CN115385625A - Low-cost environment-friendly concrete and production process thereof - Google Patents
Low-cost environment-friendly concrete and production process thereof Download PDFInfo
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- CN115385625A CN115385625A CN202210988114.6A CN202210988114A CN115385625A CN 115385625 A CN115385625 A CN 115385625A CN 202210988114 A CN202210988114 A CN 202210988114A CN 115385625 A CN115385625 A CN 115385625A
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- 239000004567 concrete Substances 0.000 title claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 title abstract description 31
- 239000002699 waste material Substances 0.000 claims abstract description 79
- 238000010276 construction Methods 0.000 claims abstract description 73
- 239000011347 resin Substances 0.000 claims abstract description 48
- 229920005989 resin Polymers 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000003607 modifier Substances 0.000 claims abstract description 35
- AUHZEENZYGFFBQ-UHFFFAOYSA-N 1,3,5-trimethylbenzene Chemical compound CC1=CC(C)=CC(C)=C1 AUHZEENZYGFFBQ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 239000010881 fly ash Substances 0.000 claims abstract description 18
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 15
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000004576 sand Substances 0.000 claims abstract description 12
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 11
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 11
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 11
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound 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 abstract description 11
- 229940089951 perfluorooctyl triethoxysilane Drugs 0.000 claims abstract description 11
- 239000010451 perlite Substances 0.000 claims abstract description 11
- 235000019362 perlite Nutrition 0.000 claims abstract description 11
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 claims abstract description 11
- AVYKQOAMZCAHRG-UHFFFAOYSA-N triethoxy(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)silane Chemical compound CCO[Si](OCC)(OCC)CCC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F AVYKQOAMZCAHRG-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 18
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 16
- 239000012615 aggregate Substances 0.000 claims description 13
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 10
- 150000001412 amines Chemical class 0.000 claims description 10
- 229920000570 polyether Polymers 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 8
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 6
- 230000004048 modification Effects 0.000 claims description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 5
- 239000004925 Acrylic resin Substances 0.000 claims description 5
- 229920000178 Acrylic resin Polymers 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229920001568 phenolic resin Polymers 0.000 claims description 5
- 239000005011 phenolic resin Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 3
- FDPIMTJIUBPUKL-UHFFFAOYSA-N dimethylacetone Natural products CCC(=O)CC FDPIMTJIUBPUKL-UHFFFAOYSA-N 0.000 claims description 2
- BTVWZWFKMIUSGS-UHFFFAOYSA-N dimethylethyleneglycol Natural products CC(C)(O)CO BTVWZWFKMIUSGS-UHFFFAOYSA-N 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- -1 ceramsite Substances 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 18
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000003756 stirring Methods 0.000 description 7
- 239000012295 chemical reaction liquid Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 3
- 239000004115 Sodium Silicate Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 125000001827 mesitylenyl group Chemical group [H]C1=C(C(*)=C(C([H])=C1C([H])([H])[H])C([H])([H])[H])C([H])([H])[H] 0.000 description 3
- 238000002715 modification method Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- 229910052911 sodium silicate Inorganic materials 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical group O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229910000280 sodium bentonite Inorganic materials 0.000 description 2
- 229940080314 sodium bentonite Drugs 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 229910000281 calcium bentonite Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007323 disproportionation reaction Methods 0.000 description 1
- 125000003827 glycol group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 125000001174 sulfone group Chemical group 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1037—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of low-cost concrete, and particularly discloses low-cost environment-friendly concrete and a production process thereof. The low-cost environment-friendly concrete is mainly prepared from the following raw materials in parts by weight: cement, modified construction waste recycled aggregate, coarse aggregate, sand, a water reducing agent, fly ash, ceramsite, hydroxypropyl methyl cellulose, perfluorooctyl triethoxysilane, montmorillonite, expanded perlite, a dispersing agent and water; the modified construction waste recycled aggregate is prepared by adopting a method comprising the following steps: 1) Crushing and screening the construction waste to prepare recycled aggregate; 2) Uniformly mixing the resin, the modifier, the capacity promoter and the solvent to prepare a modified solution, and then uniformly mixing the modified solution and the recycled aggregate to obtain the composite material; the modifier is at least one of 1,3, 5-trimethylbenzene and sulfolane. The low-cost environment-friendly concrete has the advantage of good mechanical property.
