CN111606625A - Formula and preparation method of C70 high-strength self-compacting concrete - Google Patents
Formula and preparation method of C70 high-strength self-compacting concrete Download PDFInfo
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- CN111606625A CN111606625A CN202010478617.XA CN202010478617A CN111606625A CN 111606625 A CN111606625 A CN 111606625A CN 202010478617 A CN202010478617 A CN 202010478617A CN 111606625 A CN111606625 A CN 111606625A
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- 239000011376 self-consolidating concrete Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000009472 formulation Methods 0.000 title claims description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 31
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 26
- 239000000654 additive Substances 0.000 claims abstract description 23
- 230000000996 additive effect Effects 0.000 claims abstract description 23
- 239000002131 composite material Substances 0.000 claims abstract description 22
- 239000002270 dispersing agent Substances 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 16
- 239000010881 fly ash Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 47
- 239000011863 silicon-based powder Substances 0.000 claims description 47
- 238000003756 stirring Methods 0.000 claims description 34
- 239000000203 mixture Substances 0.000 claims description 23
- 239000000843 powder Substances 0.000 claims description 19
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 18
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 10
- BSWXAWQTMPECAK-UHFFFAOYSA-N 6,6-diethyloctyl dihydrogen phosphate Chemical group CCC(CC)(CC)CCCCCOP(O)(O)=O BSWXAWQTMPECAK-UHFFFAOYSA-N 0.000 claims description 9
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 claims description 9
- 229940073507 cocamidopropyl betaine Drugs 0.000 claims description 9
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- DCNHVBSAFCNMBK-UHFFFAOYSA-N naphthalene-1-sulfonic acid;hydrate Chemical group O.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 DCNHVBSAFCNMBK-UHFFFAOYSA-N 0.000 claims description 9
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- 239000012991 xanthate Substances 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 6
- 239000004567 concrete Substances 0.000 abstract description 30
- 238000010276 construction Methods 0.000 abstract description 6
- 239000011398 Portland cement Substances 0.000 description 16
- 239000002994 raw material Substances 0.000 description 10
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 229920002748 Basalt fiber Polymers 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 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
- C04B28/04—Portland 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a formula of C70 high-strength self-compacting concrete and a preparation method thereof; relates to the technical field of concrete preparation, and comprises the following components in parts by weight: cement, fly ash, water, fine sand, coarse aggregate, modified silica fume, a dispersant, a water reducing agent and a composite additive; the C70 high-strength self-compacting concrete prepared by the method has excellent flexural strength, shorter setting time and higher flexural strength, can better improve the application range of the concrete, has shorter setting time, can shorten the setting time as much as possible after the concrete is constructed, avoids the phenomenon that the concrete is damaged when not set due to the influence of external factors, and further ensures the quality of a construction object.
Description
Technical Field
The invention belongs to the technical field of concrete preparation, and particularly relates to a C70 high-strength self-compacting concrete formula and a preparation method thereof.
Background
Concrete is a generic term for engineering composites where aggregates are cemented into a whole by cementitious materials. The concrete is prepared by mixing cement as a cementing material and sand and stone as aggregates with water according to a certain proportion and stirring, is also called as common concrete and is widely applied to civil engineering. Along with the rapid development of the building industry, the level of building equipment is continuously improved, novel construction technology is continuously developed and popularized, and the concrete technology needs to be developed to adapt to different design, construction and use requirements. At present, more novel buildings with the characteristics of high rise, thin-wall structures and the like continuously appear, which put higher requirements on concrete, and common concrete can not meet the requirements, so that self-compacting concrete is produced at the right moment.
The prior art is as follows: the invention discloses high-strength self-compacting concrete with application number 201510821222.4, which comprises the following raw materials in parts by weight: 3 parts of basalt fiber, 2 parts of steel fiber, 4 parts of glass fiber, 100 parts of cement, 160 parts of fly ash, 800 parts of crushed stone with the particle size of 10-15mm, 250 parts of crushed stone with the particle size of 15-20mm, 500 parts of sand, 150 parts of water, 10 parts of bentonite, 0.5 part of superplasticizer, 1 part of air entraining agent, 0.1 part of defoaming agent, 0.4 part of rosin thermopolymer, 0.02 part of tackifier, 0.4 part of sodium dodecyl sulfate and 0.4 part of calcium stearate. The high-strength self-compacting concrete disclosed by the invention makes full use of the characteristics of all raw materials, so that the strength of the prepared concrete is greatly improved, the strength of the concrete is improved by more than 50% compared with that of the concrete in the prior art, the concrete is specially used for prefabricating a reinforced concrete hollow square pile, and the bearing capacity of the square pile single pile prepared by the concrete is higher. "although a high strength self-compacting concrete is disclosed, its flexural strength is general and setting time is long.
