CN115745514A - Modified regenerated clear water concrete and preparation method thereof - Google Patents
Modified regenerated clear water concrete and preparation method thereof Download PDFInfo
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- CN115745514A CN115745514A CN202211463416.8A CN202211463416A CN115745514A CN 115745514 A CN115745514 A CN 115745514A CN 202211463416 A CN202211463416 A CN 202211463416A CN 115745514 A CN115745514 A CN 115745514A
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- 239000004567 concrete Substances 0.000 title claims abstract description 99
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229910001868 water Inorganic materials 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 76
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000003607 modifier Substances 0.000 claims abstract description 53
- 239000000835 fiber Substances 0.000 claims abstract description 36
- 239000002956 ash Substances 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 28
- 239000010881 fly ash Substances 0.000 claims abstract description 27
- 239000002699 waste material Substances 0.000 claims abstract description 26
- 239000004576 sand Substances 0.000 claims abstract description 25
- 239000002893 slag Substances 0.000 claims abstract description 25
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 23
- 239000011707 mineral Substances 0.000 claims abstract description 23
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 23
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 239000004575 stone Substances 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 14
- 238000005336 cracking Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 70
- 239000000243 solution Substances 0.000 claims description 59
- 244000068988 Glycine max Species 0.000 claims description 27
- 235000010469 Glycine max Nutrition 0.000 claims description 27
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 26
- 235000013312 flour Nutrition 0.000 claims description 21
- 239000004115 Sodium Silicate Substances 0.000 claims description 19
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 19
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 18
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 17
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 17
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 17
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 16
- 239000004202 carbamide Substances 0.000 claims description 16
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 14
- 239000001110 calcium chloride Substances 0.000 claims description 14
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 238000005303 weighing Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 11
- 229920002748 Basalt fiber Polymers 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000012783 reinforcing fiber Substances 0.000 claims description 7
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 6
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims description 6
- 239000012153 distilled water Substances 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000010882 bottom ash Substances 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 239000004566 building material Substances 0.000 claims description 2
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 2
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 2
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 2
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 239000007800 oxidant agent Substances 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000010301 surface-oxidation reaction Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 235000013339 cereals Nutrition 0.000 claims 1
- 239000012528 membrane Substances 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 24
- 238000010276 construction Methods 0.000 abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 17
- 244000046052 Phaseolus vulgaris Species 0.000 description 15
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 7
- 238000010030 laminating Methods 0.000 description 7
- 235000019353 potassium silicate Nutrition 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000011049 filling Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 239000010754 BS 2869 Class F Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 208000034189 Sclerosis Diseases 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Classifications
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- 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
Abstract
The invention discloses a modified regenerated fair-faced concrete and a preparation method thereof, wherein the modified regenerated fair-faced concrete comprises the following raw materials: 180-200 parts of water, 320-360 parts of cement, 365-390 parts of sea sand, 460-490 parts of broken stone, 460-490 parts of modified recycled coarse aggregate, 40-60 parts of recycled micro powder, 40-60 parts of fly ash, 40-60 parts of mineral powder, 365-390 parts of slag ash, 1-2 parts of anti-cracking reinforced composite fiber, 6.9 parts of nano silicon dioxide, 4.6 parts of water reducing agent, 2 parts of defoaming agent and 2 parts of water-retaining agent. The modified recycled coarse aggregate is obtained by treating recycled coarse aggregate with a surface modifier A and a surface modifier B. The invention uses the modified and regenerated waste, adds the anti-cracking reinforced composite fiber, has good strength and apparent quality, can achieve the decorative effect without subsequent surface processing, has the advantage of environmental protection, and effectively reduces the carbon emission and the construction cost.
Description
Technical Field
The invention belongs to concrete Cheng Lingyu, and particularly relates to modified recycled fair-faced concrete and a preparation method thereof.
Background
The bare concrete can be used as a decorative surface after one-step forming, not only has excellent surface quality, but also is beneficial to saving cost because the subsequent decorative and repairing processes are reduced, and is a very promising architectural artistic expression.
With the vigorous development of the construction industry, new buildings continuously appear, old buildings are inevitably dismantled and rebuilt, a large amount of construction wastes are generated in the process, and the treatment of the construction wastes is a great problem. The regenerated solid waste concrete is hot tide in the concrete technical industry, and the carbon fixation and emission reduction effects can be achieved by applying the construction waste recycled aggregate and the recycled micro powder to the construction of concrete engineering. However, the recycled aggregate has a larger number of old mortar and microcracks adhered to the surface and has physical and mechanical properties slightly better than those of natural aggregate. The recycled aggregate can be subjected to surface modification by soaking in the solution, so that the crushing value and the water absorption rate of the recycled aggregate are reduced, and the apparent density of the recycled aggregate is improved, so that the strength and the durability of recycled concrete are further improved.
