould is loosened, then the pipe piece is lifted out of the mould by the sucker, and the pipe piece is put into water for normal-temperature maintenance.
Example 2
The long-life low-carbon iron aluminate cement concrete comprises the following components in parts by weight:
iron aluminate cement: 450 parts;
steaming-free functional material: 90 parts;
corrosion and wear resistant reinforcing material: 80 parts;
and (3) fibers: 25 parts of
Water reducing agent: 3 parts;
fine aggregate: 640 parts;
coarse aggregate: 950 parts.
The ferroaluminate cement is high-iron-phase ferroaluminate cement with the strength grade of more than 42.5MPa, and the Boehringer specific surface area of the ferroaluminate cement is (400+/-20) m 2 /kg; the mineral phase of the cement clinker for preparing the ferroaluminate cement comprises 45.0-55.0% of anhydrous calcium sulfoaluminate, 15.0-25.0% of dicalcium silicate and 30.0-35.0% of iron phase solid solution by weight percentage, and the ferric oxide content of the ferroaluminate cement is 10.0-12.0%.
The steaming-free functional material comprises the following components in percentage by weight:
lithium slag powder: 25.0 percent,
fly ash: 40.0 percent,
mineral powder: 25.0 percent,
silica fume: 5.0 percent,
gypsum: 4.5 percent,
dextrin: 0.5%.
The lithium slag powder is carbonized lithium slag micropowder, and has specific surface area (350+ -20) m 2 The preparation process of the carbonization treatment lithium slag micro powder comprises the steps of firstly carrying out carbon dioxide carbonization pretreatment on water-containing lithium slag, controlling the material carbonization time to be 35min, reacting lithium oxide in the lithium slag in the presence of water to generate lithium carbonate, then carrying out drying treatment on the lithium slag by utilizing waste heat at 120 ℃, and then carrying out grinding treatment by a ball mill.
The fly ash is ground and is ash, the performance index accords with the quality of grade II ash, and the screen residue of 45 mu m is less than or equal to 3.0 percent.
The mineral powder is ground slag powder, and has specific surface area (650+ -20) m 2 The activity index per kg and 28d is more than or equal to 105 percent.
The silica fume is powder material mainly comprising amorphous silica and is obtained by collecting dust discharged from flue during smelting ferrosilicon or industrial silicon 2 The content is more than or equal to 90.0 percent, and the specific surface area (BET method) is more than or equal to 18m 2 /g。
The gypsum is anhydrite, wherein SO 3 More than or equal to 48 percent, and the content of crystal water is less than or equal to 3.0 percent.
The dextrin is beta cyclodextrin, the specific optical rotation is = + (162+/2) °, and the particle size distribution is as follows: 20.0-30.0 mu m.
The corrosion and wear resistant reinforcing material comprises the following components in percentage by weight:
slag powder: 40.0 percent,
alunite is used for preparing the medicine: 40.0 percent,
silicon carbide powder: 20.0%.
The steel slag powder is steel slag micro powder prepared by grinding carbon dioxide gas-cooled steel slag, and D is 50 Less than or equal to 5.0 mu m, wherein the Bo specific surface area is (680+/-20) m 2 Per kg, the iron oxide content is more than or equal to 30 percent, the weight ratio of f-CaO is 2.5 to 4.0 percent, and the weight ratio of f-MgO is 2.0 to 4.0 percent after the steel slag powder is cooled by carbon dioxide gas.
The alunite is ground alunite, the content of pure alunite is more than or equal to 70%, the potassium-sodium ratio is more than or equal to 5.5, and the specific surface area is (350+/-20) m 2 /kg。
The silicon carbide powder is ground diamond powder, and the screen residue with the fineness of 45 mu m is less than or equal to 15.0 percent.
