CN116874253A - Low-shrinkage concrete for prefabricated part and preparation method thereof - Google Patents
Low-shrinkage concrete for prefabricated part and preparation method thereof Download PDFInfo
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- CN116874253A CN116874253A CN202310823222.2A CN202310823222A CN116874253A CN 116874253 A CN116874253 A CN 116874253A CN 202310823222 A CN202310823222 A CN 202310823222A CN 116874253 A CN116874253 A CN 116874253A
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- 238000002360 preparation method Methods 0.000 title abstract description 15
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- 239000002245 particle Substances 0.000 claims abstract description 88
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- 239000004033 plastic Substances 0.000 claims abstract description 71
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000000203 mixture Substances 0.000 claims abstract description 48
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 36
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- 230000000996 additive effect Effects 0.000 claims abstract description 27
- 239000004575 stone Substances 0.000 claims abstract description 24
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 16
- 239000011398 Portland cement Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 28
- 239000000835 fiber Substances 0.000 claims description 24
- 239000003112 inhibitor Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 23
- 239000010453 quartz Substances 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 229920000742 Cotton Polymers 0.000 claims description 18
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 18
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 18
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 18
- 229920006324 polyoxymethylene Polymers 0.000 claims description 18
- 239000005995 Aluminium silicate Substances 0.000 claims description 17
- 235000012211 aluminium silicate Nutrition 0.000 claims description 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 16
- 239000011575 calcium Substances 0.000 claims description 16
- 229910052791 calcium Inorganic materials 0.000 claims description 16
- 239000001506 calcium phosphate Substances 0.000 claims description 16
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 16
- 235000011010 calcium phosphates Nutrition 0.000 claims description 16
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims description 16
- 235000010261 calcium sulphite Nutrition 0.000 claims description 16
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical group [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 16
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 239000004417 polycarbonate Substances 0.000 claims description 15
- 239000003469 silicate cement Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000005303 weighing Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
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- 229920001893 acrylonitrile styrene Polymers 0.000 claims description 8
- 229920000515 polycarbonate Polymers 0.000 claims description 8
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 claims description 8
- 239000002956 ash Substances 0.000 claims description 7
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 15
- 230000002195 synergetic effect Effects 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
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- 230000008569 process Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
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- 238000011049 filling Methods 0.000 description 4
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- 239000000126 substance Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
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- 230000002708 enhancing effect Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000009417 prefabrication Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000012994 photoredox catalyst Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 125000001309 chloro group Chemical class Cl* 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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- 238000011105 stabilization Methods 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
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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
-
- 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)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of concrete preparation, in particular to low-shrinkage concrete for prefabricated parts and a preparation method thereof. The low shrinkage concrete for the prefabricated parts comprises the following raw materials in parts by weight: 50-60 parts of pozzolan cement, 300-360 parts of Portland cement, 20-25 parts of waste hard plastic particles, 300-350 parts of sand, 200-300 parts of broken stone, 200-250 parts of recycled aggregate, 300-350 parts of modified mineral powder, 10.5-11.6 parts of additive and 180-230 parts of water, wherein the recycled aggregate is a composition of fly ash recycled aggregate, reinforced concrete waste recycled aggregate and crushed concrete recycled aggregate according to a mass ratio of 5:2-3:3-4, so that the low shrinkage concrete is prepared, the crack of the concrete can be prevented, and the mechanical strength of the concrete is ensured, and the low shrinkage concrete is more suitable for the production of prefabricated parts.
Description
Technical Field
The application relates to the technical field of concrete preparation, in particular to low-shrinkage concrete for prefabricated parts and a preparation method thereof.
Background
At present, in bridge roads and various projects, assembled concrete has gradually become a trend due to the characteristics of factory prefabrication, standardized construction, reliable quality, high construction speed, high cost performance and the like. Compared with cast-in-place concrete, the prefabricated part is prepared in advance and then transported to the site for installation, so that not only is 80% of site construction labor force reduced, but also the labor intensity of site workers is greatly reduced, and the safety operation of constructors is ensured. The safety and the quality are ensured, and meanwhile, the work efficiency is also obviously improved. The pollution of on-site dust, slurry, lamplight, noise and the like is effectively avoided, and the influence on the surrounding environment and the life of citizens is reduced.
The slump of the concrete for the prefabricated part cannot be too large, otherwise, the damage such as edge collapse, bleeding and the like can occur; in order to ensure that the concrete has good workability, the concrete for the prefabricated parts needs better plasticity and lower viscosity, so that the general concrete cannot be used for preparing the prefabricated parts.
The phenomenon of volume shrinkage of concrete can appear in the initial stage of setting and the hardening in-process, especially when external environment temperature is higher, the moisture on concrete surface is very easily evaporated, and shrinkage problem is serious to lead to the concrete to produce the crack easily, influence the mechanical strength of concrete. Therefore, there is an urgent need to prepare a low shrinkage concrete, which prevents cracks from being generated in the concrete while securing mechanical strength of the concrete, and which is suitable for the preparation of prefabricated parts.