The recycled concrete and the fair-faced concrete are combined together, so that the construction waste is effectively treated, the effects of carbon fixation and emission reduction are achieved, the facing effect of the fair-faced concrete is met, the subsequent decoration process is omitted, the cost-saving effect is achieved, and great contribution is made to the construction of an environment-friendly and resource-saving society.
Disclosure of Invention
The invention aims to provide modified recycled fair-faced concrete and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
the feed comprises the following raw materials in parts by weight: 180-200 parts of water, 320-360 parts of cement, 40-60 parts of regenerated micro powder, 40-60 parts of fly ash, 40-60 parts of mineral powder, 365-390 parts of slag ash, 365-390 parts of sea sand, 460-490 parts of broken stone, 460-490 parts of modified regenerated coarse aggregate, 1-2 parts of anti-cracking reinforced composite fiber, 6.9 parts of nano silicon dioxide, 4.6 parts of water reducing agent, 2 parts of defoaming agent and 2 parts of water-retaining agent; the modified recycled coarse aggregate is obtained by treating recycled coarse aggregate with a surface modifier A and a surface modifier B;
the surface modifier A is a mixed solution consisting of soybean powder clear liquid, urea, calcium chloride and polyvinylpyrrolidone according to a mass ratio of 10; the surface modifier B is prepared from a sodium silicate solution and polyvinyl butyral according to a mass ratio of 9:1 are mixed.
Preferably, the sea sand and the slag ash together constitute a fine aggregate, and the sand rate of the fine aggregate is 44%. In the modified recycled clear water concrete, the water-to-cement ratio is 0.40.
Preferably, the slag ash is derived from bottom ash obtained after refuse incineration, and is sieved by a 5mm square-hole sieve, and the part with the particle size of less than 5mm is collected as fine aggregate.
Preferentially, the fineness modulus of the sea sand is 3.0-2.3, and the mud content is less than or equal to 0.4%. The fineness modulus of the slag ash is 3.0-2.3, and the content of Cl element is less than or equal to 10%. The slag ash is derived from incineration bottom ash collected by a waste incineration power plant, has certain volcanic ash activity, can obviously improve the utilization rate of solid waste when being doped into concrete as fine aggregate, can keep good mechanical property, and is environment-friendly solid waste.
Preferentially, the recycled coarse aggregate is selected according to 5.0-31.5 mm continuous gradation after being crushed by C40 common concrete test blocks, and the recycled micro powder is crushed by C30 common concrete test blocks and then is subjected to negative pressure to collect particles with the particle size of less than 0.075 mm. The recycled aggregate and the recycled micro powder can reduce the use amount of the traditional aggregate and cementing material and reduce carbon emission.
Preferably, the nominal particle size of the crushed stone is 5.0-37.5 mm, the nominal particle size of the recycled coarse aggregate is 5.0-31.5 mm, and the mud content of the crushed stone and the recycled coarse aggregate is less than or equal to 0.4%.
Preferably, the mixing amount of the regenerated micro powder is 10%, the mixing amount of the mineral powder is 10% and the mixing amount of the fly ash is 10%.
Preferably, the cement strength grade is not less than 42.5 grade portland cement.
Preferably, the fly ash is class F class I fly ash which meets the GB/T1596-2017 fly ash for cement and concrete standard.
Preferably, the ore powder is grade S105 ore powder meeting the GB/T18046-2000 granulated blast furnace slag powder for cement and concrete. The mineral powder and the fly ash as high-activity mineral admixtures can reduce bubbles and improve homogeneity, so that the appearance quality of the fair-faced concrete is improved.
Preferably, the sodium silicate solution (water glass) has a mass fraction of 15%, a water glass modulus of 3.3 and a baume degree of 38.5Be.
Preferably, the average particle size of the nano silicon dioxide is 28-250 nm, and the purity is more than or equal to 99.8%. The nano silicon dioxide can play a volcanic ash effect, a nucleation effect and a filling effect in concrete, increase cement hydration products, improve the cementing property of a matrix, fill pores and microcracks, and improve the strength and durability of the concrete.