Description
Technical Field
The application relates to the technical field of concrete, in particular to low-cost environment-friendly concrete and a production process thereof.
Background
In recent years, with the continuous development of the building industry, waste buildings are continuously dismantled, a large amount of building waste is generated, the building waste brings great pressure to the ecological environment, and a lot of manpower and material resources are needed for harmless treatment, so that a large amount of resource waste is caused. At present, the technical personnel researches that the waste construction waste (waste concrete blocks, waste masonry and the like) is used as a resource, and the construction waste recycled aggregate is obtained through processing treatment such as cracking, crushing, cleaning, screening and the like, so that the problems of difficult treatment and ecological environment deterioration of a large amount of construction waste can be relieved.
The construction waste recycled aggregate is mainly composed of natural aggregates which are independently agglomerated or have old cement mortar adhered to the surfaces, the surfaces of the natural aggregates are rough and uneven, edges and corners are more, so that the construction waste recycled aggregate and the natural aggregates have great performance difference, the defects of low reaction activity, poor interface bonding and high water absorption rate exist in the using process, particularly, the overall mechanical property of concrete is greatly reduced due to poor interface bonding, and therefore, the technical problem to be solved by technical personnel is to modify the construction waste recycled aggregate to meet the construction requirement.
Disclosure of Invention
In order to improve the problem of poor interface bonding of construction waste recycled aggregate and improve the mechanical property of concrete, the application provides a low-cost environment-friendly concrete and a production process thereof.
In a first aspect, the present application provides a low-cost environment-friendly concrete, which adopts the following technical scheme:
the low-cost environment-friendly concrete is mainly prepared from the following raw materials in parts by weight:
cement: 150-180 parts;
modified construction waste recycled aggregate: 800-950 parts;
coarse aggregate: 200-300 parts;
sand: 120-180 parts;
water reducing agent: 7-12 parts;
fly ash: 15-30 parts;
ceramsite: 20-35 parts;
hydroxypropyl methylcellulose: 1-3 parts;
perfluorooctyltriethoxysilane: 0.8-1.5 parts;
montmorillonite: 2-5 parts;
expanded perlite: 5-10 parts;
dispersing agent: 5-8 parts;
water: 120-160 parts;
the modified construction waste recycled aggregate is prepared by adopting a method comprising the following steps:
1) Crushing and screening the construction waste to prepare recycled aggregate;
2) Uniformly mixing resin, a modifier, a capacity promoter and a solvent according to the mass ratio of (10-15) to (7-12) to (5-6.5) to (35-50) to prepare a modified solution, and then uniformly mixing the modified solution and recycled aggregate to obtain the composite material;
the resin is one or more of phenolic resin, epoxy resin and acrylic resin; the modifier is at least one of 1,3, 5-trimethylbenzene and sulfolane.
Through adopting above-mentioned technical scheme, add the modified construction waste recycled aggregate that more accounts for the ratio in the batching of concrete, make full use of construction waste can practice thrift manufacturing cost to a great extent, and more green accords with the sustainable development theory. In the preparation process of the modified construction waste recycled aggregate, the resin, the modifier, the volume promoter and the solvent are uniformly mixed to prepare the modified liquid, then the modified liquid is uniformly sprayed on the surface of the recycled aggregate, and the modified liquid can be filled and diffused into the defects of microcracks, pores and the like on the surface of the recycled aggregate, so that the aggregate structure is more compact. In addition, 1,3, 5-trimethylbenzene and sulfolane in the modifier can perform alkyl reaction and disproportionation reaction with resin to form a cross-linked structure with the resin, so that the content of polar groups on the surface of the recycled aggregate is greatly improved, and the interface bonding force between the modified construction waste recycled aggregate and other components is enhanced. In addition, polar groups in the resin cross-linked structure on the surface of the recycled aggregate can also participate in the hydration reaction of cement, active substances in the gel material are promoted to form a composite gel material on the surface of the recycled aggregate, the bonding strength between the recycled aggregate and between the recycled aggregate and the gel component is further improved, and the structural strength of the concrete is integrally improved.