Disclosure of Invention
In order to prepare a low shrinkage concrete, to prevent cracks from being generated in the concrete while securing mechanical strength of the concrete, and to be suitable for a prefabricated part, the present application provides a low shrinkage concrete for a prefabricated part and a method of preparing the same.
In a first aspect, the application provides a low shrinkage concrete for prefabricated parts, which adopts the following technical scheme:
the low shrinkage concrete for the prefabricated parts comprises the following raw materials in parts by weight: 50-60 parts of pozzolan cement, 300-360 parts of Portland cement, 20-25 parts of waste hard plastic particles, 300-350 parts of sand, 200-300 parts of crushed stone, 200-250 parts of recycled aggregate, 300-350 parts of modified mineral powder, 10.5-11.6 parts of additive and 180-230 parts of water, wherein the recycled aggregate is a composition of fly ash recycled aggregate, reinforced concrete waste recycled aggregate and crushed concrete recycled aggregate according to a mass ratio of 5:2-3:3-4.
By adopting the technical scheme, the components of the application play different roles in the preparation of the low shrinkage concrete and cooperate to realize the effects of reducing the shrinkage of the concrete, preventing cracks from generating and simultaneously ensuring the mechanical strength of the concrete. The pozzolan cement and the silicate cement are matched, and the concrete has the advantage of low shrinkage by adjusting the activity of the compound cement, so that the pozzolan cement and the silicate cement: as a cementitious material, is used to cure concrete and provide strength, while pozzolans help reduce shrinkage of the concrete. Waste hard plastic particles: as a special additive, shrinkage and deformation of concrete can be reduced while increasing strength and durability of concrete. The plastic particles are small in volume, can fill in the gaps in the concrete, and interact with the cement bond. Sand: as aggregate for increasing the strength and stability of concrete while filling voids of the concrete. Broken stone: and is also an aggregate for increasing the strength and stability of concrete. With sand, a stronger concrete structure can be formed. Recycled aggregate: the composition of the fly ash recycled aggregate, the reinforced concrete waste recycled aggregate and the crushed concrete recycled aggregate is used, and the composition is the aggregate recycled by the waste materials. The recycled aggregate can reduce the demand for natural resources, improve the sustainability of concrete and reduce the production cost. Modified mineral powder: as a material for supplementing cement, the fluidity and durability of the concrete can be improved, and the early-stage and long-term strength of the concrete can be improved. Additive: is used for changing the characteristics of concrete, reducing shrinkage, increasing fluidity, improving durability and the like. Water: reacts with cement to form a gel, provides fluidity to the concrete and promotes the reaction of the material. In addition, the synergistic effect among the components is also the key for realizing low shrinkage concrete, and the waste hard plastic particles interact with cement bond to fill the pores in the concrete, reduce the shrinkage of the concrete and increase the strength and durability of the concrete. The recycled aggregate is used as a part of the aggregate, can fill the gaps in the concrete, reduces shrinkage and improves the strength of the concrete. In addition, the recycled aggregate can reduce the demand for natural resources and improve the sustainability of concrete. The combination of crushed stone and sand provides a better particle size distribution, enhancing the strength and stability of the concrete. Additive: the additive refers to a special chemical substance added into the concrete, and can change the performance of the concrete, such as prolonging the setting time of the concrete, improving the fluidity of the concrete, reducing shrinkage and the like. They react with cement to improve the workability and curing period characteristics of concrete. The components play a role in optimizing the performance of the concrete through interaction and synergism. By carefully adjusting and controlling the proportions of the components, the concrete can have low shrinkage, high strength, good durability and working performance.
Preferably, the mass ratio of the pozzolan cement to the portland cement is 1:6.
By adopting the technical scheme, the mass ratio of the pozzolan cement to the silicate cement is precisely controlled, the mutual synergistic effect between the pozzolan cement and the silicate cement is exerted, the setting and hardening process is accelerated, and the concrete is more uniform and stable. Pozzolan cement function: the pozzolanic cement is a common concrete admixture, has higher activity and fineness, and can increase the strength and durability of concrete. It can fill microscopic gaps in cement matrix, raise the compactness of hardened concrete and reduce permeation and gas permeability. In addition, the pozzolanic cement can promote early hydration reaction of concrete and accelerate the setting and hardening process. Portland cement function: portland cement is a common cementing material and has high fire resistance and sulfate erosion resistance. It can increase early and middle strength of concrete and raise its mechanical performance. Portland cement can also produce lower heat release, and lighten the generation of internal temperature stress of concrete. Synergistic effect of pozzolan cement and Portland cement: the mass ratio of pozzolan cement to portland cement of 1:6 is determined according to their respective characteristics and advantages. The proportion can fully play the advantages of two cements, and the overall performance and the cracking resistance of the concrete are improved. The pozzolan cement fills the gaps in the cement matrix and increases the density, while the portland cement increases the strength and durability of the concrete. They can also cooperate with each other to accelerate the setting and hardening process, making the concrete more uniform and stable.
Preferably, the recycled aggregate is a composition of fly ash recycled aggregate, reinforced concrete waste recycled aggregate and crushed concrete recycled aggregate according to a mass ratio of 5:2.2:3.3.