The fiber is a mixed fiber composed of steel fiber and polypropylene fiber, the weight percentage of the steel fiber is 85.0%, and the weight percentage of the PVC fiber is 15.0%. The steel fiber is alloy structural steel, the appearance is 700 grade steel fiber which is longitudinally straight and has hooks at two ends, fine indentations are formed on the surface, and the nominal length is less than or equal to 20 mm. The length of the polypropylene fiber is less than or equal to 15mm, and the equivalent diameter is 30 mu m.
The water reducer is a polycarboxylic acid and melamine composite high-performance powdery water reducer, the weight percentage of the polycarboxylic acid water reducer is 50.0-75.0%, the weight percentage of the melamine water reducer is 25.0-50.0%, and the water reducing rate is more than or equal to 25%.
The fine aggregate is a mixture of machine-made sand and carbonized steel slag, and the weight percentage of the machine-made sand is 70.0 percent, and the weight percentage of the steel slag is 30.0 percent. The specific granularity of the machine-made sand is 5.0-6.0, the MB value is less than or equal to 1.0, the stone powder content is less than or equal to 10.0%, and the flaky particle content is less than or equal to 5.0%. The carbonized steel slag is steel slag which is treated by carbon dioxide carbon fixation, the problem of poor stability is eliminated, the grain diameter range is 2.5-5 mm, and Fe 2 O 3 The content is more than or equal to 30 percent.
The coarse aggregate is shaped artificial fine crushed stone, three-stage grading is carried out, the maximum particle size is less than or equal to 25.0mm, the close-packed void ratio is 35.0-37.0%, and the irregular particle content is less than or equal to 3.0%.
A preparation method of a long-life low-carbon iron aluminate cement concrete prepared segment comprises the following steps:
(1) And (3) coating a mold release agent on the mold: spraying an oily release agent in advance for 12 hours, and then spraying an aqueous release agent after 2 hours apart;
(2) And (3) concrete stirring preparation: filling the segment-used ferroaluminate cement concrete dry blend into a concrete transportation mixer truck, wherein the water consumption of single concrete is 160kg, firstly stirring slowly for 300s, then stirring rapidly for 60s, and standing for 120s to obtain segment-used ferroaluminate cement concrete, wherein the slump of the concrete outlet is controlled to be 140-180 mm;
(3) And (3) pouring duct piece concrete: pouring the stirred ferroaluminate cement concrete into a mould for three times, pouring one third of the thickness of the pipe piece in the first layer, vibrating for 180 seconds by vibrating air pressure of 0.80-0.85 MPa, and scraping off surface floating paste; pouring the second layer to the thickness of two thirds of the duct piece, vibrating for 120s by using vibrating air pressure of 0.90-0.95 MPa, and scraping off surface floating slurry; pouring the third layer to the top of the duct piece, vibrating for 100s by using vibrating air pressure of 0.95-1.00 MPa, and scraping off superfluous concrete on the surface; simultaneously pouring a reduced-size test piece, and embedding a temperature sensor in the test piece for determining demolding time;
(4) And (3) curing duct piece concrete: spraying a layer of concrete curing agent on the surface of the concrete, wherein the dosage of the concrete curing agent is 0.20kg/m 2 Covering a layer of plastic film, uncovering the film after 30min, and checkingWhether the concrete is close to the initial setting or not, if so, performing secondary plastering and pressing, then spraying water for moisturizing and curing, covering a plastic film, and covering a cotton quilt on the film for moisturizing and curing;
(5) And (3) demolding the duct piece: when the temperature in the reduced-size test piece is reduced to below 40 ℃ and the temperature difference between the internal environment and the external environment is lower than 20 ℃, the cotton quilt and the film can be removed in sequence, the mould is loosened, then the pipe piece is lifted out of the mould by the sucker, and the pipe piece is put into water for normal-temperature maintenance.
Example 3
The long-life low-carbon iron aluminate cement concrete comprises the following components in parts by weight:
iron aluminate cement: 420 parts;
steaming-free functional material: 75 parts;
corrosion and wear resistant reinforcing material: 60 parts;
and (3) fibers: 17.5 parts
Water reducing agent: 2.5 parts;
fine aggregate: 670 parts;
coarse aggregate: 1000 parts.