Disclosure of Invention
The invention aims to provide a formula and a preparation method of C70 high-strength self-compacting concrete, which aim to solve the defects in the prior art.
The technical scheme adopted by the invention is as follows:
the formula of the C70 high-strength self-compacting concrete comprises the following components in parts by weight: 170-186 cement, 83-86 fly ash, 160-167 water, 720 fine sand, 750 coarse aggregate, 345-367 coarse aggregate, 16-18 modified silica fume, 8-12 dispersant, 5-7 water reducer and 10-14 composite additive;
the composite additive is prepared from the following components in parts by weight: 3-5 parts of xanthate, 5-8 parts of cocamidopropyl betaine, 1-2 parts of sodium stearate and 6-8 parts of diatomite.
As a further technical scheme: the preparation method of the modified micro silicon powder comprises the following steps:
(1) uniformly dispersing the micro silicon powder into a maleic anhydride solution with the mass fraction of 10.5%, stirring at the rotating speed of 500r/min for 10min, and then standing for 20min to obtain a mixed dispersion liquid;
(2) and adding calcium aluminate powder into the mixed dispersion liquid, heating to 70 ℃, stirring at the rotating speed of 500r/min for 40min, then filtering, washing and drying to constant weight to obtain the modified micro silicon powder.
As a further technical scheme: the mixing ratio of the micro silicon powder to the maleic anhydride solution is 150 g: 550 mL.
As a further technical scheme: the mass ratio of the calcium aluminate powder to the micro silicon powder is 1: 10.
As a further technical scheme: the water reducing agent is a naphthalene sulfonate water reducing agent.
As a further technical scheme: the dispersant is triethyl hexyl phosphoric acid.
As a further technical scheme: the coarse aggregate is crushed stone with the granularity of 3-5 mm.
A preparation method of a C70 high-strength self-compacting concrete formula comprises the following steps:
(1) drying the cement to obtain dry cement;
(2) adding cement, fly ash, fine sand and coarse aggregate into a stirrer in advance according to the proportion, and uniformly stirring to obtain a primary mixture;
(3) and sequentially feeding the modified micro silicon powder, the dispersing agent and the composite additive into a stirrer according to the proportion, stirring for 10min, then adding the water reducing agent, continuously stirring for 12min at the rotating speed of 300r/min, then adding water, continuously stirring for 20min at the rotating speed of 500r/min, and uniformly stirring to obtain the C70 high-strength self-compacting concrete.
Wherein, the specification of the raw material of the micro silicon powder adopted in the modified micro silicon powder is SF 95;
the cement used in the present invention includes, but is not limited to, portland cement or other mixed cement, etc.
Portland cement is preferred in the present invention and includes, but is not limited to, low heat Portland cement, ordinary Portland cement, early strength Portland cement, ultra-early strength Portland cement, moderate heat Portland cement, sulfate-resistant Portland cement, and the like.
Has the advantages that: the C70 high-strength self-compacting concrete prepared by the method has excellent flexural strength, shorter setting time and higher flexural strength, can better improve the application range of the concrete, has shorter setting time, can shorten the setting time as much as possible after the concrete is constructed, and avoids the phenomenon that the concrete is damaged when the concrete is not set due to the influence of external factors, thereby ensuring the quality of a construction object.
Detailed Description
The formula of the C70 high-strength self-compacting concrete comprises the following components in parts by weight: 170-186 cement, 83-86 fly ash, 160-167 water, 720 fine sand, 750 coarse aggregate, 345-367 coarse aggregate, 16-18 modified silica fume, 8-12 dispersant, 5-7 water reducer and 10-14 composite additive;
the composite additive is prepared from the following components in parts by weight: 3-5 parts of xanthate, 5-8 parts of cocamidopropyl betaine, 1-2 parts of sodium stearate and 6-8 parts of diatomite.
