CN107365117B - Self-compacting micro-expansion C60 high-performance concrete - Google Patents
Self-compacting micro-expansion C60 high-performance concrete Download PDFInfo
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- CN107365117B CN107365117B CN201710587624.1A CN201710587624A CN107365117B CN 107365117 B CN107365117 B CN 107365117B CN 201710587624 A CN201710587624 A CN 201710587624A CN 107365117 B CN107365117 B CN 107365117B
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- 239000004574 high-performance concrete Substances 0.000 title claims abstract description 38
- 239000002893 slag Substances 0.000 claims abstract description 89
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 85
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 44
- 230000023556 desulfurization Effects 0.000 claims abstract description 44
- 239000004568 cement Substances 0.000 claims abstract description 39
- 239000003245 coal Substances 0.000 claims abstract description 37
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 35
- 239000004576 sand Substances 0.000 claims abstract description 25
- 238000000227 grinding Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000007873 sieving Methods 0.000 claims abstract description 5
- 239000004575 stone Substances 0.000 claims description 25
- 239000002253 acid Substances 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 6
- 239000002910 solid waste Substances 0.000 abstract description 4
- 238000005056 compaction Methods 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 description 40
- 239000004567 concrete Substances 0.000 description 35
- 239000000203 mixture Substances 0.000 description 25
- 239000003795 chemical substances by application Substances 0.000 description 13
- 239000002994 raw material Substances 0.000 description 10
- 238000003801 milling Methods 0.000 description 8
- 239000012615 aggregate Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910052925 anhydrite Inorganic materials 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000011372 high-strength concrete Substances 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011405 expansive cement Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000011376 self-consolidating concrete Substances 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to self-compacting micro-expansion C60 high-performance concrete, belonging to the technical field of solid waste resource utilization; the technical problem to be solved is to provide self-compacting micro-expansion C60 high-performance concrete; the technical scheme for solving the technical problem is as follows: a self-compacting micro-expansion C60 high-performance concrete comprises the following components in parts by weight: levigating 150-portion sand-desulfurized slag, 406-portion cement, 800-portion river sand, 900-portion gravel, 174-portion water and 7.5-8.7-portion water reducer; the ground desulfurization slag and the cement are cementing materials, and the water reducing agent accounts for 1.5 percent of the total weight of the cementing materials; the ground desulfurized slag is prepared by grinding the desulfurized slag of coal gangue through a ball mill and sieving the ground desulfurized slag through a square-hole sieve of 80 mu m; the specific surface area of the ground desulfurization slag is not less than 600 m2Per kg; the C60 high-performance concrete has the advantages of high strength, self-compaction and micro-expansion; the invention can be widely applied to the field of buildings.
Description
Technical Field
The invention relates to concrete, in particular to self-compacting micro-expansion C60 high-performance concrete, and belongs to the technical field of solid waste resource utilization.
Background
The coal gangue is a black rock with low carbon content associated with coal in the coal-forming process, and is solid waste generated in the coal mining and washing processes. At present, the gangue discharge amount of coal mines accounts for 8% -20% of the coal mining amount, and the average gangue discharge amount is about 12%, so that the gangue discharge amount becomes the most industrial waste in accumulated accumulation amount and occupied area in China. The coal gangue contains heat value components such as carbon, hydrogen, oxygen and the like, and the utilization of the coal gangue for power generation is an important way for the comprehensive utilization of the coal gangue. In order to promote energy conservation and emission reduction and encourage the utilization of coal gangue, the state has specially developed relevant policies aiming at coal gangue power generation, and the construction of a large number of coal gangue power plants is promoted. The coal gangue power plant produces a large amount of ash when digesting the coal gangue to produce economic benefit. The coal gangue desulfurized slag is waste slag discharged from a coal gangue power plant through a furnace bottom after being combusted and desulfurized by a circulating fluidized bed boiler (CFBC). Compared with the Circulating Fluidized Bed (CFB) coal-fired desulfurization ash, the coal gangue is a poor fuel, so the discharge amount of the coal gangue is larger. Due to the differences of coal gangue and common coal in structure and chemical components, the performance of the generated coal gangue desulfurized slag and the common coal desulfurized slag also has great difference. At present, the utilization rate of the CFB coal gangue desulfurization slag is low, and the environmental pollution can be caused when a large amount of CFB coal gangue desulfurization slag is stacked in a loose manner and occupies a large amount of land. The CFB coal gangue desulfurized slag is used for equivalently replacing cement to prepare high-performance concrete, the cement can be saved while the waste slag is digested and utilized, and the method has great practical significance and economic value, but related research reports in the prior art are few.