The ferroaluminate cement is high-iron-phase ferroaluminate cement with the strength grade of more than 42.5MPa, and the Boehringer specific surface area of the ferroaluminate cement is (400+/-20) m 2 /kg; the mineral phase of the cement clinker for preparing the ferroaluminate cement comprises 45.0-55.0% of anhydrous calcium sulfoaluminate, 15.0-25.0% of dicalcium silicate and 30.0-35.0% of iron phase solid solution by weight percentage, and the ferric oxide content of the ferroaluminate cement is 10.0-12.0%.
The steaming-free functional material comprises the following components in percentage by weight:
lithium slag powder: 30.0 percent,
fly ash: 30.0 percent,
mineral powder: 25.0 percent,
silica fume: 5.0 percent,
gypsum: 9.5 percent,
dextrin: 0.5%.
The lithium slag powder is carbonized lithium slag micropowder, and has specific surface area (350+ -20) m 2 The preparation process of the carbonized lithium slag micropowder comprises the steps of firstly carrying out dioxygen treatment on the water-containing lithium slagAnd (3) carbonizing pretreatment, wherein the carbonizing time of the material is controlled at 40min, lithium oxide in lithium slag reacts in the presence of water to generate lithium carbonate, and then the lithium slag is dried by using waste heat of 130 ℃ and ground by a ball mill.
The fly ash is ground and is ash, the performance index accords with the quality of grade II ash, and the screen residue of 45 mu m is less than or equal to 3.0 percent.
The mineral powder is ground slag powder, and has specific surface area (650+ -20) m 2 The activity index per kg and 28d is more than or equal to 105 percent.
The silica fume is powder material mainly comprising amorphous silica and is obtained by collecting dust discharged from flue during smelting ferrosilicon or industrial silicon 2 The content is more than or equal to 90.0 percent, and the specific surface area (BET method) is more than or equal to 18m 2 /g。
The gypsum is anhydrite, wherein SO 3 More than or equal to 48 percent, and the content of crystal water is less than or equal to 3.0 percent.
The dextrin is beta cyclodextrin, the specific optical rotation is = + (162+/2) °, and the particle size distribution is as follows: 20.0-30.0 mu m.
The corrosion and wear resistant reinforcing material comprises the following components in percentage by weight:
slag powder: 35.0 percent,
alunite is used for preparing the medicine: 50.0 percent,
silicon carbide powder: 15.0%.
The steel slag powder is steel slag micro powder prepared by grinding carbon dioxide gas-cooled steel slag, and D is 50 Less than or equal to 5.0 mu m, wherein the Bo specific surface area is (680+/-20) m 2 Per kg, the iron oxide content is more than or equal to 30 percent, the weight ratio of f-CaO is 2.5 to 4.0 percent, and the weight ratio of f-MgO is 2.0 to 4.0 percent after the steel slag powder is cooled by carbon dioxide gas.
The alunite is ground alunite, the content of pure alunite is more than or equal to 70%, the potassium-sodium ratio is more than or equal to 5.5, and the specific surface area is (350+/-20) m 2 /kg。
The silicon carbide powder is ground diamond powder, and the screen residue with the fineness of 45 mu m is less than or equal to 15.0 percent.
The fiber is a mixed fiber composed of steel fiber and polypropylene fiber, the weight percentage of the steel fiber is 85.0 percent, the PVC fiber is 15.0 percent, the steel fiber is alloy structural steel, the appearance is longitudinal straight, hooks are arranged at the two ends, fine indentations are arranged on the surface, and the nominal length is less than or equal to 20 mm. The length of the polypropylene fiber is less than or equal to 15mm, and the equivalent diameter is 30 mu m.
The water reducer is a polycarboxylic acid and melamine composite high-performance powdery water reducer, the weight percentage of the polycarboxylic acid water reducer is 50.0-75.0%, the weight percentage of the melamine water reducer is 25.0-50.0%, and the water reducing rate is more than or equal to 25%.