By adopting the technical scheme, the composition for precisely controlling the recycled aggregate to be the fly ash recycled aggregate, the reinforced concrete waste recycled aggregate and the crushed concrete recycled aggregate according to the mass ratio of 5:2.2:3.3 has the following effects and synergistic effects: reducing shrinkage of concrete: the introduction of the recycled aggregate can fill gaps in the concrete, and stress concentration caused by material shrinkage is reduced, so that the total shrinkage of the concrete is reduced. The mechanical strength of the concrete is improved: the reinforced concrete waste recycled aggregate and the crushed concrete recycled aggregate contain a large amount of coarse aggregate particles, so that the aggregate section of the concrete can be increased, and the overall strength and durability are improved. Improving the stability and durability of concrete: the fly ash recycled aggregate can fill the internal pores of the concrete, reduce the permeability of the concrete and improve the stability and durability of the concrete. The cost of concrete is reduced: the recycled aggregate is recycled by waste materials, and the recycled aggregate can reduce the dependence on natural resources and reduce the production cost of concrete. Synergistic effect: through the comprehensive use of the recycled aggregate, the advantages of various recycled aggregates can be fully exerted, the performance of the concrete is optimized, the shrinkage of the concrete is reduced, and the strength and stability of the concrete are enhanced. So that the low shrinkage concrete is more suitable for the production of prefabricated parts.
Preferably, the recycled aggregate of the fly ash is obtained by treating the coal combustion waste fly ash of a thermal power plant, the particle size is 2-15mm, the mass ratio of the recycled aggregate of the reinforced concrete waste is 40-60%, the mass ratio of the recycled aggregate of the reinforced concrete waste is 15-20%, the particle size is 2-20mm, the mass ratio of the recycled aggregate of the reinforced concrete waste is less than 5mm, the mass ratio of the recycled aggregate of the crushed concrete is 15-20%, the mass ratio of the recycled aggregate of the crushed concrete recycled aggregate is 2-20mm, and the mass ratio of the recycled aggregate of the reinforced concrete waste is less than 5mm is 15-20%.
Preferably, the modified mineral powder is a composition of basalt powder, quartz powder, kaolin powder and calcium powder according to the mass ratio of 1:1-3:2-4:0.5-0.8.
By adopting the technical scheme, the mineral powder has the effects of improving the mechanical property of the concrete and improving the working performance and durability of the concrete. Specifically, basalt powder can increase the compressive strength of concrete and reduce shrinkage. Quartz powder: the quartz powder is a silicate quartz powder with good activity and gelation properties. The quartz powder is added to increase the plasticity and fluidity of the concrete and reduce the water-cement ratio of the concrete, thereby reducing shrinkage deformation. Kaolin: kaolin is a powdery substance rich in kaolinite. The kaolin can improve the fluidity and crack resistance of the shrinkage concrete, reduce the shrinkage deformation of the concrete and improve the durability of the concrete. Calcium powder: the calcium powder is a fine powder cementing material and mainly consists of calcium hydroxide and magnesium oxide. The calcium powder can control the gelation rate of cement slurry of concrete and reduce the shrinkage deformation of the concrete. The modified mineral powder and other raw materials have synergistic effect, silicate gel is formed through the reaction of the modified mineral powder and cement, and the pores in the concrete are filled, so that the compactness and the impermeability of the concrete are improved. Meanwhile, the modified mineral powder can play a role in enhancing the compressive strength and durability of the concrete together with the pozzolanic cement and the silicate cement. In addition, the recycled aggregate, the modified mineral powder and the additive can also cooperate to ensure that the concrete has smaller shrinkage in the prefabrication process and prevent the concrete from generating cracks.
Preferably, the particle sizes of the basalt powder, the quartz powder, the kaolin powder and the calcium powder are all 3-10mm.
Through adopting above-mentioned technical scheme, inject basalt powder, quartz powder, kaolin powder and calcium powder particle diameter, be convenient for form the higher filling structure of density in concrete inner structure to improve concrete compactness, basalt powder, quartz powder, kaolin powder and calcium powder shrink less simultaneously, can further prevent the concrete shrink, make the concrete have higher mechanical strength when having low shrink effect.
Preferably, the waste hard plastic particles are waste POM polyformaldehyde plastic, PC polycarbonate plastic, AS acrylonitrile styrene plastic and PMMA polymethyl methacrylate plastic or the combination of one or more of the waste POM polyformaldehyde plastic, PC polycarbonate plastic, AS acrylonitrile styrene plastic and PMMA polymethyl methacrylate plastic, the waste POM polyformaldehyde plastic particles are crushed to the maximum particle size of below 15mm, and the particle size of the crushed stone is 5-15mm.