Preferably, the anti-cracking reinforcing fibers are prepared from basalt fibers and waste woven bag broken fibers in a mass ratio of 1: 1. Wherein the length of the basalt fiber is 9-12 mm, the diameter is 13-15 μm, the tensile strength is 4150-4750 MPa, the elastic modulus is 95-120 GPa, and the elongation is 3.1%. The broken fiber raw material of the waste woven bag is taken from the woven bag containing building materials such as cement, fly ash and the like. And (3) opening the waste woven bags by using an opener to obtain waste woven bag fibers with the length of 12-18mm and the diameter of 15-18 mu m. Soaking the waste woven bag fiber in acetone solution for 4-6h, then cleaning with distilled water for 2-4 times, drying in an oven at 50-60 deg.C to constant weight, and then using potassium dichromate (K) 2 Cr 2 O 7 ) Sulfuric acid (H) 2 SO 4 ) And distilled water (H) 2 O) carrying out surface oxidation modification treatment on the woven bag fiber by using the combined chemical oxidant: at the temperature of 80 ℃, potassium dichromate (K) is added 2 Cr 2 O 7 ) And sulfuric acid (H) 2 SO 4 ) And water (H) 2 O) according to the mass ratio of 6:90:7 preparing chromic acid solution, adding the woven bag fiber into the chromic acid solution, wherein the mass of the waste woven bag fiber accounts for 30-40% of that of the chromic acid solution, and the soaking time is 10-15min. And then washing the reacted waste woven bag fibers for 4-6 times by using an acetone solution, and drying in an oven at 50-60 ℃ to constant weight. After the waste woven bag fibers are subjected to oxidation treatment, the hydrophilicity and the surface roughness are improved, the interweaving capability of the fibers is enhanced, and the dispersibility in a cement-based material is improved.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent, the water reducing agent is liquid, and the solid content is 50%. The polycarboxylate superplasticizer has good dispersibility and slump retention in the actual construction process, and improves the workability of slurry so as to improve the surface quality of the fair-faced concrete.
Preferably, the defoaming agent is organic silicon modified polyether, is in a liquid state, and has the water content less than or equal to 1 percent. The organic silicon modified polyether defoamer has strong foam inhibition capability, and improves the compactness of a concrete matrix.
Preferably, the water retention agent is hydroxypropyl methylcellulose, is white powder, and has excellent quality grade. The water-retaining agent can obviously improve the capacity of concrete slurry for keeping effective water.
Preferably, the bean flour is obtained by crushing commercially available fresh soybeans, crushing the fresh soybeans into powder by a crusher, and then sieving the bean flour by a 0.25mm square-hole sieve.
The preparation method of the modified recycled fair-faced concrete comprises the following steps:
1) Weighing the following components in a mass ratio of 10:3:3:1, preparing a surface modifier A from the clear bean flour solution, urea, calcium chloride and polyvinylpyrrolidone, preparing a bean flour solution from the clear bean flour solution according to 100g/L, putting the bean flour solution into an airflow stirring tank, introducing compressed nitrogen into the airflow stirring tank, and performing airflow stirring for 3-5min, wherein the air flow is 0.1-0.2m 3 /(min·m 2 ) Then, the mixture was centrifuged at 4000rpm for 30min in a centrifuge, and then filtered with a 0.45 μm filter to obtain a clear solution of soybean powder. Adding urea, calcium chloride powder and polyvinylpyrrolidone into the clear liquid of bean flourThe mixture was stirred at 30rpm for 30 minutes and allowed to stand for 1d (1 day). And soaking the recycled coarse aggregate in the surface modifier A for 1d. The soybean flour contains soybean flour enzyme, urea can be hydrolyzed to generate carbonate ions, calcium carbonate precipitates can be generated by combining with calcium ions in a solution, the generated calcium carbonate precipitates can be adhered to the surface of a regenerated aggregate to play the roles of repairing cracks and filling pores, and the polyvinylpyrrolidone can improve the cohesiveness between the calcium carbonate precipitates and the regenerated aggregate, so that the crushing value and the water absorption of the regenerated aggregate are reduced, the soybean flour can be fully dissolved in the solution in a short time by using airflow stirring, and the problem of deterioration of the soybean flour due to long-term placement is avoided.
2) Weighing the following components in a mass ratio of 9:1, magnetically stirring the sodium silicate solution and the polyvinyl butyral at the constant temperature of 40 ℃ for 30-50min, wherein the stirring speed is 30-40rpm. Uniformly dispersing polyvinyl butyral in a sodium silicate solution, then placing the primarily modified recycled coarse aggregate soaked in the surface modifier A into a surface modifier B consisting of the sodium silicate solution and the polyvinyl butyral, standing for 1d, filtering, and naturally drying to obtain the final modified recycled aggregate.
The recycled aggregate primarily modified by the surface modifier A is soaked in the surface modifier B, a sodium silicate solution can form a layer of water glass film on the surface of the recycled aggregate to further reduce the water absorption rate of the aggregate, and the polyvinyl butyral can improve the cohesiveness of the water glass film and the recycled aggregate, which is very important for the fair-faced concrete. The surface modifier A is modified to fill gaps, cracks and holes on the surface of the recycled aggregate at a lower cost, and the surface modifier B further reduces the water absorption of the recycled aggregate, so that the fluidity of the recycled aggregate concrete is improved, the strength and the durability are improved, and the working performance of the recycled concrete can be maintained.
3) Adding nano silicon dioxide, a water reducing agent, a defoaming agent and a water-retaining agent into water, premixing and stirring, heating to 60 ℃ at the rotating speed of 30rpm, stirring for 30min, then adding cement, regenerated micro powder, mineral powder and fly ash into a nano silicon dioxide solution, stirring into a prepolymer, adding sea sand, slag ash and anti-crack fibers, stirring, finally adding modified regenerated coarse aggregate and broken stone, mixing and stirring into concrete slurry. And pouring the stirred concrete slurry, vibrating by using a vibrating rod, and then laminating and curing to obtain the modified recycled fair-faced concrete.
