CN112759307A - Recycling method of waste concrete mixture - Google Patents
Recycling method of waste concrete mixture Download PDFInfo
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- CN112759307A CN112759307A CN202011637012.7A CN202011637012A CN112759307A CN 112759307 A CN112759307 A CN 112759307A CN 202011637012 A CN202011637012 A CN 202011637012A CN 112759307 A CN112759307 A CN 112759307A
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- 239000002699 waste material Substances 0.000 title claims abstract description 66
- 239000000203 mixture Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004064 recycling Methods 0.000 title claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 25
- 238000012216 screening Methods 0.000 claims abstract description 25
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 13
- 229920002239 polyacrylonitrile Polymers 0.000 claims abstract description 13
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000000440 bentonite Substances 0.000 claims abstract description 11
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 11
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- GYXUNDYSSCDRAG-UHFFFAOYSA-N 1,1,2,2,2-pentafluoroethyl prop-2-enoate Chemical compound FC(F)(F)C(F)(F)OC(=O)C=C GYXUNDYSSCDRAG-UHFFFAOYSA-N 0.000 claims abstract description 10
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 10
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000001694 spray drying Methods 0.000 claims abstract description 8
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000654 additive Substances 0.000 claims abstract description 4
- 230000000996 additive effect Effects 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 6
- 125000001931 aliphatic group Chemical group 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 claims description 4
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 3
- 229920000877 Melamine resin Polymers 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical class O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 claims description 3
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 claims description 3
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 3
- JUJWROOIHBZHMG-UHFFFAOYSA-O pyridinium Chemical compound C1=CC=[NH+]C=C1 JUJWROOIHBZHMG-UHFFFAOYSA-O 0.000 claims description 3
- 235000010413 sodium alginate Nutrition 0.000 claims description 3
- 239000000661 sodium alginate Substances 0.000 claims description 3
- 229940005550 sodium alginate Drugs 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 3
- 229920002554 vinyl polymer Polymers 0.000 claims description 3
- 108010010803 Gelatin Proteins 0.000 claims description 2
- 229920002873 Polyethylenimine Polymers 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 claims description 2
- 239000008273 gelatin Substances 0.000 claims description 2
- 229920000159 gelatin Polymers 0.000 claims description 2
- 235000019322 gelatine Nutrition 0.000 claims description 2
- 235000011852 gelatine desserts Nutrition 0.000 claims description 2
- 235000018102 proteins Nutrition 0.000 claims description 2
- 108090000623 proteins and genes Proteins 0.000 claims description 2
- 102000004169 proteins and genes Human genes 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 5
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 3
- 125000005004 perfluoroethyl group Chemical group FC(F)(F)C(F)(F)* 0.000 description 3
- 239000008030 superplasticizer Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/065—Polyacrylates; Polymethacrylates
- C04B16/0658—Polyacrylonitrile
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
-
- 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)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for recycling waste concrete mixtures, which comprises the following steps: dispersing perfluoroethyl acrylate in water uniformly, adding nano-silica for ultrasonic treatment for 1-2h, performing ultrasonic treatment with the ultrasonic power of 300-500W, performing spray drying, adding the mixture into an ethanol water solution, sequentially adding an emulsifier and sodium dodecyl benzene sulfonate under the stirring state, and performing ultrasonic treatment to obtain a concrete reinforcing agent; crushing the waste concrete, screening by adopting a vibrating screen with the grading of 10-20, adding a concrete reinforcing agent after screening is finished, drying, and standing for 2-4 days to obtain pretreated waste concrete; uniformly stirring natural latex, bentonite, an organic flocculant and a high-efficiency water reducing agent at normal temperature, adding polyacrylonitrile fiber, and continuously stirring to obtain a premix; under the normal temperature state, uniformly mixing the pretreated waste concrete, the premix, the steel slag and the cement, adding the sand, the additive and the water, and stirring to obtain the premixed concrete.