The fine aggregate is a mixture of machine-made sand and carbonized steel slag, and the weight percentage of the machine-made sand is 75.0 percent, and the weight percentage of the steel slag is 25.0 percent. The specific granularity of the machine-made sand is 5.0-6.0, the MB value is less than or equal to 1.0, the stone powder content is less than or equal to 10.0%, and the flaky particle content is less than or equal to 5.0%. The carbonized steel slag is steel slag which is treated by carbon dioxide carbon fixation, the problem of poor stability is eliminated, the grain diameter range is 2.5-5 mm, and Fe 2 O 3 The content is more than or equal to 30 percent.
The coarse aggregate is shaped artificial fine crushed stone, the maximum grain diameter is less than or equal to 25.0mm, the close-packed void ratio is 35.0-37.0%, and the irregular grain content is less than or equal to 3.0%.
A preparation method of a long-life low-carbon iron aluminate cement concrete prepared segment comprises the following steps:
(1) And (3) coating a mold release agent on the mold: spraying an oily release agent in advance for 12 hours, and then spraying an aqueous release agent after 2 hours apart;
(2) And (3) concrete stirring preparation: filling the segment-used ferroaluminate cement concrete dry blend into a concrete transportation mixer truck, wherein the water consumption of single concrete is 155kg, firstly stirring slowly for 270s, then stirring rapidly for 75s, and standing for 120s to obtain segment-used ferroaluminate cement concrete, wherein the slump of the concrete outlet is controlled to be 140-180 mm;
(3) And (3) pouring duct piece concrete: pouring the stirred ferroaluminate cement concrete into a mould for three times, pouring one third of the thickness of the pipe piece in the first layer, vibrating for 180 seconds by vibrating air pressure of 0.80-0.85 MPa, and scraping off surface floating paste; pouring the second layer to the thickness of two thirds of the duct piece, vibrating for 120s by using vibrating air pressure of 0.90-0.95 MPa, and scraping off surface floating slurry; pouring the third layer to the top of the duct piece, vibrating for 100s by using vibrating air pressure of 0.95-1.00 MPa, and scraping off superfluous concrete on the surface; simultaneously pouring a reduced-size test piece, and embedding a temperature sensor in the test piece for determining demolding time;
(4) And (3) curing duct piece concrete: spraying a layer of concrete curing agent on the surface of the concrete, wherein the dosage of the concrete curing agent is 0.18kg/m 2 Covering a layer of plastic film, uncovering the film after 30min, checking whether the concrete is close to initial setting, if so, performing secondary plastering and pressing, then spraying water for moisture preservation and curing, covering the plastic film, and covering a cotton quilt on the film for heat preservation and curing;
(5) And (3) demolding the duct piece: when the temperature in the reduced-size test piece is reduced to below 40 ℃ and the temperature difference between the internal environment and the external environment is lower than 20 ℃, the cotton quilt and the film can be removed in sequence, the mould is loosened, then the pipe piece is lifted out of the mould by the sucker, and the pipe piece is put into water for normal-temperature maintenance.
According to GB/T22082-2017 prefabricated concrete lining segment and GB/T50082-2009 common concrete long-term performance and durability test method standard, performance test is carried out on the long-service-life low-carbon ferro-aluminate cement concrete segment, the demolding strength is 40.0-45.0 MPa, the 28d compressive strength is 59.5-64.0 MPa, the impervious grade is P20-P25, and the 28d electric flux is 600-750 ℃, and the segment surface has no penetrating crack and non-penetrating crack and no loose slag inclusion.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The long-life low-carbon ferroaluminate cement concrete is characterized by comprising the following components in parts by weight:
iron aluminate cement: 400-450 parts;
steaming-free functional material: 60-90 parts;
corrosion and wear resistant reinforcing material: 40-80 parts;
and (3) fibers: 10 to 25 parts of
Water reducing agent: 2-3 parts;
fine aggregate: 640-700 parts;
coarse aggregate: 950-1040 parts.