The nano particles can well fill pores and microcracks in concrete due to good filling effect, nucleation effect and surface effect of the nano particles, so that a microstructure becomes compact, the macroscopic mechanical property and durability of the concrete are improved, in addition, the nano silicon dioxide also has high volcanic ash effect, and secondary hydration reaction is carried out on the nano silicon dioxide, sodium hydroxide and water in an alkaline environment in the fresh concrete slurry to generate hydrated sodium silicate, so that the hydration of cement paste is promoted, and the strength and durability of recycled concrete are improved to a great extent.
The addition of the mineral powder and the fly ash can improve the slump loss and the workability of the concrete, reduce the possibility of segregation and bleeding of the concrete, achieve the aim of improving the early construction performance of the fair-faced concrete, reduce the electric flux of the concrete, improve the 28-day compressive strength and improve the structural safety of the fair-faced concrete.
The basalt fiber is not easy to rust, and is relatively close to the linear expansion coefficient and density of concrete, so that the basalt fiber can be tightly combined with a matrix when being doped into the concrete matrix, the compressive strength, the splitting tensile strength and the elastic modulus of the concrete are effectively improved, and the basalt fiber is added to make a great contribution to improving the strength grade of the modified and regenerated fair-faced concrete. The waste woven bag broken fiber is low-cost and non-toxic fiber, and has the advantages of wide source, strong chemical stability, tensile strength and good toughness. The solid waste can be effectively utilized by using the broken fiber of the waste woven bag, and the effects of energy conservation and low carbon are achieved.
Because some templates can not in time discharge the moisture and the bubble on fair-faced concrete thick liquids surface, consequently the sclerosis can inevitably produce bubble, sand hole and crackle, uses the defoaming agent can reduce the bubble on concrete thick liquids surface, reaches the neat and uniform effect of fair-faced concrete veneer effect.
The invention has the following beneficial effects:
1. according to the invention, the surface modifier A and the surface modifier B are used for sequentially carrying out surface modification on the regenerated coarse aggregate, calcium carbonate ions generated by enzyme hydrolysis of urea of bean flour and calcium ions generate calcium carbonate precipitates to fill pores and microcracks on the surface of the aggregate, polyvinylpyrrolidone can improve the adhesion between the calcium carbonate precipitates and the regenerated aggregate, the crushing value of the regenerated aggregate is reduced, a layer of film is generated on the surface of the regenerated aggregate by a sodium silicate solution, the water absorption of the regenerated aggregate is greatly reduced, the adhesion between a water glass film and the regenerated aggregate can be improved by polyvinyl butyral, the workability of the freshly-mixed regenerated fair-faced concrete is ensured, and the facing effect of the fair-faced concrete is improved.
2. According to the invention, the nano silicon dioxide is added into the concrete, the pores and microcracks in the recycled concrete matrix are filled by utilizing the filling effect, the nucleation effect, the surface effect and the volcanic ash effect of the nano silicon dioxide, and the nano silicon dioxide and the sodium hydroxide and the water in the concrete are subjected to secondary hydration reaction to generate hydrated sodium silicate, so that the concrete can be fully hydrated, and the strength and the durability are further improved.
3. The basalt fiber and the waste woven bag fiber defoaming agent are added into the concrete, so that the basalt fiber is good in toughness, good in chemical stability and corrosion resistant, and meanwhile, the linear expansion coefficient and the density of the basalt fiber are very close to those of the concrete, so that the basalt fiber and the concrete are tightly combined, and the strength and the elastic modulus of the concrete are effectively improved. The waste woven bags subjected to oxidation treatment have high fiber hydrophilicity and surface roughness, the fiber interweaving capability is high, and the dispersibility of the fibers in the cement-based material is improved. The defoaming agent eliminates bubbles on the surface of fresh concrete, avoids the generation of phenomena such as sand holes, bubbles, cracks and the like on the surface of the fair-faced concrete, and improves the surface quality.
4. The method uses the recycled waste recycled aggregate, the recycled micro powder, the slag ash and the waste woven bag crushed fiber to prepare the fair-faced concrete, reduces the usage amount of the primary material, reduces the use cost while protecting environmental resources, and achieves the effects of carbon sequestration and emission reduction.
Detailed Description
Example 1
A: the raw materials are weighed according to the mixture ratio of 192 parts of water, 330 parts of cement, 40 parts of regenerated micro powder, 50 parts of fly ash, 60 parts of mineral powder, 390 parts of sea sand, 365 parts of slag ash, 460 parts of broken stone, 490 parts of regenerated coarse aggregate, 1.5 parts of anti-cracking reinforced fiber, 6.9 parts of nano silicon dioxide, 4.6 parts of water reducing agent, 2 parts of water-retaining agent and 2 parts of defoaming agent.