By adopting the technical scheme, the waste hard plastic particles are mixed with other raw materials for use, so that the preparation of the low-shrinkage concrete is realized. They may serve the following functions: filler action: the waste hard plastic particles can fill gaps in the concrete, so that the compactness of the concrete is improved, and the mechanical strength of the concrete is improved. The function of the inerting agent: the waste hard plastic particles can reduce the rate of cement hydration reaction and control the shrinkage of concrete. They chemically react with hydration products in the cement to form inerts, thereby reducing shrinkage of the concrete. Interface modification: the waste hard plastic particles can change the dispersion state of the particles in the concrete through the interface effect, so that the cracking resistance of the concrete is improved. The interaction between the concrete and other raw materials can increase the bonding strength of the concrete and prevent the generation and the expansion of cracks. Thermal stabilization: the waste hard plastic particles have good thermal stability, and can improve the temperature resistance of concrete. Under the high-temperature environment, the concrete can buffer the temperature change of the concrete and reduce shrinkage cracks caused by the temperature. The interaction of the waste hard plastic particles and other raw materials has a synergistic effect, so that the effects can be comprehensively exerted, and the performance of the concrete is improved. Limiting the waste plastic particles with the maximum particle diameter of below 15mm so as to achieve the best comprehensive effect.
Preferably, the additive is a composition of a water reducing agent, a shrinkage inhibitor and sodium lignin sulfonate according to a mass ratio of 10:2:3.
Through adopting above-mentioned technical scheme, the water-reducing agent is used for reducing the water cement ratio of concrete, improves the mobility, reduces the shrink of concrete and the emergence risk of crack. Shrinkage inhibitors are used to reduce shrinkage of concrete during hardening and to improve early strength and ductility of concrete. Sodium lignin sulfonate is a chemical admixture that improves the stability and strength of concrete by improving the adhesion and dispersion between cement particles. The additives are synergistic, the water reducing agent improves the fluidity of the concrete, the shrinkage inhibitor reduces the shrinkage of the concrete, the sodium lignin sulfonate enhances the bonding and the dispersibility among cement particles, the mechanical strength of the concrete is ensured together, and the cracking of the concrete is prevented.
Preferably, the water reducer is one or two of a polycarboxylic acid high-efficiency water reducer and a naphthalene high-efficiency water reducer, and the shrinkage inhibitor is a composition of calcium phosphate, calcium sulfite and hydrophobically modified alumina fiber cotton according to a mass ratio of 1:2:3.
By adopting the technical scheme, the water reducing agent has the effects of reducing the water cement ratio of the concrete, improving the fluidity and the plasticity of the concrete, and reducing the shrinkage of the concrete. Specifically, the polycarboxylic acid high-efficiency water reducer and the naphthalene high-efficiency water reducer can change the surface charge state of cement particles by adsorbing water molecules on the surfaces of the cement particles, reduce the friction force among the cement particles, enable concrete to flow and tap more easily, reduce evaporation of water and further reduce shrinkage of the concrete. The polycarboxylic acid high-efficiency water reducer and the naphthalene high-efficiency water reducer can have a synergistic effect. The polycarboxylic acid high-efficiency water reducer has better dispersibility and stability, reduces the surface tension of cement particles, and can improve the fluidity of concrete through the chemical action with the surfaces of the cement particles. The naphthalene-based superplasticizer plays a certain role in dispersing in concrete, and can reduce friction force among cement particles, thereby improving the fluidity of the concrete. Therefore, the synergistic effect of the polycarboxylic acid high-efficiency water reducer and the naphthalene high-efficiency water reducer in the concrete can obviously reduce the shrinkage of the concrete, and optimize the mechanical properties of the concrete, so that the concrete is more suitable for the production of prefabricated parts.
The combination of calcium phosphate, calcium sulfite and hydrophobically modified alumina fiber cotton acts as a shrinkage inhibitor. The shrinkage inhibitor has the function of preventing shrinkage of the concrete caused by evaporation of water during hardening, thereby avoiding cracking of the concrete. Calcium phosphate and calcium sulfite are commonly used as shrinkage inhibitors, which react with water in concrete to produce a certain amount of hydration products, filling voids in the concrete, thereby reducing shrinkage of the concrete. The hydrophobically modified alumina fiber cotton is a fiber reinforced material, and the toughness and the cracking resistance of the concrete can be improved by adding the fiber cotton. It can form fiber network structure, prevent crack propagation and raise the mechanical strength of concrete.
The combination of calcium phosphate, calcium sulfite and hydrophobically modified alumina fiber cotton has a synergistic effect. The hydrophobically modified alumina fiber cotton can provide fiber reinforcement effect and increase the crack resistance of concrete; and the calcium phosphate and the calcium sulfite can fill the gaps in the concrete, so that the shrinkage of the concrete is reduced. The comprehensive use of the shrinkage inhibitors can improve the overall performance of the concrete, not only can ensure the mechanical strength of the concrete, but also can prevent the shrinkage of the concrete from generating cracks, thereby being suitable for preparing prefabricated components.
In a second aspect, the application provides a method for preparing low shrinkage concrete for prefabricated parts, which adopts the following technical scheme:
a method for preparing low shrinkage concrete for prefabricated parts, the raw materials of the low shrinkage concrete for the prefabricated parts comprise the following steps:
s1, weighing volcanic ash cement, silicate cement, waste hard plastic particles and sand, and uniformly mixing and stirring to obtain a primary mixed material;
s2, weighing crushed stone, recycled aggregate and modified mineral powder, adding the crushed stone, the recycled aggregate and the modified mineral powder into the primary mixed material, and uniformly mixing and stirring to obtain a mixed material;
s3, weighing the additive and water, adding the additive and the water into the mixture, and uniformly mixing and stirring to prepare a concrete mixture;
s4, pouring the concrete mixture prepared in the step S3 into a mould for molding;
and S5, curing the concrete to a certain age to obtain the low-shrinkage concrete prefabricated part.