Description
Technical Field
The invention relates to the technical field of concrete recycling, in particular to a recycling method of waste concrete mixtures.
Background
With the economic development of China, the modernized construction of cities, towns and villages in China is increasingly accelerated, with the continuous deepening of the urbanized construction, a large number of houses in the cities and the villages are removed, the roads in the cities are continuously expanded and rebuilt, and the quantity of the generated construction wastes is rapidly increased, wherein the waste concrete accounts for a large proportion, and the traditional treatment method is landfill or stacking. However, the extensive treatment method not only occupies a large amount of land resources, but also easily generates a large amount of dust in the stacking process, is very easy to cause secondary pollution, aggravates environmental pollution and seriously affects the health of residents, so that how to better utilize the waste concrete is a problem which needs high attention.
In order to reduce the pressure, waste concrete is mostly directly used as concrete aggregate at present, so that the cost is saved, and the resource utilization is realized. However, when the waste concrete is directly used as the aggregate of the concrete, the concrete has the defects of low compressive strength and poor toughness, and the crack resistance problem is also highlighted along with the improvement of the strength grade of the cement, so that the frequent building accidents are caused.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a method for recycling waste concrete mixtures.
A recycling method of waste concrete mixture comprises the following steps:
s1, dispersing the perfluoroethyl acrylate in water uniformly, adding nano-silica for ultrasonic treatment for 1-2h with the ultrasonic power of 300-500W, spray drying, adding into an ethanol water solution, adding an emulsifier and sodium dodecyl benzene sulfonate in turn under the stirring state for ultrasonic treatment for 1-2h with the ultrasonic power of 300-500W to obtain a concrete reinforcing agent;
s2, crushing the waste concrete, screening by adopting a vibrating screen with the grading of 10-20, adding a concrete reinforcing agent after screening is finished, drying, and standing for 2-4 days to obtain pretreated waste concrete;
s3, uniformly stirring the natural latex, the bentonite, the organic flocculant and the high-efficiency water reducing agent at normal temperature, adding the polyacrylonitrile fiber, and continuously stirring to obtain a premix;
and S4, uniformly mixing the pretreated waste concrete, the premix, the steel slag and the cement at normal temperature, adding the sand, the additive and the water, and stirring to obtain the premixed concrete.
Preferably, in S1, the mass fraction of the ethanol water solution is 50-70%, and the mass ratio of the perfluoroethyl acrylate, the nano-silica, the ethanol water solution, the emulsifier and the sodium dodecyl benzene sulfonate is 1-2: 4-12: 40-70: 1-2: 1-2.
Preferably, in S2, the particles with the particle size of 10-50cm are obtained by crushing.
Preferably, in S2, the mass ratio of the waste concrete after vibrating screening to the concrete reinforcing agent is 100: 10-20.
Preferably, in S3, the mass ratio of the natural latex to the bentonite to the organic flocculant to the high-efficiency water reducing agent to the polyacrylonitrile fiber is 20-40: 1-5: 1-3: 1-2: 2-7.
Preferably, in S3, the organic flocculant is at least one of starch, protein, gelatin, sodium alginate, sodium carboxymethylcellulose, polyacrylamide, sodium polyacrylate, polyvinyl pyridinium, and polyethyleneimine.
Preferably, in S3, the high-efficiency water reducing agent is at least one of a naphthalene sulfonate formaldehyde condensate, a sulfonated melamine formaldehyde resin, an sulfamate-based high-efficiency water reducing agent, and an HSB aliphatic high-efficiency water reducing agent.
Preferably, in S4, the mass ratio of the pretreated waste concrete, the premix, the steel slag, the cement, the sand, the admixture and the water is 100: 20-40: 2-8: 15-35: 15-35: 1-3: 30-100.