The preparation method of the modified micro silicon powder comprises the following steps:
(1) uniformly dispersing the micro silicon powder into a maleic anhydride solution with the mass fraction of 10.5%, stirring at the rotating speed of 500r/min for 10min, and then standing for 20min to obtain a mixed dispersion liquid;
(2) and adding calcium aluminate powder into the mixed dispersion liquid, heating to 70 ℃, stirring at the rotating speed of 500r/min for 40min, then filtering, washing and drying to constant weight to obtain the modified micro silicon powder.
Wherein, the specification of the raw material of the micro silicon powder adopted in the modified micro silicon powder is SF 95;
the mixing ratio of the micro silicon powder to the maleic anhydride solution is 150 g: 550 mL.
The mass ratio of the calcium aluminate powder to the micro silicon powder is 1: 10.
The water reducing agent is a naphthalene sulfonate water reducing agent.
The dispersant is triethyl hexyl phosphoric acid.
The coarse aggregate is crushed stone with the granularity of 3-5 mm.
According to the invention, through reasonable proportioning of the components and reasonable proportioning of the cement, the fine sand, the coarse aggregate and the composite additive, the yield stress of the concrete is reduced enough to be overcome by the shear stress generated by self weight, so that the fluidity of the concrete is increased, the problems of segregation and bleeding are avoided, the space in the template can be fully filled, and a compact and uniform gelled structure is formed.
A preparation method of a C70 high-strength self-compacting concrete formula comprises the following steps:
(1) drying the cement to obtain dry cement;
(2) adding cement, fly ash, fine sand and coarse aggregate into a stirrer in advance according to the proportion, and uniformly stirring to obtain a primary mixture;
(3) and sequentially feeding the modified micro silicon powder, the dispersing agent and the composite additive into a stirrer according to the proportion, stirring for 10min, then adding the water reducing agent, continuously stirring for 12min at the rotating speed of 300r/min, then adding water, continuously stirring for 20min at the rotating speed of 500r/min, and uniformly stirring to obtain the C70 high-strength self-compacting concrete. The C70 high-strength self-compacting concrete prepared by the method has excellent flexural strength, shorter setting time and higher flexural strength, can better improve the application range of the concrete, has shorter setting time, can shorten the setting time as much as possible after the concrete is constructed, avoids the phenomenon that the concrete is damaged when not set due to the influence of external factors, and further ensures the quality of a construction object.
The cement used in the present invention includes, but is not limited to, portland cement or other mixed cement, etc.
Portland cement is preferred in the present invention and includes, but is not limited to, low heat Portland cement, ordinary Portland cement, early strength Portland cement, ultra-early strength Portland cement, moderate heat Portland cement, sulfate-resistant Portland cement, and the like.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The formula of the C70 high-strength self-compacting concrete comprises the following components in parts by weight: 170 parts of cement, 83 parts of fly ash, 160 parts of water, 720 parts of fine sand, 345 parts of coarse aggregate, 16 parts of modified micro silicon powder, 8 parts of dispersing agent, 5 parts of water reducing agent and 10 parts of compound additive;
the composite additive is prepared from the following components in parts by weight: xanthate 3, cocamidopropyl betaine 5, sodium stearate 1 and diatomite 6.
The preparation method of the modified micro silicon powder comprises the following steps:
(1) uniformly dispersing the micro silicon powder into a maleic anhydride solution with the mass fraction of 10.5%, stirring at the rotating speed of 500r/min for 10min, and then standing for 20min to obtain a mixed dispersion liquid;
(2) adding calcium aluminate powder into the mixed dispersion liquid, heating to 70 ℃, stirring for 40min at the rotating speed of 500r/min, then filtering, washing and drying to constant weight to obtain modified silica fume, wherein the specification of the silica fume raw material adopted in the modified silica fume is SF 95;
the mixing ratio of the micro silicon powder to the maleic anhydride solution is 150 g: 550 mL.
The mass ratio of the calcium aluminate powder to the micro silicon powder is 1: 10.