By adopting the technical scheme, the prepared concrete has low shrinkage, good mechanical strength and good impermeability, and the durability of the concrete can be improved.
In summary, the beneficial technical effects of the application are as follows:
1. the volcanic ash cement and the silicate cement are matched, and the concrete has the advantage of low shrinkage by adjusting the activity of the compound cement; the proportion of broken stone, recycled aggregate and sand is limited, so that the sand rate is controlled, and meanwhile, the mechanical strength of the concrete is ensured, so that the concrete has the advantage of low shrinkage; meanwhile, the shrinkage of the concrete is further prevented by utilizing waste hard plastic particles, modified mineral powder and additives; thereby preparing low shrinkage concrete, which can prevent the concrete from generating cracks and ensure the mechanical strength of the concrete, so that the low shrinkage concrete is more suitable for the production of prefabricated parts;
2. reduction of shrinkage problems: because of adding special shrinkage control agent and modifier, the concrete has lower shrinkage, and reduces shrinkage and cracking problems of the concrete in the drying and curing processes;
3. improving mechanical properties: the concrete has high strength and stability, and can meet the structural design and bearing requirements;
4. good durability: the concrete has excellent durability, can resist environmental corrosion, acid-base corrosion and chlorine salt corrosion, and prolongs the service life of the structure;
5. the construction cost is reduced: because of the use of the waste materials and the recycled aggregate, the cost of the concrete is lower than that of the traditional concrete, and the construction cost can be effectively reduced;
6. can be continuously utilized: the concrete is favorable for reducing resource consumption and environmental pollution by using the waste hard plastic particles and the recycled aggregate, and achieves the aim of sustainable development.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present application and should not be construed as limiting the scope of the present application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
A low shrinkage concrete for prefabricated parts: 50kg of pozzolan cement, 300kg of silicate cement, 20kg of waste hard plastic particles, 300kg of sand, 200kg of broken stone, 200kg of recycled aggregate, 300kg of modified mineral powder, 10.5kg of additive and 180kg of water, wherein the recycled aggregate is a composition of fly ash recycled aggregate, reinforced concrete waste recycled aggregate and crushed concrete recycled aggregate according to a mass ratio of 5:2:3, the fly ash recycled aggregate is a recycled aggregate obtained by treating coal waste fly ash of a thermal power plant, the particle size is 2-15mm, the mass ratio of less than 5mm is 40%, the reinforced concrete waste recycled aggregate is a recycled aggregate extracted from building waste, the particle size of 2-20mm, the mass ratio of less than 5mm is 15%, the crushed concrete recycled aggregate is a composition of basalt powder, quartz powder, kaolin powder and calcium powder according to a mass ratio of 1:1:2:0.5, and the mass ratio of basalt powder, the crushed concrete recycled aggregate is crushed basalt powder, the crushed quartz powder and the crushed powder is 10-10 mm. The waste hard plastic particles are waste POM polyformaldehyde plastic, the waste plastic particles with the maximum particle diameter of less than 15mm are crushed, and the particle diameter of broken stone is 5-15mm. The additive is a composition of a water reducing agent, a shrinkage inhibitor and sodium lignin sulfonate according to a mass ratio of 10:2:3. The water reducer is a polycarboxylic acid high-efficiency water reducer, and the shrinkage inhibitor is a composition of calcium phosphate, calcium sulfite and hydrophobically modified aluminum oxide fiber cotton according to a mass ratio of 1:2:3;
the preparation method comprises the following steps:
s1, weighing volcanic ash cement, silicate cement, waste hard plastic particles and sand, and uniformly mixing and stirring to obtain a primary mixed material;
s2, weighing crushed stone, recycled aggregate and modified mineral powder, adding the crushed stone, the recycled aggregate and the modified mineral powder into the primary mixed material, and uniformly mixing and stirring to obtain a mixed material;
s3, weighing the additive and water, adding the additive and the water into the mixture, and uniformly mixing and stirring to prepare a concrete mixture;
s4, pouring the concrete mixture prepared in the step S3 into a mould for molding;
and S5, curing the concrete for 7 days to obtain the low-shrinkage concrete prefabricated part.