The technical effects of the invention are as follows:
because the nano-silica has extremely strong surface activity but has the problem of easy agglomeration, the invention adopts the perfluoro ethyl acrylate to carry out surface modification on the nano-silica, wherein the polar end of the perfluoro ethyl acrylate is adsorbed on the surface of the nano-silica with extremely strong electronegativity, and the non-polar end is outward, thereby not only obviously improving the problem of easy agglomeration of the nano-silica, but also being added into the waste concrete after the screening is finished, the perfluoro ethyl acrylate can be uniformly adsorbed on the surface of the waste concrete, the oil-water interfacial tension of the waste concrete in a system can be effectively reduced, the fluidity in the system can be improved, simultaneously, the modification reinforcing agent strongly adsorbed on the surface of the waste concrete can be efficiently permeated into the surrounding environment, the cohesive force and the dispersion degree of the waste concrete and the surrounding system can be improved, the bonding is firm after the solidification, compared with the concrete prepared by the, the compressive strength is high, the toughness is obviously improved, the operation is simple, and the popularization is easy.
The invention wets the waste concrete, combines the concrete reinforcing agent and is matched with the action of the polyacrylonitrile fiber, thereby further promoting the polyacrylonitrile fiber to be uniformly dispersed in the cement paste and avoiding the occurrence of fiber agglomeration, thereby ensuring the toughness of the concrete, effectively enhancing the crack resistance of the product and obviously improving the mechanical property. The invention only needs to be transported to the construction site and stirred evenly on the construction site, and the operation is very convenient.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A recycling method of waste concrete mixture comprises the following steps:
s1, dispersing 1kg of perfluoroethyl acrylate in 100kg of water, uniformly stirring, adding 12kg of nano-silica, performing ultrasonic treatment for 1 hour with the ultrasonic power of 500W, performing spray drying, adding the mixture into 40kg of ethanol aqueous solution with the mass fraction of 50%, sequentially adding 2kg of emulsifier and 1kg of sodium dodecyl benzene sulfonate under the stirring state, performing ultrasonic treatment for 2 hours with the ultrasonic power of 300W, and thus obtaining the concrete reinforcing agent;
s2, adding the waste concrete into a grinder to be ground to obtain particles with the particle size of 50cm, screening by adopting a vibrating screen with the grading of 10, adding a concrete reinforcing agent after screening is finished, wherein the mass ratio of the waste concrete to the concrete reinforcing agent after screening by vibration is 100: 20, drying and standing for 2 days to obtain pretreated waste concrete;
s3, adding 40kg of natural latex, 1kg of bentonite, 3kg of sodium polyacrylate and 1kg of naphthalenesulfonate formaldehyde condensate into a stirring kettle, uniformly stirring at normal temperature, adding 7kg of polyacrylonitrile fiber, and continuously stirring for 10min at the stirring speed of 200r/min to obtain premix;
s4, under the normal temperature state, 100kg of pretreated waste concrete, 20kg of premix, 8kg of steel slag and 15kg of cement are added into a stirring container to be uniformly mixed, 35kg of sand, 1kg of admixture and 100kg of water are added to be stirred, and the stirring time is 20S, so that the premixed concrete is obtained.
Example 2
A recycling method of waste concrete mixture comprises the following steps:
s1, dispersing 2kg of perfluoroethyl acrylate in 100kg of water, uniformly stirring, adding 4kg of nano silicon dioxide, performing ultrasonic treatment for 2 hours with the ultrasonic power of 300W, performing spray drying, adding the mixture into 70kg of ethanol aqueous solution with the mass fraction of 70%, sequentially adding 1kg of emulsifier and 2kg of sodium dodecyl benzene sulfonate under the stirring state, performing ultrasonic treatment for 1 hour with the ultrasonic power of 500W, and thus obtaining the concrete reinforcing agent;
s2, adding the waste concrete into a grinder to be ground to obtain particles with the particle size of 10cm, screening by adopting a vibrating screen with the grading of 20, adding a concrete reinforcing agent after screening is finished, wherein the mass ratio of the waste concrete to the concrete reinforcing agent after screening is 100: 10, drying and standing for 4 days to obtain pretreated waste concrete;
s3, adding 20kg of natural latex, 5kg of bentonite, 1kg of sodium alginate and 2kg of sulfonated melamine formaldehyde resin into a stirring kettle, uniformly stirring at normal temperature, adding 2kg of polyacrylonitrile fiber, and continuously stirring for 20min at the stirring speed of 100r/min to obtain a premix;
s4, under the normal temperature state, 100kg of pretreated waste concrete, 40kg of premix, 2kg of steel slag and 35kg of cement are added into a stirring container to be uniformly mixed, 15kg of sand, 3kg of admixture and 30kg of water are added to be stirred, and the stirring time is 40S, so that the premixed concrete is obtained.