The water reducing agent is a naphthalene sulfonate water reducing agent.
The dispersant is triethyl hexyl phosphoric acid.
The coarse aggregate granularity is 3 mm's rubble.
Example 2
The formula of the C70 high-strength self-compacting concrete comprises the following components in parts by weight: cement 186, fly ash 86, water 167, fine sand 750, coarse aggregate 367, modified micro-silica powder 18, a dispersing agent 12, a water reducing agent 7 and a composite additive 14;
the composite additive is prepared from the following components in parts by weight: xanthate 5, cocamidopropyl betaine 8, sodium stearate 2 and diatomite 8.
The preparation method of the modified micro silicon powder comprises the following steps:
(1) uniformly dispersing the micro silicon powder into a maleic anhydride solution with the mass fraction of 10.5%, stirring at the rotating speed of 500r/min for 10min, and then standing for 20min to obtain a mixed dispersion liquid;
(2) adding calcium aluminate powder into the mixed dispersion liquid, heating to 70 ℃, stirring for 40min at the rotating speed of 500r/min, then filtering, washing and drying to constant weight to obtain modified silica fume, wherein the specification of the silica fume raw material adopted in the modified silica fume is SF 95;
the mixing ratio of the micro silicon powder to the maleic anhydride solution is 150 g: 550 mL.
The mass ratio of the calcium aluminate powder to the micro silicon powder is 1: 10.
The water reducing agent is a naphthalene sulfonate water reducing agent.
The dispersant is triethyl hexyl phosphoric acid.
The coarse aggregate granularity is 5 mm's rubble.
Example 3
The formula of the C70 high-strength self-compacting concrete comprises the following components in parts by weight: cement 186, fly ash 83, water 160, fine sand 750, coarse aggregate 345, modified silica fume 18, a dispersant 8, a water reducing agent 7 and a composite additive 10;
the composite additive is prepared from the following components in parts by weight: xanthate 5, cocamidopropyl betaine 5, sodium stearate 2 and diatomite 6.
The preparation method of the modified micro silicon powder comprises the following steps:
(1) uniformly dispersing the micro silicon powder into a maleic anhydride solution with the mass fraction of 10.5%, stirring at the rotating speed of 500r/min for 10min, and then standing for 20min to obtain a mixed dispersion liquid;
(2) adding calcium aluminate powder into the mixed dispersion liquid, heating to 70 ℃, stirring for 40min at the rotating speed of 500r/min, then filtering, washing and drying to constant weight to obtain modified silica fume, wherein the specification of the silica fume raw material adopted in the modified silica fume is SF 95;
the mixing ratio of the micro silicon powder to the maleic anhydride solution is 150 g: 550 mL.
The mass ratio of the calcium aluminate powder to the micro silicon powder is 1: 10.
The water reducing agent is a naphthalene sulfonate water reducing agent.
The dispersant is triethyl hexyl phosphoric acid.
The coarse aggregate granularity is 5 mm's rubble.
Example 4
The formula of the C70 high-strength self-compacting concrete comprises the following components in parts by weight: cement 173, fly ash 85, water 163, fine sand 730, coarse aggregate 357, modified silica fume 17, dispersant 10, water reducer 6 and composite additive 12;
the composite additive is prepared from the following components in parts by weight: xanthate 4, cocamidopropyl betaine 6, sodium stearate 1.2 and diatomite 7.
The preparation method of the modified micro silicon powder comprises the following steps:
(1) uniformly dispersing the micro silicon powder into a maleic anhydride solution with the mass fraction of 10.5%, stirring at the rotating speed of 500r/min for 10min, and then standing for 20min to obtain a mixed dispersion liquid;
(2) adding calcium aluminate powder into the mixed dispersion liquid, heating to 70 ℃, stirring for 40min at the rotating speed of 500r/min, then filtering, washing and drying to constant weight to obtain modified silica fume, wherein the specification of the silica fume raw material adopted in the modified silica fume is SF 95;
the mixing ratio of the micro silicon powder to the maleic anhydride solution is 150 g: 550 mL.
The mass ratio of the calcium aluminate powder to the micro silicon powder is 1: 10.
The water reducing agent is a naphthalene sulfonate water reducing agent.