Weighing the following components in a mass ratio of 10:3:3:1, urea, calcium chloride and polyvinylpyrrolidone to form a surface modifier A. Preparing bean powder solution with 100g/L clear water, placing the bean powder solution into a gas flow stirring tank, introducing compressed nitrogen gas, and stirring for 3-5min with gas flow of 0.1-0.2m 3 /(min·m 2 ) Then, the mixture was centrifuged at 4000rpm for 30min in a centrifuge, left to stand for 1d, and then filtered with a 0.45 μm filter to obtain a clear solution of soybean powder. And (3) adding urea, calcium chloride powder and polyvinylpyrrolidone into the clear liquid of the soybean flour, and stirring for 30 minutes at the rotating speed of 30rpm to obtain the surface modifier A. And (3) soaking the recycled coarse aggregate in the surface modifier A for 1d, and then taking out the recycled coarse aggregate. Weighing the following components in a mass ratio of 9:1, wherein the mass fraction of the sodium silicate solution (water glass) is 15%, the modulus of the water glass is 3.3, and the baume degree is 38.5Be. Magnetic stirring is carried out for 30-50min at a constant temperature of 40 ℃, and the stirring speed is 30-40rpm. And (3) uniformly dispersing the polyvinyl butyral in the sodium silicate solution to obtain the surface modifier B. And then placing the primarily modified recycled coarse aggregate soaked in the surface modifier A into the surface modifier B, standing for 1d, filtering, and naturally drying to obtain the final modified recycled aggregate.
B: adding nano silicon dioxide, a water reducing agent, a defoaming agent and a water-retaining agent into water, premixing and stirring, heating to 60 ℃ at the rotating speed of 30rpm, stirring for 30min, then adding cement, regenerated micro powder, mineral powder and fly ash into a nano silicon dioxide solution, stirring to form a prepolymer, adding sea sand, slag ash and anti-crack reinforcing fibers, stirring, finally adding modified regenerated coarse aggregate and broken stone, mixing and stirring to form concrete slurry.
C: and pouring the stirred concrete slurry, vibrating by using a vibrating rod, and then laminating and curing to obtain the modified recycled fair-faced concrete.
Example 2
A: raw materials are weighed according to the mixture ratio of 188 parts of water, 320 parts of cement, 50 parts of regenerated micro powder, 40 parts of fly ash, 60 parts of mineral powder, 385 parts of sea sand, 370 parts of slag ash, 465 parts of crushed stone, 485 parts of regenerated coarse aggregate, 1.5 parts of anti-cracking reinforced fiber, 4.6 parts of water reducing agent and 2 parts of water-retaining agent.
B: adding a water reducing agent and a water-retaining agent into water, premixing and stirring, heating to 60 ℃ at the rotating speed of 30rpm, stirring for 30min, then adding cement, regenerated micro powder, mineral powder and fly ash into the stirred aqueous solution, stirring to form prepolymer, adding sea sand and slag ash, stirring, finally adding regenerated coarse aggregate and broken stone, mixing and stirring to form concrete slurry.
C: and pouring the stirred concrete slurry, vibrating by using a vibrating rod, and then laminating and curing to obtain the modified recycled fair-faced concrete.
Example 3
A: the raw materials are weighed according to the mixture ratio of 192 parts of water, 330 parts of cement, 60 parts of regenerated micro powder, 40 parts of fly ash, 50 parts of mineral powder, 380 parts of sea sand, 375 parts of slag ash, 470 parts of broken stone, 480 parts of regenerated coarse aggregate, 1.5 parts of anti-cracking reinforced fiber, 4.6 parts of water reducing agent and 2 parts of water-retaining agent. Weighing the following components in a mass ratio of 10:3:3:1, preparing a surface modifier A from the clear soybean powder solution, urea, calcium chloride and polyvinylpyrrolidone, preparing a soybean powder solution from the clear soybean powder water according to 100g/L, putting the soybean powder solution into an airflow stirring tank, introducing compressed nitrogen into the airflow stirring tank, and performing airflow stirring for 3-5min, wherein the air flow of the air is 0.1-0.2m 3 /(min·m 2 ) Then, the mixture was centrifuged at 4000rpm for 30min in a centrifuge, left to stand for 1d, and then filtered with a 0.45 μm filter to obtain a clear solution of soybean powder. Adding urea, calcium chloride powder and polyvinylpyrrolidone into the clear liquid of bean flour, and stirring at 30rpmAfter 30 minutes, the surface modifier A was obtained. And (3) soaking the recycled coarse aggregate in the surface modifier A for 1d to obtain the modified recycled coarse aggregate.