Example 3
A recycling method of waste concrete mixture comprises the following steps:
s1, dispersing 1.3kg of perfluoroethyl acrylate in 100kg of water, uniformly stirring, adding 10kg of nano-silica, performing ultrasonic treatment for 1.2h with the ultrasonic power of 450W, performing spray drying, adding the mixture into 50kg of ethanol aqueous solution with the mass fraction of 65%, sequentially adding 1.3kg of emulsifier and 1.8kg of sodium dodecyl benzene sulfonate under the stirring state, performing ultrasonic treatment for 1.3h with the ultrasonic power of 450W, and thus obtaining the concrete reinforcing agent;
s2, adding the waste concrete into a grinder to be ground to obtain particles with the particle size of 20cm, screening by adopting a vibrating screen with the grading of 15, adding a concrete reinforcing agent after screening is finished, wherein the mass ratio of the waste concrete to the concrete reinforcing agent after screening is 100: 17, drying and standing for 2.5 days to obtain pretreated waste concrete;
s3, adding 35kg of natural latex, 2kg of bentonite, 2.5kg of sodium carboxymethylcellulose and 1.3kg of sulfamate system superplasticizer into a stirring kettle, uniformly stirring at normal temperature, adding 6kg of polyacrylonitrile fiber, and continuously stirring for 12min at the stirring speed of 180r/min to obtain a premix;
s4, under the normal temperature state, 100kg of pretreated waste concrete, 25kg of premix, 6kg of steel slag and 20kg of cement are added into a stirring container to be uniformly mixed, 30kg of sand, 1.5kg of admixture and 80kg of water are added to be stirred, and the stirring time is 25S, so that the premixed concrete is obtained.
After pouring the premixed concrete obtained in the embodiment, obtaining a concrete block, and after curing for 3 days, the compressive strength is 22.9 MPa; the compressive strength after 7 days of curing is 35.7MPa, and the compressive strength after 28 days of curing is 48.3 MPa.
Example 4
A recycling method of waste concrete mixture comprises the following steps:
s1, dispersing 1.7kg of perfluoroethyl acrylate in 100kg of water, uniformly stirring, adding 6kg of nano-silica, performing ultrasonic treatment for 1.8h with the ultrasonic power of 350W, performing spray drying, adding the mixture into 60kg of ethanol aqueous solution with the mass fraction of 55%, sequentially adding 1.7kg of emulsifier and 1.2kg of sodium dodecyl benzene sulfonate under the stirring state, performing ultrasonic treatment for 1.7h with the ultrasonic power of 350W, and thus obtaining the concrete reinforcing agent;
s2, adding the waste concrete into a grinder to be ground to obtain particles with the particle size of 40cm, screening by adopting a vibrating screen with the grading of 15, adding a concrete reinforcing agent after screening is finished, wherein the mass ratio of the waste concrete to the concrete reinforcing agent after screening is 100: 13, drying and standing for 3.5 days to obtain pretreated waste concrete;
s3, adding 25kg of natural latex, 4kg of bentonite, 1.5kg of polyvinyl pyridinium and 1.7kg of sulfamate system high-efficiency water reducing agent into a stirring kettle, uniformly stirring at normal temperature, adding 4kg of polyacrylonitrile fiber, and continuously stirring for 18min at the stirring speed of 120r/min to obtain a premix;
s4, under the normal temperature state, 100kg of pretreated waste concrete, 35kg of premix, 4kg of steel slag and 30kg of cement are added into a stirring container to be uniformly mixed, 20kg of sand, 2.5kg of additive and 40kg of water are added to be stirred, and the stirring time is 35S, so that the premixed concrete is obtained.