The dispersant is triethyl hexyl phosphoric acid.
The coarse aggregate granularity is 4 mm's rubble.
Example 5
The formula of the C70 high-strength self-compacting concrete comprises the following components in parts by weight: cement 173, fly ash 83, water 167, fine sand 720, coarse aggregate 357, modified silica fume 16, dispersant 12, water reducer 5 and compound additive 12;
the composite additive is prepared from the following components in parts by weight: xanthate 5, cocamidopropyl betaine 5, sodium stearate 2 and diatomite 6.
The preparation method of the modified micro silicon powder comprises the following steps:
(1) uniformly dispersing the micro silicon powder into a maleic anhydride solution with the mass fraction of 10.5%, stirring at the rotating speed of 500r/min for 10min, and then standing for 20min to obtain a mixed dispersion liquid;
(2) adding calcium aluminate powder into the mixed dispersion liquid, heating to 70 ℃, stirring for 40min at the rotating speed of 500r/min, then filtering, washing and drying to constant weight to obtain modified silica fume, wherein the specification of the silica fume raw material adopted in the modified silica fume is SF 95;
the mixing ratio of the micro silicon powder to the maleic anhydride solution is 150 g: 550 mL.
The mass ratio of the calcium aluminate powder to the micro silicon powder is 1: 10.
The water reducing agent is a naphthalene sulfonate water reducing agent.
The dispersant is triethyl hexyl phosphoric acid.
The coarse aggregate granularity is 4 mm's rubble.
Example 7
The formula of the C70 high-strength self-compacting concrete comprises the following components in parts by weight: 179 cement, 85 fly ash, 161 water, 740 fine sand, 367 coarse aggregate, 17 modified silica fume, 8 dispersing agent, 6 water reducing agent and 11 composite additive;
the composite additive is prepared from the following components in parts by weight: xanthate 5, cocamidopropyl betaine 8, sodium stearate 1 and diatomite 7.
The preparation method of the modified micro silicon powder comprises the following steps:
(1) uniformly dispersing the micro silicon powder into a maleic anhydride solution with the mass fraction of 10.5%, stirring at the rotating speed of 500r/min for 10min, and then standing for 20min to obtain a mixed dispersion liquid;
(2) adding calcium aluminate powder into the mixed dispersion liquid, heating to 70 ℃, stirring for 40min at the rotating speed of 500r/min, then filtering, washing and drying to constant weight to obtain modified silica fume, wherein the specification of the silica fume raw material adopted in the modified silica fume is SF 95;
the mixing ratio of the micro silicon powder to the maleic anhydride solution is 150 g: 550 mL.
The mass ratio of the calcium aluminate powder to the micro silicon powder is 1: 10.
The water reducing agent is a naphthalene sulfonate water reducing agent.
The dispersant is triethyl hexyl phosphoric acid.
The coarse aggregate granularity is 5 mm's rubble.
Test of
Concrete strength detection
The flexural strength and setting time of the concrete of the examples and the comparative examples were measured and compared:
TABLE 1
| 28d flexural strength/MPa | Coagulation time/min | |
| Example 1 | 9.53 | 220 |
| Example 2 | 9.10 | 210 |
| Example 3 | 9.67 | 208 |
| Examples | 9.33 | 216 |
| Examples | 9.45 | 211 |
| Examples | 9.27 | 227 |
| Examples | 9.52 | 225 |
| Control group | 8.06 | 361 |
Control group: application No. 201510821222.4, the present invention discloses a high strength self-compacting concrete;
as can be seen from Table 1, the C70 high-strength self-compacting concrete prepared by the method has excellent flexural strength, short setting time and high flexural strength, can better improve the application range of the concrete, and the short setting time can shorten the setting time as much as possible after the concrete is constructed, so that the phenomenon that the concrete is damaged when not set due to the influence of external factors is avoided, and the quality of a construction object is guaranteed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, but rather should be construed in the spirit and scope of the present invention as defined by the appended claims.