B: adding a water reducing agent and a water retention agent into water, premixing and stirring, heating to 60 ℃ at the rotating speed of 30rpm, stirring for 30min, then adding cement, regenerated micro powder, mineral powder and fly ash into an aqueous solution, stirring into a prepolymer, adding sea sand and slag ash, stirring, finally adding modified regenerated coarse aggregate and broken stone, mixing and stirring into concrete slurry.
C: and pouring the stirred concrete slurry, vibrating by using a vibrating rod, and then laminating and curing to obtain the modified recycled fair-faced concrete.
Example 4
A: raw materials are weighed according to the mixture ratio of 188 parts of water, 320 parts of cement, 60 parts of regenerated micro powder, 50 parts of fly ash, 40 parts of mineral powder, 375 parts of sea sand, 380 parts of slag ash, 475 parts of broken stone, 475 parts of regenerated coarse aggregate, 1.5 parts of anti-cracking reinforced fiber, 4.6 parts of water reducing agent and 2 parts of water-retaining agent. Weighing the following components in a mass ratio of 9:1 and polyvinyl butyral, and magnetically stirring for 30-50min at the constant temperature of 40 ℃, wherein the stirring speed is 30-40rpm. And (3) uniformly dispersing the polyvinyl butyral in a sodium silicate solution to obtain the surface modifier B. And then soaking the recycled coarse aggregate in the surface modifier B, standing for 1d, filtering, and naturally drying to obtain the final modified recycled aggregate.
B: adding a water reducing agent and a water retention agent into water, premixing and stirring, heating to 60 ℃ at the rotating speed of 30rpm, stirring for 30min, then adding cement, regenerated micro powder, mineral powder and fly ash into an aqueous solution, stirring into a prepolymer, adding sea sand and slag ash, stirring, finally adding modified regenerated coarse aggregate and broken stone, mixing and stirring into concrete slurry.
C: and pouring the stirred concrete slurry, vibrating by using a vibrating rod, and then laminating and curing to obtain the modified recycled fair-faced concrete.
Example 5
A: 192 parts of water, 330 parts of cement, 40 parts of regenerated micro powder, 60 parts of fly ash, 50 parts of mineral powder, 370 parts of sea sand, 385 parts of slag ash, 480 parts of broken stone and regenerated coarse bone470 parts of raw materials, 6.9 parts of nano silicon dioxide, 1.5 parts of anti-crack reinforcing fibers, 4.6 parts of water reducing agent, 2 parts of defoaming agent and 2 parts of water-retaining agent. Weighing the following components in a mass ratio of 10:3:3:1, urea, calcium chloride and polyvinylpyrrolidone. Preparing bean flour solution with 100g/L clear water, placing the bean flour solution into an air flow stirring tank, introducing compressed nitrogen gas, and stirring for 3-5min with air flow of 0.1-0.2m 3 /(min·m 2 ) Then, the mixture was centrifuged at 4000rpm for 30min in a centrifuge, left to stand for 1d, and then filtered with a 0.45 μm filter to obtain a clear solution of soybean powder. And (3) adding urea, calcium chloride powder and polyvinylpyrrolidone into the clear solution of the soybean flour, and stirring for 30 minutes at the rotating speed of 30rpm to obtain the surface modifier A. And (3) soaking the recycled coarse aggregate in the surface modifier A for 1d, and then taking out the recycled coarse aggregate. Weighing the following components in a mass ratio of 9:1, magnetically stirring the sodium silicate solution and the polyvinyl butyral at the constant temperature of 40 ℃ for 30-50min, wherein the stirring speed is 30-40rpm. And (3) uniformly dispersing the polyvinyl butyral in a sodium silicate solution to obtain the surface modifier B. And then placing the primarily modified recycled coarse aggregate soaked in the surface modifier A into the surface modifier B, standing for 1d, filtering, and naturally drying to obtain the final modified recycled aggregate.
B: adding nano silicon dioxide, a water reducing agent and a water-retaining agent into water, premixing and stirring, heating to 60 ℃ at the rotating speed of 30rpm, stirring for 30min, then adding cement, regenerated micro powder, mineral powder and fly ash into a nano silicon dioxide solution, stirring to form a prepolymer, adding sea sand and slag ash, stirring, finally adding modified regenerated coarse aggregate and broken stone, mixing and stirring to form concrete slurry.
C: and pouring the stirred concrete slurry, vibrating by using a vibrating rod, and then laminating and curing to obtain the modified regenerated fair-faced concrete.