2. The long-life low carbon aluminoferrite cement concrete according to claim 1, characterized in that: the said iron aluminate cement is high iron phase iron aluminate cement with strength grade over 42.5MPa and Bo's specific surface area of (400+ -20) m 2 /kg; the cement clinker mineral phase for preparing the ferroaluminate cement comprises 45.0-55.0% of anhydrous calcium sulfoaluminate, 15.0-25.0% of dicalcium silicate and 30.0-35.0% of iron phase solid solution by weight percentage, wherein the ferric oxide content of the ferroaluminate cement is 10.0-12.0%.
3. The long-life low carbon aluminoferrite cement concrete according to claim 1, characterized in that: the steaming-free functional material comprises the following components in percentage by weight:
lithium slag powder: 20.0 to 30.0 percent,
fly ash: 30.0 to 40.0 percent,
mineral powder: 20.0 to 30.0 percent,
silica fume: 5.0 to 10.0 percent,
gypsum: 5.0 to 10.0 percent,
dextrin: 0.5%.
4. A long life low carbon aluminoferrite cement concrete as claimed in claim 3, characterized in that: the lithium slag powder is carbonized lithium slag micropowder, and has specific surface area (350+/-20) m 2 Firstly, carrying out carbon dioxide carbonization pretreatment on water-containing lithium slag, controlling the carbonization time of the material to be 30-50 min, reacting lithium oxide in the lithium slag in the presence of water to generate lithium carbonate, then, drying the lithium slag by using waste heat of 120-140 ℃, and then, carrying out grinding treatment by a ball mill; the fly ash is ground and is subjected to ash control, the performance index accords with the quality of grade II ash, and the screen residue of 45 mu m is less than or equal to 3.0 percent; the mineral powder is ground slag powder, and has a specific surface area (650+ -20) m 2 The activity index of the catalyst is greater than or equal to 105 percent per kg and 28 d; the silica fume is discharged through a flue when ferrosilicon alloy or industrial silicon is smeltedPowder material containing amorphous silica as main component, siO 2 The content is more than or equal to 90.0 percent, and the specific surface area (BET method) is more than or equal to 18m 2 /g; the gypsum is anhydrite, wherein SO 3 More than or equal to 48 percent, and the content of crystal water is less than or equal to 3.0 percent; the dextrin is beta cyclodextrin, the specific optical rotation= + (162+/-2) degree, and the particle size distribution is as follows: 20.0-30.0 mu m.
5. The long-life low carbon aluminoferrite cement concrete according to claim 1, characterized in that: the corrosion-resistant and wear-resistant reinforcing material comprises the following components in percentage by weight:
slag powder: 30.0 to 40.0 percent,
alunite is used for preparing the medicine: 40.0 to 60.0 percent,
silicon carbide powder: 10.0 to 20.0 percent.
6. The long-life low carbon aluminoferrite cement concrete of claim 5, characterized in that: the steel slag powder is steel slag micro powder prepared by grinding carbon dioxide gas-cooled steel slag, and D is 50 Less than or equal to 5.0 mu m, wherein the Bo specific surface area is (680+/-20) m 2 The iron oxide content of the steel slag powder is more than or equal to 30 percent, the weight ratio of f-CaO is 2.5 to 4.0 percent, and the weight ratio of f-MgO is 2.0 to 4.0 percent after the steel slag powder is cooled by carbon dioxide gas; the alunite is ground alunite, the content of pure alunite is more than or equal to 70%, the potassium-sodium ratio is more than or equal to 5.5, and the specific surface area is (350+/-20) m 2 /kg; the carborundum powder is ground carborundum powder, and the screen residue with the fineness of 45 mu m is less than or equal to 15.0 percent.