Example 2
A low shrinkage concrete for prefabricated parts: 60kg of pozzolan cement, 360kg of silicate cement, 25kg of waste hard plastic particles, 350kg of sand, 300kg of crushed stone, 250kg of recycled aggregate, 350kg of modified mineral powder, 11.6kg of additive and 230kg of water, wherein the recycled aggregate is a composition of fly ash recycled aggregate, reinforced concrete waste recycled aggregate and crushed concrete recycled aggregate according to a mass ratio of 5:3:4, the fly ash recycled aggregate is a recycled aggregate obtained by treating coal waste fly ash of a thermal power plant, the particle size is 2-15mm, the mass ratio of less than 5mm is 60%, the reinforced concrete waste recycled aggregate is a recycled aggregate extracted from building waste, the particle size is 2-20mm, the mass ratio of less than 5mm is 20%, the particle size of the recycled aggregate obtained by crushing waste concrete is 2-20mm, the mass ratio of less than 5mm is 20%, the modified mineral powder is basalt powder, quartz powder, kaolin powder and calcium powder are a composition of basalt powder, basalt powder and quartz powder according to a mass ratio of 1:3:2-4:0.8, and the particle size of the basalt powder is 3-10mm. The waste hard plastic particles are waste plastic particles with the maximum particle diameter of less than 15mm and crushed stone with the particle diameter of 5-15mm. The additive is a composition of a water reducing agent, a shrinkage inhibitor and sodium lignin sulfonate according to a mass ratio of 10:2:3. The water reducer is a composition of naphthalene high-efficiency water reducer shrinkage inhibitor which is calcium phosphate, calcium sulfite and hydrophobically modified aluminum oxide fiber cotton according to a mass ratio of 1:2:3.
The preparation method comprises the following steps:
s1, weighing volcanic ash cement, silicate cement, waste hard plastic particles and sand, and uniformly mixing and stirring to obtain a primary mixed material;
s2, weighing crushed stone, recycled aggregate and modified mineral powder, adding the crushed stone, the recycled aggregate and the modified mineral powder into the primary mixed material, and uniformly mixing and stirring to obtain a mixed material;
s3, weighing the additive and water, adding the additive and the water into the mixture, and uniformly mixing and stirring to prepare a concrete mixture;
s4, pouring the concrete mixture prepared in the step S3 into a mould for molding;
and S5, curing the concrete for 10 days to obtain the low-shrinkage concrete prefabricated part.
Example 3
A low shrinkage concrete for prefabricated parts: 55kg of pozzolan cement, 330kg of silicate cement, 23kg of waste hard plastic particles, 330kg of sand, 250kg of crushed stone, 230kg of recycled aggregate, 320kg of modified mineral powder, 11kg of additive and 200kg of water, wherein the recycled aggregate is a composition of fly ash recycled aggregate, reinforced concrete waste recycled aggregate and crushed concrete recycled aggregate according to a mass ratio of 5:2.2:3.3. The recycled aggregate of the fly ash is obtained by treating coal combustion waste fly ash of a thermal power plant, the particle size is 2-15mm, the mass ratio of the recycled aggregate of the reinforced concrete waste is less than 5mm and is 50%, the recycled aggregate of the reinforced concrete waste is extracted from building waste, the particle size is 2-20mm, the mass ratio of the recycled aggregate of the reinforced concrete waste is less than 5mm and is 18%, the recycled aggregate of the crushed concrete recycled aggregate is obtained by crushing waste concrete, the particle size is 2-20mm, the mass ratio of the recycled aggregate of the crushed concrete waste is less than 5mm and is 18%, the modified mineral powder is a composition of basalt powder, quartz powder, kaolin powder and calcium powder according to the mass ratio of 1:1-3:2-4:0.5-0.8, and the particle sizes of the basalt powder, the quartz powder and the kaolin powder are all 3-10mm. The waste hard plastic particles are waste plastic particles with the maximum particle diameter of less than 15mm and crushed stone particle diameter of 5-15mm. The additive is a composition of a water reducing agent, a shrinkage inhibitor and sodium lignin sulfonate according to a mass ratio of 10:2:3. The water reducer is a composition of a polycarboxylic acid high-efficiency water reducer and a naphthalene high-efficiency water reducer according to a mass ratio of 1:1, and the shrinkage inhibitor is a composition of calcium phosphate, calcium sulfite and hydrophobically modified alumina fiber cotton according to a mass ratio of 1:2:3.
The preparation method comprises the following steps:
s1, weighing volcanic ash cement, silicate cement, waste hard plastic particles and sand, and uniformly mixing and stirring to obtain a primary mixed material;
s2, weighing crushed stone, recycled aggregate and modified mineral powder, adding the crushed stone, the recycled aggregate and the modified mineral powder into the primary mixed material, and uniformly mixing and stirring to obtain a mixed material;
s3, weighing the additive and water, adding the additive and the water into the mixture, and uniformly mixing and stirring to prepare a concrete mixture;
s4, pouring the concrete mixture prepared in the step S3 into a mould for molding;
and S5, curing the concrete for 14 days to obtain the low-shrinkage concrete prefabricated part.
Example 4
The same as in example 3, except that: the waste hard plastic particles are waste plastic particles obtained by crushing waste PMMA polymethyl methacrylate plastic to a maximum particle size of below 15mm.
Example 5
The same as in example 3, except that: the waste hard plastic particles are waste POM polyformaldehyde plastic, waste PC polycarbonate plastic, waste AS acrylonitrile styrene plastic and waste PMMA polymethyl methacrylate plastic, wherein the waste hard plastic particles are waste plastic particles with the maximum particle diameter of below 15mm, and the waste POM polyformaldehyde plastic, the waste PC polycarbonate plastic, the waste AS acrylonitrile styrene plastic and the waste PMMA polymethyl methacrylate plastic are crushed according to the mass ratio of 1:2:1:1.