Example 6
A: 188 parts of water, 320 parts of cement, 50 parts of regenerated micro powder, 60 parts of fly ash, 40 parts of mineral powder, 365 parts of sea sand, 390 parts of slag ash, 485 parts of broken stone, 465 parts of regenerated coarse aggregate, 1.5 parts of anti-crack reinforcing fiber and 6.9 parts of nano silicon dioxideThe raw materials are weighed according to the mixture ratio of 4.6 parts of water reducing agent, 2 parts of defoaming agent and 2 parts of water-retaining agent. Weighing the following components in a mass ratio of 10:3:3:1, urea, calcium chloride and polyvinylpyrrolidone. Preparing bean powder solution with 100g/L clear water, placing the bean powder solution into a gas flow stirring tank, introducing compressed nitrogen gas, and stirring for 3-5min with gas flow of 0.1-0.2m 3 /(min·m 2 ) Then, the mixture was centrifuged at 4000rpm for 30min in a centrifuge, left to stand for 1d, and then filtered with a 0.45 μm filter to obtain a clear solution of soybean powder. And (3) adding urea, calcium chloride powder and polyvinylpyrrolidone into the clear solution of the soybean flour, and stirring for 30 minutes at the rotating speed of 30rpm to obtain the surface modifier A. And (3) soaking the recycled coarse aggregate in the surface modifier A for 1d, and then taking out the recycled coarse aggregate. Weighing the following components in a mass ratio of 9:1, magnetically stirring the sodium silicate solution and the polyvinyl butyral at the constant temperature of 40 ℃ for 30-50min, wherein the stirring speed is 30-40rpm. And (3) uniformly dispersing the polyvinyl butyral in a sodium silicate solution to obtain the surface modifier B. And then placing the primarily modified recycled coarse aggregate soaked in the surface modifier A into the surface modifier B, standing for 1d, filtering, and naturally drying to obtain the final modified recycled aggregate.
B: adding nano silicon dioxide, a water reducing agent and a water-retaining agent into water, premixing and stirring, heating to 60 ℃ at the rotating speed of 30rpm, stirring for 30min, then adding cement, regenerated micro powder, mineral powder and fly ash into a nano silicon dioxide solution, stirring into a prepolymer, adding sea sand, slag ash and anti-crack reinforcing fibers, stirring, finally adding modified regenerated coarse aggregate and broken stone, mixing and stirring into concrete slurry.
C: and pouring the stirred concrete slurry, vibrating by using a vibrating rod, and then laminating and curing to obtain the modified recycled fair-faced concrete.
The examples are combined as follows in table 1:
TABLE 1 compounding ratio of each example
The concrete obtained in each example was compared, for example, with the following table 2:
TABLE 2 comparison of the compounding ratio data of the examples
From the above table, it can be seen that: the regenerated coarse aggregate is modified by the surface modifier A and the surface modifier B, so that the compressive strength and the splitting tensile strength of the concrete are greatly improved, the water absorption of the regenerated coarse aggregate modified by the surface modifier B is reduced, the workability of the concrete is ensured, and the surface bubbles are reduced. The addition of the nano silicon dioxide and the anti-cracking reinforcing fiber further promotes the hydration process, improves the compactness of the matrix, shows that the strength is further improved, reduces the number of surface cracks, and ensures that no bubbles exist on the surface of the concrete after the defoaming agent is added.
The fair-faced concrete disclosed by the invention uses modified and regenerated wastes, is added with the anti-cracking reinforced composite fibers, has good strength and apparent quality, is uniform in surface color, can achieve a decorative effect without subsequent surface processing, has the advantage of environmental protection, and effectively reduces carbon emission and construction cost.
Claims (10)
1. The modified regenerated clear water concrete is characterized in that: the feed comprises the following raw materials in parts by weight: 180-200 parts of water, 320-360 parts of cement, 40-60 parts of regenerated micro powder, 40-60 parts of fly ash, 40-60 parts of mineral powder, 365-390 parts of slag ash, 365-390 parts of sea sand, 460-490 parts of broken stone, 460-490 parts of modified regenerated coarse aggregate, 1-2 parts of anti-cracking reinforced composite fiber, 6.9 parts of nano silicon dioxide, 4.6 parts of water reducing agent, 2 parts of defoaming agent and 2 parts of water-retaining agent; the modified recycled coarse aggregate is obtained by treating recycled coarse aggregate with a surface modifier A and a surface modifier B;
the surface modifier A is a mixed solution consisting of soybean powder clear liquid, urea, calcium chloride and polyvinylpyrrolidone according to a mass ratio of 10; the surface modifier B is prepared from a sodium silicate solution and polyvinyl butyral according to a mass ratio of 9:1 are mixed.
2. The modified recycled fair-faced concrete of claim 1, wherein: the cement strength grade is not lower than 42.5 grade portland cement, the fly ash is F class I grade fly ash, the mineral powder is S105 grade mineral powder, the regenerated micro powder is particles with the particle size of less than 0.075mm collected under negative pressure after C30 common concrete test blocks are crushed, the average particle size of the nano-silica is 28-250 nm, and the purity is more than or equal to 99.8%.
3. The modified recycled fair-faced concrete of claim 1, wherein: the fineness modulus of the sea sand is 3.0-2.3, and the mud content is less than or equal to 0.4%; the slag ash is bottom ash obtained after refuse incineration, the fineness modulus is 3.0-2.3, and the content of Cl element is less than or equal to 10%; the sea sand and the slag ash jointly form fine aggregate, and the sand rate of the fine aggregate is 43.9-44.3%.