After pouring the premixed concrete obtained in the embodiment, obtaining a concrete block, and after curing for 3 days, the compressive strength is 23.5 MPa; the compressive strength after 7 days of curing is 34.2MPa, and the compressive strength after 28 days of curing is 50.1 MPa.
Example 5
A recycling method of waste concrete mixture comprises the following steps:
s1, dispersing 1.5kg of perfluoroethyl acrylate in 100kg of water, uniformly stirring, adding 8kg of nano-silica, performing ultrasonic treatment for 1.5h with the ultrasonic power of 400W, performing spray drying, adding the mixture into 55kg of ethanol aqueous solution with the mass fraction of 60%, sequentially adding 1.5kg of emulsifier and 1.5kg of sodium dodecyl benzene sulfonate under the stirring state, performing ultrasonic treatment for 1.5h with the ultrasonic power of 400W, and thus obtaining the concrete reinforcing agent;
s2, adding the waste concrete into a grinder to be ground to obtain particles with the particle size of 30cm, screening by adopting a vibrating screen with the grading of 15, adding a concrete reinforcing agent after screening is finished, wherein the mass ratio of the waste concrete to the concrete reinforcing agent after screening is 100: 15, drying and standing for 3 days to obtain pretreated waste concrete;
s3, adding 30kg of natural latex, 3kg of bentonite, 2kg of polyacrylamide and 1.5kg of HSB aliphatic superplasticizer into a stirring kettle, uniformly stirring at normal temperature, adding 5kg of polyacrylonitrile fiber, and continuously stirring for 15min at the stirring speed of 150r/min to obtain a premix;
s4, under the normal temperature state, 100kg of pretreated waste concrete, 30kg of premix, 5kg of steel slag and 25kg of cement are added into a stirring container to be uniformly mixed, 25kg of sand, 2kg of admixture and 60kg of water are added to be stirred, and the stirring time is 30S, so that the premixed concrete is obtained.
After pouring the premixed concrete obtained in the embodiment, obtaining a concrete block, and after curing for 3 days, the compressive strength is 23.8 MPa; the compressive strength after 7 days of curing was 37.5MPa, and the compressive strength after 28 days of curing was 51.3 MPa.
Control group
A recycling method of waste concrete mixture comprises the following steps:
s1, adding the waste concrete into a grinder to be ground to obtain particles with the particle size of 30cm, and screening by adopting a vibrating screen with the grading of 15 to obtain pretreated waste concrete;
s2, adding 30kg of natural latex, 3kg of bentonite, 2kg of polyacrylamide and 1.5kg of HSB aliphatic superplasticizer into a stirring kettle, uniformly stirring at normal temperature, adding 5kg of polyacrylonitrile fiber, and continuously stirring for 15min at the stirring speed of 150r/min to obtain a premix;
s4, under the normal temperature state, 100kg of pretreated waste concrete, 30kg of premix, 5kg of steel slag and 25kg of cement are added into a stirring container to be uniformly mixed, 25kg of sand, 2kg of admixture and 60kg of water are added to be stirred, and the stirring time is 30S, so that the premixed concrete is obtained.