On the other hand, the concrete prepared in the prior art still has certain defects. First, it is a conventional practice to formulate expansive concrete by providing an expansion source by incorporating an expanding agent or expansive cement, and although shrinkage or self-stress generation can be compensated for, there are problems of a decrease in late strength and poor long-term stability. Secondly, the concrete does not have a self-compacting effect and needs to be vibrated when being used in a building. This not only needs to consume the manpower financial resources, and the produced noise leads to can not carry out the construction at night, influences the construction progress. Finally, ordinary concrete cannot satisfy both the advantages of high performance and low cost.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides self-compacting micro-expansion C60 high-performance concrete. The concrete provided by the invention has the advantages of high strength, self-compaction and shrinkage compensation. On one hand, the utilization of waste residues can be realized, on the other hand, cement can be saved, the strength and durability of concrete are improved, and huge economic benefits and environmental protection benefits are generated.
In order to solve the technical problems, the invention adopts the technical scheme that:
a self-compacting micro-expansion C60 high-performance concrete comprises the following components in parts by weight: levigating 150-portion sand-desulfurized slag, 406-portion cement, 800-portion river sand, 900-portion gravel, 174-portion water and 7.5-8.7-portion water reducer; the ground desulfurizing slag and the cement are gelledThe water reducing agent accounts for 1.5 percent of the total weight of the cementing material; the ground desulfurized slag is prepared by grinding the desulfurized slag of coal gangue through a ball mill and sieving the ground desulfurized slag through a square-hole sieve of 80 mu m; the specific surface area of the ground desulfurization slag is not less than 600 m2/kg。
Further, the specific surface area of the ground desulphurization slag is 620-640 m2/kg。
Further, the self-compacting micro-expansion C60 high-performance concrete comprises the following components in parts by weight: 164.4 parts of ground desulfurization slag, 383.6 parts of cement, 784.7 parts of river sand, 876.9 parts of broken stone, 164.4 parts of water and 8.22 parts of water reducing agent; the ground desulfurized slag is prepared by grinding the desulfurized slag of coal gangue through a ball mill and sieving the ground desulfurized slag through a square-hole sieve of 80 mu m; the specific surface area of the ground desulfurization slag is 635 m2/kg。
The cement is ordinary portland cement with a strength grade of 42.5.
The crushed stone is continuous graded crushed stone with the grain diameter of 5-20 mm.
The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
The concrete adopting the technical scheme of the invention comprises the main raw materials of ground desulphurization slag, cement, river sand, broken stone, water and a water reducing agent. The activity of the coal gangue desulfurization slag can be fully excited in the grinding process, so that an exciting agent is not required to be added. The finely ground desulphurization slag is doped in the concrete, so that a large amount of cement can be saved, the water consumption is effectively reduced under the combined action of the cement and the water reducing agent, the workability of concrete mixture can be improved, the pumpability of the concrete is enhanced, the hydration heat of the concrete is reduced, and the anti-permeability capability of the concrete is improved; improve the pore structure in the concrete, refine and homogenize the pore diameter, and improve the impermeability, freeze-thaw resistance and durability of the concrete. Coal gangue desulfurization slag SO used in the application3SO in the desulfurized slag with a content of 5.91%3Is prepared from II-CaSO4I.e. in the form of anhydrite. The anhydrite has low activity and slow reaction. The activity of the anhydrite can be excited by grinding, so that the anhydrite participates in hydration in the early stage to generate ettringite, the expansion is released in the early stage, and the expansion crack of the set cement caused by later hydration reaction is avoided. Anti-bending of concrete by coarse aggregate (gravel) and fine aggregate (river sand)The strength and the durability are of great significance.
Compared with the prior art, the invention has the following beneficial effects.
1. The coal gangue desulfurization slag used in the invention is industrial waste, and is ground to replace a part of cement to prepare concrete, so that on one hand, the resource utilization of solid waste can be realized, and on the other hand, the production cost of concrete can be saved.
2. The self-compacting concrete does not need to be vibrated, on one hand, environmental noise is not generated, and construction can be carried out at night, so that the building period is shortened; on the other hand, the pouring time can be effectively shortened, the labor intensity and the number of workers are reduced, and the building cost is reduced.