4. The modified recycled fair-faced concrete of claim 1, wherein: the nominal grain size of the crushed stone is 5.0-37.5 mm, the recycled coarse aggregate is selected according to 5.0-31.5 mm continuous gradation after being crushed by a C40 common concrete sample, and the mud content of the crushed stone and the recycled coarse aggregate is less than or equal to 0.4 percent.
5. The modified recycled fair-faced concrete of claim 1, wherein: in the surface modifier A, the clear solution of the soybean flour is prepared into a soybean flour solution of 100g/L by crushing fresh soybeans purchased from the market into powder by a crusher and then sieving the powder by a 0.25mm square-hole sieve, then the soybean flour solution is put into an airflow stirring tank, compressed nitrogen is introduced into the airflow stirring tank for airflow stirring for 3-5min, and the air flow is 0.1-0.2m 3 /(min·m 2 ) Then centrifuging at 4000rpm for 30min in a centrifuge, standing for 1d, and thenFiltering with 0.45 μm filter membrane to obtain clear solution of soybean powder; the polyvinylpyrrolidone has a water content of less than or equal to 5.0 percent, a nitrogen content of 12.0 to 12.8 percent and a density of 1.144g/cm 3 (ii) a And (3) adding urea, calcium chloride powder and polyvinylpyrrolidone into the clear solution of the soybean flour, and stirring for 30 minutes at the rotating speed of 30rpm to obtain the surface modifier A.
6. The modified recycled fair-faced concrete of claim 1, wherein: the polyvinyl butyral has a density of 1.08g/cm 3 (ii) a Weighing sodium silicate solution and polyvinyl butyral according to the components, and magnetically stirring for 30-50min at a constant temperature of 40 ℃ at a stirring speed of 30-40rpm to uniformly disperse the polyvinyl butyral in the sodium silicate solution to obtain the surface modifier B.
7. The modified recycled fair-faced concrete of claim 1, wherein: and sequentially putting the regenerated coarse aggregate into the surface modifier A and the surface modifier B, respectively soaking for 1d, and naturally drying to obtain the modified regenerated coarse aggregate.
8. The modified recycled fair-faced concrete of claim 1, wherein: the anti-cracking reinforced fiber is prepared from basalt fiber and waste woven bag broken fiber according to a mass ratio of 1:1, preparing a composition; wherein the length of the basalt fiber is 9-12 mm, the diameter is 13-15 μm, the tensile strength is 4150-4750 MPa, the elastic modulus is 95-120 GPa, and the elongation is 3.1%; the broken fiber raw material of the waste woven bag is taken from woven bags containing cement and fly ash building materials, waste woven bag fibers with the length of 12-18mm and the diameter of 15-18 mu m are obtained, the waste woven bag fibers are soaked in an acetone solution for 4-6h, then are washed for 2-4 times by using distilled water, are dried in an oven at the temperature of 50-60 ℃ to constant weight, and then are subjected to surface oxidation modification treatment by using a chemical oxidant formed by combining potassium dichromate, sulfuric acid and distilled water: at the temperature of 80 ℃, mixing potassium dichromate, sulfuric acid and water according to the mass ratio of 6:90:7 preparing a chromic acid solution, adding the woven bag fibers into the chromic acid solution, wherein the mass of the waste woven bag fibers accounts for 30-40% of that of the chromic acid solution, and the soaking time is 10-15min; and then washing the reacted waste woven bag fibers for 4-6 times by using an acetone solution, and drying in an oven at 50-60 ℃ to constant weight.
9. The modified recycled fair-faced concrete of claim 1, wherein: the water-retaining agent is hydroxypropyl methyl cellulose, is white powder and has high quality grade; the water reducing agent is a polycarboxylic acid water reducing agent, and the solid content of the liquid is 50%; the defoaming agent is organic silicon modified polyether and is in a liquid state, and the water content is less than or equal to 1 percent.
10. A method for preparing the modified recycled fair-faced concrete of claims 1 to 9, which is characterized by comprising the following steps:
1) Weighing the following components in a mass ratio of 10:3:3:1, preparing a surface modifier A from the soybean powder clear liquid, urea, calcium chloride and polyvinylpyrrolidone, and weighing the components in a mass ratio of 9:1 and polyvinyl butyral to prepare a surface modifier B;
2) Sequentially adding the regenerated coarse aggregate into the surface modifier A and the surface modifier B for soaking treatment to obtain modified regenerated coarse aggregate for later use;
3) Adding nano silicon dioxide into water according to the weight part requirement, stirring and mixing, adding cement, regenerated micro powder, mineral powder and fly ash, and stirring to obtain a prepolymer; and sequentially adding the sea sand, the slag ash, the anti-cracking reinforcing fiber, the modified recycled coarse aggregate and the broken stone, and continuously mixing and stirring to obtain the recycled fair-faced concrete.
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