Comparative example 1
The same as in example 5, except that: the modified mineral powder is 320kg of quartz powder, and the particle size of the quartz powder is 3-10mm.
Comparative example 2
The same as in example 5, except that: the modified mineral powder is 320kg of basalt powder, and the particle size of the basalt powder is 3-10mm.
Comparative example 3
The same as in example 5, except that: the modified mineral powder is 320kg of kaolin powder, and the particle size of the kaolin powder is 3-10mm.
Comparative example 4
The same as in example 5, except that: the modified mineral powder is 320kg of calcium powder, and the particle size of the calcium powder is 3-10mm.
Comparative example 5
The same as in example 5, except that: the shrinkage inhibitor is calcium phosphate of equal quality.
Comparative example 6
The same as in example 5, except that: the shrinkage inhibitor is calcium sulfite with the same quality.
Comparative example 7
The same as in example 5, except that: the shrinkage inhibitor is hydrophobically modified alumina fiber cotton with the same quality.
Performance testing
1. Mechanical strength detection
Concrete was prepared by the preparation methods of example 15 and comparative example 17, and standard test blocks were prepared with reference to GB/T500812019 Standard for physical and mechanical Properties test method of concrete, and the compressive strength of cured 28d was measured and data recorded.
2. Crack resistance detection
The concrete was prepared by the preparation methods of examples 1 to 5 and comparative examples 1 to 7, respectively, standard test blocks were prepared with reference to GB/T50081-2019 Standard for test method of physical and mechanical Properties of concrete, curing was conducted at 40℃in an outdoor environment, the number of cracks on the concrete surface after curing was recorded for 28 days, the number of cracks per unit area was obtained, and data was recorded.
3. Shrinkage performance test concrete was prepared by the preparation methods of example 15 and comparative example 17, standard test blocks were prepared with reference to GB/T50081-2019 Standard for test method for physical mechanical Properties of concrete, cured at 40℃in outdoor Environment, and shrinkage data for 28d were recorded with reference to GB/T50082-2009 Standard for test method for Long-term Properties and durability of ordinary concrete.
Table 1 performance test table
As can be seen from the combination of example 15 and table 1, the concrete prepared according to the present application has the advantages of higher mechanical strength and lower shrinkage, and has excellent crack resistance.
AS can be seen from the combination of the example 5 and the combination of the example 14 and the table 1, the waste hard plastic particles are waste POM polyoxymethylene plastic, waste PC polycarbonate plastic, waste AS acrylonitrile styrene plastic and waste PMMA polymethyl methacrylate plastic, and the composition of the waste AS acrylonitrile styrene plastic, waste PMMA polymethyl methacrylate plastic and waste AS polycarbonate plastic is better than the composition of the waste POM polyoxymethylene plastic, waste PC polycarbonate plastic, waste AS acrylonitrile styrene plastic and waste PMMA polymethyl methacrylate plastic in mass ratio of 1:2:1:1, and the waste hard plastic particles have a synergistic effect, and the dispersion state of the particles in the concrete is changed through the interface effect, so that the cracking resistance of the concrete is improved. The interaction between the modified and modified epoxy resin and other raw materials can increase the bonding strength of the concrete, prevent the generation and the expansion of cracks, improve the temperature resistance of the concrete, buffer the temperature change of the concrete and reduce shrinkage cracks caused by the temperature in a high-temperature environment.
As can be seen from the combination of example 5 and comparative examples 1 to 4 and the combination of table 1, the composition of the modified mineral powder, basalt powder, quartz powder, kaolin powder and calcium powder in the mass ratio of 1:1 to 3:2 to 4:0.5 to 0.8 is more excellent in cracking resistance and shrinkage resistance than the basalt powder, quartz powder, kaolin powder and calcium powder which are the independent components, because of the synergistic effect between the combined modified mineral powder and other raw materials, silicate gel is formed by the reaction of the modified mineral powder and cement, and the pores in the concrete are filled, so that the compactness and the impermeability of the concrete are improved. Meanwhile, the combined modified mineral powder can play a role in enhancing the compressive strength and durability of the concrete together with the volcanic ash cement and the silicate cement. In addition, the recycled aggregate, the modified mineral powder and the additive can also cooperate to ensure that the concrete has smaller shrinkage in the prefabrication process and prevent the concrete from generating cracks.