3. The invention utilizes the characteristics of self-hardening, pozzolanic activity and expansibility of the desulfurized slag, replaces an expanding agent or expansive cement by doping the desulfurized slag, and is an innovation for preparing the traditional self-compacting concrete. The concrete can realize compensation shrinkage, is not doped with the expanding agent, can effectively prevent the concrete from cracking and avoids the problem of later strength reduction caused by the addition of the expanding agent. When this application is used as steel pipe high strength concrete, concrete and steel pipe laminating are closely inseparable. In addition, the release time of the expansibility of the concrete can be effectively controlled by using the coal gangue desulfurization residues as raw materials. The expansion performance of the C60 high-performance concrete in the application is mainly released in the early stage (the expansion rate is increased quickly when the curing age is 2 d, 3 d and 7 d), and tends to be stable after 28d in the later stage, so that the spalling phenomenon caused by the expansion in the middle and later stages in the prior art is effectively avoided. In a word, the concrete does not shrink and does not swell in the later use process.
4. According to the high-performance concrete disclosed by the invention, the mixing amount of the ground desulfurization slag accounts for 30% of the mass ratio of the cementing material, so that the strength of the concrete is improved while a large amount of cement is saved, the 7d compressive strength reaches 47MPa, the 28d compressive strength reaches 62MPa, and the high-performance concrete level is reached.
5. The high-performance concrete can obviously improve the bonding performance with a steel interface, effectively exert the performance of cooperative work with steel, improve the bearing capacity, and can be widely applied to steel pipe concrete or section steel concrete composite structures.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main components of the high-performance concrete of the application C60 are as follows: cementing material, fine aggregate, coarse aggregate, water and water reducing agent. Specifically, the cementing material is cement and ground desulphurization slag, and the mixing amount of the ground desulphurization slag accounts for 30% of the total mass of the cementing material. The cement is P.O42.5 Taiyuan Zhihai cement. The ground desulfurization slag is prepared by grinding the coal gangue desulfurization slag for 70-75 minutes by a ball mill, and the specific surface area is 620-640 m2Passing through a 80 mu m square hole sieve; the fine aggregate is river sand, the fineness modulus is not too large or too small, the relatively continuous particle size distribution from the cementing material to the coarse aggregate is difficult to ensure if the fineness modulus is too large, and the water consumption is increased if the fineness modulus is too small, so that the concrete becomes viscous and is difficult to pump, therefore, medium sand is preferably selected; the coarse aggregate is crushed stone with hard and compact texture, low needle flake content and small water absorption, and is preferably crushed stone with 5-20mm continuous gradation; the water is tap water; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the compatibility of cement and ground desulphurization slag is high, and the water reducing agent accounts for 1.5 percent of the total weight of the cementing material.
The components of the coal gangue desulfurization slag generated by different power plants are different, and the expansion rate and the strength of the concrete can be obviously influenced. The desulphurization slag used in the application is derived from coal gangue desulphurization slag of a coal gangue power plant of Pingyuchao Shanxi. The desulphurization slag comprises the following main chemical components in percentage by mass: SiO 2242.19%，Al2O325.90%，CaO 10.99%，SO35.91%，Fe2O33.10%，MgO 1.35%，TiO20.84%，K2O 0.79%，P2O50.12%，Na2O 0.06%，MnO 0.03%，Cl 0.02%，ZnO0.01%。
Example 1:
the self-compacting micro-expansion C60 high-performance concrete is prepared from the following raw materials in parts by mass: 150kg of ground desulfurization slag, 350kg of cement, 750kg of river sand, 850kg of broken stone and water150kg of water reducing agent and 7.5kg of water reducing agent. In this example, the milling time of the ball mill was 70 minutes when preparing the fine-milled desulfurization slag, and the specific surface area of the obtained fine-milled desulfurization slag was 620 m2/kg。
Pouring the weighed broken stone into a stirrer, then sequentially pouring river sand and cement, grinding the desulfurized slag, and uniformly stirring to obtain a uniformly mixed mixture; pouring 40-60% of water into a stirrer, and stirring to fully pre-wet the mixture; pouring the weighed water reducing agent into the rest water, and stirring to obtain a uniform mixed water agent; adding the mixed water aqua into the mixture while stirring, and stirring to obtain the self-compacting micro-expansion C60 high-performance concrete.
Example 2:
the self-compacting micro-expansion C60 high-performance concrete is prepared from the following raw materials in parts by mass: 164.4kg of ground desulfurization slag, 383.6kg of cement, 784.7kg of river sand, 876.9kg of broken stone, 164.4kg of water and 8.22kg of water reducing agent. In this example, the milling time of the ball mill was 72 minutes when preparing the ground desulfurization slag, and the specific surface area of the obtained ground desulfurization slag was 635 m2/kg。
Pouring the weighed broken stone into a stirrer, then sequentially pouring river sand and cement, grinding the desulfurized slag, and uniformly stirring to obtain a uniformly mixed mixture; pouring 40-60% of water into a stirrer, and stirring to fully pre-wet the mixture; pouring the weighed water reducing agent into the rest water, and stirring to obtain a uniform mixed water agent; adding the mixed water aqua into the mixture while stirring, and stirring to obtain the self-compacting micro-expansion C60 high-performance concrete.