After pouring the premixed concrete obtained in the comparative example, concrete blocks are obtained, and the compressive strength is 16.9MPa after 3 days of curing; the compressive strength after 7 days of curing is 28.8MPa, and the compressive strength after 28 days of curing is 37.5 MPa.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A recycling method of waste concrete mixture is characterized by comprising the following steps:
s1, dispersing the perfluoroethyl acrylate in water uniformly, adding nano-silica for ultrasonic treatment for 1-2h with the ultrasonic power of 300-500W, spray drying, adding into an ethanol water solution, adding an emulsifier and sodium dodecyl benzene sulfonate in turn under the stirring state for ultrasonic treatment for 1-2h with the ultrasonic power of 300-500W to obtain a concrete reinforcing agent;
s2, crushing the waste concrete, screening by adopting a vibrating screen with the grading of 10-20, adding a concrete reinforcing agent after screening is finished, drying, and standing for 2-4 days to obtain pretreated waste concrete;
s3, uniformly stirring the natural latex, the bentonite, the organic flocculant and the high-efficiency water reducing agent at normal temperature, adding the polyacrylonitrile fiber, and continuously stirring to obtain a premix;
and S4, uniformly mixing the pretreated waste concrete, the premix, the steel slag and the cement at normal temperature, adding the sand, the additive and the water, and stirring to obtain the premixed concrete.
2. The recycling method of the waste concrete mixture according to claim 1, wherein in S1, the mass fraction of the ethanol aqueous solution is 50-70%, and the mass ratio of the perfluoroethyl acrylate, the nano-silica, the ethanol aqueous solution, the emulsifier and the sodium dodecyl benzene sulfonate is 1-2: 4-12: 40-70: 1-2: 1-2.
3. The recycling method of waste concrete mixtures according to claim 1, wherein in S2, the particles with a particle size of 10-50cm are obtained by crushing.
4. The recycling method of the waste concrete mixture as claimed in claim 1, wherein in S2, the mass ratio of the waste concrete after vibrating screening to the concrete reinforcing agent is 100: 10-20.
5. The recycling method of the waste concrete mixture according to claim 1, wherein in S3, the mass ratio of the natural latex to the bentonite to the organic flocculant to the high-efficiency water reducing agent to the polyacrylonitrile fiber is 20-40: 1-5: 1-3: 1-2: 2-7.
6. The method of claim 1, wherein in S3, the organic flocculant is at least one of starch, protein, gelatin, sodium alginate, sodium carboxymethylcellulose, polyacrylamide, sodium polyacrylate, polyvinyl pyridinium, and polyethyleneimine.
7. The recycling method of the waste concrete mixture according to claim 1, wherein in S3, the high-efficiency water reducing agent is at least one of a naphthalene sulfonate formaldehyde condensate, a sulfonated melamine formaldehyde resin, an sulfamate-based high-efficiency water reducing agent, and an HSB aliphatic high-efficiency water reducing agent.
8. The recycling method of the waste concrete mixture as claimed in claim 1, wherein in S4, the mass ratio of the pretreated waste concrete, the premix, the steel slag, the cement, the sand, the admixture and the water is 100: 20-40: 2-8: 15-35: 15-35: 1-3: 30-100.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100834856B1 (en) * | 2007-02-26 | 2008-06-03 | 최헌근 | Manufacturing method of composition using waste concrete and its composition |
| CN102786243A (en) * | 2012-07-27 | 2012-11-21 | 深圳大学 | Modified recycled aggregate and recycled aggregate high-performance concrete |
| CN104449631A (en) * | 2014-11-25 | 2015-03-25 | 中国石油大学(华东) | Strong gas-wetting nanosilicon dioxide water block removal agent, preparation method thereof and method for wetting transition of rock surface |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100834856B1 (en) * | 2007-02-26 | 2008-06-03 | 최헌근 | Manufacturing method of composition using waste concrete and its composition |
| CN102786243A (en) * | 2012-07-27 | 2012-11-21 | 深圳大学 | Modified recycled aggregate and recycled aggregate high-performance concrete |
| CN104449631A (en) * | 2014-11-25 | 2015-03-25 | 中国石油大学(华东) | Strong gas-wetting nanosilicon dioxide water block removal agent, preparation method thereof and method for wetting transition of rock surface |
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Application publication date: 20210507 |