It can be seen from the combination of example 5 and comparative examples 5 to 7 and the combination of table 1 that the shrinkage inhibitor is a composition of calcium phosphate, calcium sulfite, hydrophobically modified alumina fiber cotton in a mass ratio of 1:2:3, which is superior to the crack resistance and shrinkage performance of calcium phosphate, calcium sulfite, hydrophobically modified alumina fiber cotton alone because the composition of calcium phosphate, calcium sulfite and hydrophobically modified alumina fiber cotton acts as the shrinkage inhibitor. The shrinkage inhibitor has the function of preventing shrinkage of the concrete caused by evaporation of water during hardening, thereby avoiding cracking of the concrete. Calcium phosphate and calcium sulfite are commonly used as shrinkage inhibitors, which react with water in concrete to produce a certain amount of hydration products, filling voids in the concrete, thereby reducing shrinkage of the concrete. The hydrophobically modified alumina fiber cotton is a fiber reinforced material, and the toughness and the cracking resistance of the concrete can be improved by adding the fiber cotton. It can form fiber network structure, prevent crack propagation and raise the mechanical strength of concrete. The composition of the calcium phosphate, the calcium sulfite and the hydrophobically modified alumina fiber cotton has a synergistic effect, and the hydrophobically modified alumina fiber cotton can provide a fiber reinforcing effect and increase the cracking resistance of the concrete; and the calcium phosphate and the calcium sulfite can fill the gaps in the concrete, so that the shrinkage of the concrete is reduced. The comprehensive use of the shrinkage inhibitors can improve the overall performance of the concrete, not only can ensure the mechanical strength of the concrete, but also can prevent the shrinkage of the concrete from generating cracks, thereby being suitable for preparing prefabricated components.
The above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the above embodiments specifically illustrate the present application, it should be understood by those skilled in the art that modifications and equivalents may be made to the specific embodiments of the present application without departing from the spirit and scope of the present application, and any modifications and equivalents are intended to be covered by the scope of the claims of the present application.
Claims (10)
1. The low shrinkage concrete for the prefabricated parts is characterized by comprising the following raw materials in parts by weight: 50-60 parts of pozzolan cement, 300-360 parts of Portland cement, 20-25 parts of waste hard plastic particles, 300-350 parts of sand, 200-300 parts of crushed stone, 200-250 parts of recycled aggregate, 300-350 parts of modified mineral powder, 10.5-11.6 parts of additive and 180-230 parts of water, wherein the recycled aggregate is a composition of fly ash recycled aggregate, reinforced concrete waste recycled aggregate and crushed concrete recycled aggregate according to a mass ratio of 5:2-3:3-4.
2. A low shrinkage concrete for prefabricated parts according to claim 1, wherein the mass ratio of the pozzolan cement to the portland cement is 1:6.
3. The low shrinkage concrete for prefabricated parts according to claim 1, wherein the recycled aggregate is a composition of fly ash recycled aggregate, reinforced concrete waste recycled aggregate, crushed concrete recycled aggregate according to a mass ratio of 5:2.2:3.3.
4. A low shrinkage concrete for prefabricated parts according to claim 1 or 3, wherein the fly ash recycled aggregate is recycled aggregate obtained by treating fly ash, which is a waste of coal combustion in a thermal power plant, with a particle diameter of 215mm and a mass ratio of less than 5mm of 4060%, the reinforced concrete waste recycled aggregate is recycled aggregate extracted from construction waste with a particle diameter of 220mm and a mass ratio of less than 5mm of 1520%, and the crushed concrete recycled aggregate is recycled aggregate obtained by crushing waste concrete with a particle diameter of 220mm and a mass ratio of less than 5mm of 1520%.
5. The low shrinkage concrete for prefabricated parts according to claim 1, wherein the modified mineral powder is a composition of basalt powder, quartz powder, kaolin powder and calcium powder according to a mass ratio of 1:1-3:2-4:0.5-0.8.
6. The low shrinkage concrete for prefabricated parts according to claim 5, wherein the basalt powder, the quartz powder, the kaolin powder and the calcium powder have a particle size of 310mm.
7. The low shrinkage concrete for prefabricated parts according to claim 1, wherein the waste hard plastic particles are waste plastic particles with a maximum particle diameter of 15mm or less, and the crushed stone has a particle diameter of 515mm, wherein the waste hard plastic particles are one or a combination of a plurality of waste POM polyoxymethylene plastic, waste PC polycarbonate plastic, waste AS acrylonitrile styrene plastic and waste PMMA polymethyl methacrylate plastic.
8. The low shrinkage concrete for prefabricated parts according to claim 1, wherein the additive is a composition of a water reducing agent, a shrinkage inhibitor and sodium lignin sulfonate according to a mass ratio of 10:2:3.
9. The low shrinkage concrete for prefabricated parts according to claim 8, wherein the water reducer is one or two of a polycarboxylic acid high efficiency water reducer and a naphthalene high efficiency water reducer, and the shrinkage inhibitor is a composition of calcium phosphate, calcium sulfite and hydrophobically modified alumina fiber cotton according to a mass ratio of 1:2:3.
10. A method for preparing a low shrinkage concrete for a prefabricated part, wherein a raw material for a low shrinkage concrete for a prefabricated part according to any one of claims 19 is used, comprising the steps of:
s1, weighing volcanic ash cement, silicate cement, waste hard plastic particles and sand, and uniformly mixing and stirring to obtain a primary mixed material;
s2, weighing crushed stone, recycled aggregate and modified mineral powder, adding the crushed stone, the recycled aggregate and the modified mineral powder into the primary mixed material, and uniformly mixing and stirring to obtain a mixed material;
s3, weighing the additive and water, adding the additive and the water into the mixture, and uniformly mixing and stirring to prepare a concrete mixture;
s4, pouring the concrete mixture prepared in the step S3 into a mould for molding;
and S5, curing the concrete to a certain age to obtain the low-shrinkage concrete prefabricated part.
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