7. The long-life low carbon aluminoferrite cement concrete according to claim 1, characterized in that: the fiber is a mixed fiber composed of steel fiber and polypropylene fiber, the weight percentage of the steel fiber is 85.0-95.0%, the weight percentage of the PVC fiber is 5.0-15.0%, the steel fiber is alloy structural steel, the appearance is longitudinal straight, hooks are arranged at two ends, fine indentations are arranged on the surface, the nominal length is less than or equal to 20mm, the length of the polypropylene fiber is less than or equal to 15mm, and the equivalent diameter is 30 mu m.
8. The long-life low carbon aluminoferrite cement concrete according to claim 1, characterized in that: the water reducer is a polycarboxylic acid and melamine composite high-performance powdery water reducer, the weight percentage of the polycarboxylic acid water reducer is 50.0-75.0%, the weight percentage of the melamine water reducer is 25.0-50.0%, and the water reducing rate is more than or equal to 25%.
9. The long-life low carbon aluminoferrite cement concrete according to claim 1, characterized in that: the fine aggregate is a mixture of machine-made sand and carbonized steel slag, the weight percentage of the machine-made sand is 60.0-75.0 percent, the steel slag is 25.0-40.0 percent, the specific granularity of the machine-made sand is 5.0-6.0, the MB value is less than or equal to 1.0, the stone powder content is less than or equal to 10.0 percent, the flaky particle content is less than or equal to 5.0 percent, the carbonized steel slag is the steel slag which is processed by carbon dioxide carbon fixation, the stability problem is eliminated, the grain size range is 2.5-5.0 mm, and Fe 2 O 3 The content is more than or equal to 30 percent, the coarse aggregate is plastic artificial fine crushed stone, at least one of double-graded aggregate, three-graded aggregate or multi-graded aggregate, the maximum grain diameter is less than or equal to 25.0mm, the close-packed void ratio is 35.0-37.0 percent, and the irregular particle content is less than or equal to 3.0 percent.
10. The preparation method of the long-life low-carbon ferro-aluminate cement concrete segment as claimed in any one of claims 1 to 9, which is characterized by comprising the following steps:
(1) And (3) coating a mold release agent on the mold: spraying an oily release agent in advance for 12 hours, and then spraying an aqueous release agent after 2 hours apart;
(2) And (3) concrete stirring preparation: filling the segment-used ferroaluminate cement concrete dry blend into a concrete transportation mixer truck, adding water according to the formula amount, firstly stirring for 240-300 s at a slow speed, then stirring for 60-90 s at a fast speed, and standing for 120s to obtain segment-used ferroaluminate cement concrete, wherein the slump of the concrete outlet is controlled at 140-180 mm;
(3) And (3) pouring duct piece concrete: pouring the stirred ferroaluminate cement concrete into a mould for three times, pouring one third of the thickness of the pipe piece in the first layer, vibrating for 180 seconds by vibrating air pressure of 0.80-0.85 MPa, and scraping off surface floating paste; pouring the second layer to the thickness of two thirds of the duct piece, vibrating for 120s by using vibrating air pressure of 0.90-0.95 MPa, and scraping off surface floating slurry; pouring the third layer to the top of the duct piece, vibrating for 100s by using vibrating air pressure of 0.95-1.00 MPa, and scraping off superfluous concrete on the surface; simultaneously pouring a reduced-size test piece, and embedding a temperature sensor in the test piece for determining demolding time;
(4) And (3) curing duct piece concrete: spraying a layer of concrete curing agent on the surface of concrete, covering a layer of plastic film, uncovering the film after 30min, checking whether the concrete is close to initial setting, if so, performing secondary plastering and pressing, then spraying water for moisture curing, covering the plastic film, and covering a cotton quilt on the film for heat preservation curing;
(5) And (3) demolding the duct piece: when the temperature in the reduced-size test piece is reduced to below 40 ℃ and the temperature difference between the internal environment and the external environment is lower than 20 ℃, the cotton quilt and the film can be removed in sequence, the mould is loosened, then the pipe piece is lifted out of the mould by the sucker, and the pipe piece is put into water for normal-temperature maintenance.
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