Claims (8)
1. A C70 high-strength self-compacting concrete formula is characterized in that: the composition is prepared from the following components in parts by weight: 170-186 cement, 83-86 fly ash, 160-167 water, 720 fine sand, 750 coarse aggregate, 345-367 coarse aggregate, 16-18 modified silica fume, 8-12 dispersant, 5-7 water reducer and 10-14 composite additive;
the composite additive is prepared from the following components in parts by weight: 3-5 parts of xanthate, 5-8 parts of cocamidopropyl betaine, 1-2 parts of sodium stearate and 6-8 parts of diatomite.
2. The formulation of claim 1, wherein the formulation is a C70 high strength self-compacting concrete formulation comprising: the preparation method of the modified micro silicon powder comprises the following steps:
(1) uniformly dispersing the micro silicon powder into a maleic anhydride solution with the mass fraction of 10.5%, stirring at the rotating speed of 500r/min for 10min, and then standing for 20min to obtain a mixed dispersion liquid;
(2) and adding calcium aluminate powder into the mixed dispersion liquid, heating to 70 ℃, stirring at the rotating speed of 500r/min for 40min, then filtering, washing and drying to constant weight to obtain the modified micro silicon powder.
3. The formulation of claim 2, wherein the formulation is a C70 high strength self-compacting concrete formulation, comprising: the mixing ratio of the micro silicon powder to the maleic anhydride solution is 150 g: 550 mL.
4. The formulation of claim 2, wherein the formulation is a C70 high strength self-compacting concrete formulation, comprising: the mass ratio of the calcium aluminate powder to the micro silicon powder is 1: 10.
5. The formulation of claim 1, wherein the formulation is a C70 high strength self-compacting concrete formulation comprising: the water reducing agent is a naphthalene sulfonate water reducing agent.
6. The formulation of claim 1, wherein the formulation is a C70 high strength self-compacting concrete formulation comprising: the dispersant is triethyl hexyl phosphoric acid.
7. The formulation of claim 1, wherein the formulation is a C70 high strength self-compacting concrete formulation comprising: the coarse aggregate is crushed stone with the granularity of 3-5 mm.
8. The method of claim 1, wherein the formulation of C70 high strength self-compacting concrete is prepared by: the method comprises the following steps:
(1) drying the cement to obtain dry cement;
(2) adding cement, fly ash, fine sand and coarse aggregate into a stirrer in advance according to the proportion, and uniformly stirring to obtain a primary mixture;
(3) and sequentially feeding the modified micro silicon powder, the dispersing agent and the composite additive into a stirrer according to the proportion, stirring for 10min, then adding the water reducing agent, continuously stirring for 12min at the rotating speed of 300r/min, then adding water, continuously stirring for 20min at the rotating speed of 500r/min, and uniformly stirring to obtain the C70 high-strength self-compacting concrete.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113511865A (en) * | 2021-07-28 | 2021-10-19 | 河北宏京新型建材有限公司 | Preparation method of fiber concrete prefabricated truss |
| CN115536340A (en) * | 2022-10-25 | 2022-12-30 | 中铁二十四局集团安徽工程有限公司 | C60 high-performance self-compacting concrete suitable for arch structure and preparation method thereof |
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| CN107640917A (en) * | 2017-09-25 | 2018-01-30 | 常州市绿意管道有限公司 | A kind of preparation method of high intensity foam cement |
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| CN109467352A (en) * | 2018-12-29 | 2019-03-15 | 海南华盛混凝土有限公司 | A kind of C70 high intensity self-compacting concrete formula and preparation method thereof |
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| US5919300A (en) * | 1996-10-27 | 1999-07-06 | Sika Ag. Vorm. Kaspar Winkler & Co. | Dispersing agent for high-flow or self-compacting concrete |
| US20050150428A1 (en) * | 2003-10-30 | 2005-07-14 | Kenrou Mitsui | Ultra high-strength hydraulic cement compositions |
| CN107640917A (en) * | 2017-09-25 | 2018-01-30 | 常州市绿意管道有限公司 | A kind of preparation method of high intensity foam cement |
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| CN113511865A (en) * | 2021-07-28 | 2021-10-19 | 河北宏京新型建材有限公司 | Preparation method of fiber concrete prefabricated truss |
| CN115536340A (en) * | 2022-10-25 | 2022-12-30 | 中铁二十四局集团安徽工程有限公司 | C60 high-performance self-compacting concrete suitable for arch structure and preparation method thereof |
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