Example 3:
the self-compacting micro-expansion C60 high-performance concrete is prepared from the following raw materials in parts by mass: 174kg of ground desulfurization slag, 406kg of cement, 800kg of river sand, 900kg of broken stone, 174kg of water and 8.7kg of water reducing agent. In this example, the milling time of the ball mill was 71 minutes when preparing the milled desulfurization slag, and the specific surface area of the obtained milled desulfurization slag was 629 m2/kg。
Pouring the weighed broken stone into a stirrer, then sequentially pouring river sand and cement, grinding the desulfurized slag, and uniformly stirring to obtain a uniformly mixed mixture; pouring 40-60% of water into a stirrer, and stirring to fully pre-wet the mixture; pouring the weighed water reducing agent into the rest water, and stirring to obtain a uniform mixed water agent; adding the mixed water aqua into the mixture while stirring, and stirring to obtain the self-compacting micro-expansion C60 high-performance concrete.
Example 4:
the self-compacting micro-expansion C60 high-performance concrete is prepared from the following raw materials in parts by mass: 160.2kg of ground desulfurization slag, 373.8kg of cement, 760.2kg of river sand, 862.3kg of broken stone, 160.2kg of water and 8.01kg of water reducing agent. In this example, the milling time of the ball mill was 73 minutes when preparing the fine-milled desulfurization slag, and the specific surface area of the obtained fine-milled desulfurization slag was 638 m2/kg。
Pouring the weighed broken stone into a stirrer, then sequentially pouring river sand and cement, grinding the desulfurized slag, and uniformly stirring to obtain a uniformly mixed mixture; pouring 40-60% of water into a stirrer, and stirring to fully pre-wet the mixture; pouring the weighed water reducing agent into the rest water, and stirring to obtain a uniform mixed water agent; adding the mixed water aqua into the mixture while stirring, and stirring to obtain the self-compacting micro-expansion C60 high-performance concrete.
Example 5:
the self-compacting micro-expansion C60 high-performance concrete is prepared from the following raw materials in parts by mass: 163.2kg of ground desulfurization slag, 380.8kg of cement, 770kg of river sand, 863.7kg of broken stone, 163.2kg of water and 8.16kg of water reducing agent. In this example, the milling time of the ball mill was 73 minutes when preparing the fine-milled desulfurization slag, and the specific surface area of the obtained fine-milled desulfurization slag was 638 m2/kg。
Pouring the weighed broken stone into a stirrer, then sequentially pouring river sand and cement, grinding the desulfurized slag, and uniformly stirring to obtain a uniformly mixed mixture; pouring 40-60% of water into a stirrer, and stirring to fully pre-wet the mixture; pouring the weighed water reducing agent into the rest water, and stirring to obtain a uniform mixed water agent; adding the mixed water aqua into the mixture while stirring, and stirring to obtain the self-compacting micro-expansion C60 high-performance concrete.
Example 6:
preparing self-compacting micro-expansion C60 high-performance concrete, raw materials and corresponding substances thereofThe amounts were as follows: 168kg of ground desulfurization slag, 392kg of cement, 780kg of river sand, 870.2kg of broken stone, 168kg of water and 8.4kg of water reducing agent. In this example, the milling time of the ball mill was 74 minutes when preparing the milled desulfurization slag, and the specific surface area of the obtained milled desulfurization slag was 639 m2/kg。
Pouring the weighed broken stone into a stirrer, then sequentially pouring river sand and cement, grinding the desulfurized slag, and uniformly stirring to obtain a uniformly mixed mixture; pouring 40-60% of water into a stirrer, and stirring to fully pre-wet the mixture; pouring the weighed water reducing agent into the rest water, and stirring to obtain a uniform mixed water agent; adding the mixed water aqua into the mixture while stirring, and stirring to obtain the self-compacting micro-expansion C60 high-performance concrete.
Example 7:
the self-compacting micro-expansion C60 high-performance concrete is prepared from the following raw materials in parts by mass: 170.1kg of ground desulfurized slag, 396.9kg of cement, 785kg of river sand, 879.3kg of broken stone, 170.1kg of water and 8.51kg of water reducing agent. In this example, the milling time of the ball mill was 75 minutes when preparing the fine-milled desulfurization slag, and the specific surface area of the obtained fine-milled desulfurization slag was 640 m2/kg。
Pouring the weighed broken stone into a stirrer, then sequentially pouring river sand and cement, grinding the desulfurized slag, and uniformly stirring to obtain a uniformly mixed mixture; pouring 40-60% of water into a stirrer, and stirring to fully pre-wet the mixture; pouring the weighed water reducing agent into the rest water, and stirring to obtain a uniform mixed water agent; adding the mixed water aqua into the mixture while stirring, and stirring to obtain the self-compacting micro-expansion C60 high-performance concrete.
Example 8:
the self-compacting micro-expansion C60 high-performance concrete is prepared from the following raw materials in parts by mass: 172.5kg of ground desulfurization slag, 402.5kg of cement, 790kg of river sand, 890kg of broken stone, 172.5kg of water and 8.63kg of water reducing agent. In this example, the milling time of the ball mill was 73 minutes when preparing the fine-milled desulfurization slag, and the specific surface area of the obtained fine-milled desulfurization slag was 638 m2/kg。
Pouring the weighed broken stone into a stirrer, then sequentially pouring river sand and cement, grinding the desulfurized slag, and uniformly stirring to obtain a uniformly mixed mixture; pouring 40-60% of water into a stirrer, and stirring to fully pre-wet the mixture; pouring the weighed water reducing agent into the rest water, and stirring to obtain a uniform mixed water agent; adding the mixed water aqua into the mixture while stirring, and stirring to obtain the self-compacting micro-expansion C60 high-performance concrete.
The slump expansion of the high-performance concrete in the above examples 1 to 8 reaches SF1 level, and can be applied to the following aspects: 1. concrete structures poured from the top with no or few reinforcements; 2. pumping and pouring construction; 3. the cross section is small, and a vertical structure which can move horizontally for a long distance is not needed.
The concrete of examples 1-4 above was tested for compressive strength and expansion rate with the relevant properties shown in Table 1. As can be seen from Table 1, the compressive strength of the concrete reaches 47MPa in 7d and 62MPa in 28d, and the concrete reaches the grade of high-strength concrete. In addition, when the curing age is 2, 3 or 7 days, the expansion rate of the concrete increases rapidly, and the concrete tends to be stable after the later 28 days. Therefore, the high-strength concrete is obtained by adding the ground desulfurized slag, the expansion performance of the obtained concrete can be released in the early stage, and the cracking problem caused by later expansion is avoided.
Table 1.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The above-described embodiments of the invention are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, and not by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. The self-compacting micro-expansion C60 high-performance concrete is characterized by comprising the following components in parts by weight: levigating 150-portion sand-desulfurized slag, 406-portion cement, 800-portion river sand, 900-portion gravel, 174-portion water and 7.5-8.7-portion water reducer; the ground desulfurization slag and the cement are cementing materials, and the water reducing agent accounts for 1.5 percent of the total weight of the cementing materials; the ground desulfurized slag is prepared by grinding the desulfurized slag of coal gangue through a ball mill and sieving the ground desulfurized slag through a square-hole sieve of 80 mu m; the specific surface area of the ground desulfurization slag is not less than 600 m2/kg；
The cement is ordinary portland cement with a strength grade of 42.5.
2. The self-compacting micro-expansion C60 high-performance concrete as claimed in claim 1, wherein the specific surface area of the ground desulfurization slag is 620-640 m2/kg。
3. The self-compacting micro-expanded C60 high-performance concrete according to claim 1, comprising the following components in parts by weight: 164.4 parts of ground desulfurization slag, 383.6 parts of cement, 784.7 parts of river sand, 876.9 parts of broken stone, 164.4 parts of water and 8.22 parts of water reducing agent; the ground desulfurized slag is prepared by grinding the desulfurized slag of coal gangue through a ball mill and sieving the ground desulfurized slag through a square-hole sieve of 80 mu m; the specific surface area of the ground desulfurization slag is 635 m2/kg。
4. A self-compacting micro-expansive C60 high performance concrete according to any one of claims 1-3, wherein said crushed stones are continuous graded crushed stones with a particle size of 5-20 mm.
5. The self-compacting micro-expansive C60 high-performance concrete according to any one of claims 1-3, wherein the water reducer is a polycarboxylic acid high-efficiency water reducer.
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| KR20170001762A (en) * | 2015-06-22 | 2017-01-05 | 아하그린텍 주식회사 | Method of Preparing Artificial Light-weight Aggregates |
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