Preferably, the modifier consists of 1,3, 5-trimethylbenzene and sulfolane according to a molar ratio (0.55-0.82): 1.
By adopting the technical scheme, the proportion of 1,3, 5-trimethylbenzene and sulfolane in the modifier is optimized and adjusted, the hydration reaction with the gel material is promoted, the activity and the reaction easiness of the corresponding ring-opening reaction, alkyl reaction and crosslinking reaction are enhanced, the interface bonding state between the recycled aggregates is improved, and the comprehensive mechanical property of the concrete is improved.
Preferably, the resin is subjected to polyether amine graft modification treatment.
By adopting the technical scheme, the resin modified by the polyether amine has higher reactivity, can increase the content of polar groups in a cross-linked structure, reduces the rigidity of molecular chains in the cross-linked structure, has better extensibility and flexibility, can disperse internal stress formed at the interface of the recycled aggregate, is not easy to generate shrinkage cracks at the interface in the subsequent curing process of concrete, and is beneficial to reducing the cracking condition.
Preferably, the molar ratio of the resin to the polyether amine is (3.5-5): 1.
By adopting the technical scheme, the molar ratio of the resin to the polyether amine is tested and adjusted, so that the flexibility of a cross-linked structure is ensured, and the stress concentration is reduced. And the condition that the interface mechanical property is reduced due to overlarge flexibility of a cross-linking structure can be avoided, so that the comprehensive mechanical property of the concrete is better.
Preferably, the compatibilizer is one of dimethyl sulfoxide, acetone and ethylene glycol.
By adopting the technical scheme, the dimethyl sulfoxide, the acetone and the ethylene glycol have stronger polarity, the penetration, the expansion and the extension of the resin molecular chain and the molecular chains of all components of the modifier can be promoted, and the formed cross-linked structure is more stable and has good isotropy.
Preferably, the mass ratio of the modified construction waste recycled aggregate to the cement is (2.7-2.875): 1.
By adopting the technical scheme, the mass ratio of the modified construction waste recycled aggregate to the cement is optimized and adjusted, the production cost is reduced within a proper range without excessively reducing the mechanical property of the concrete, and the production cost and the service performance of the concrete are further balanced.
Preferably, the raw material also comprises 3-5.5 parts by weight of furfural.
By adopting the technical scheme, the furfural is added into the raw materials, and then the raw materials have an infiltration effect among the recycled aggregate, the resin and the modifier, so that the reaction activation energy and the reaction energy barrier in the forming process of a cross-linked structure can be further reduced, the cross-linking condensation reaction of polar groups such as active groups on benzene rings, sulfone groups and hydroxyl groups on the resin in the modifier is promoted, the probability of local violent reaction between the modifier and the resin is reduced, the reaction between the modifier and the resin is more uniform, and the interface bonding force among the recycled aggregates is further improved.
In a second aspect, the present application provides a production process of a low-cost environment-friendly concrete, which adopts the following technical scheme: a production process of low-cost environment-friendly concrete comprises the following steps:
s1: uniformly mixing cement, modified construction waste recycled aggregate, coarse aggregate, sand, fly ash and ceramsite according to the formula ratio to prepare a mixture;
s2: uniformly mixing the intermediate material, a water reducing agent, hydroxypropyl methyl cellulose, perfluorooctyl triethoxysilane, montmorillonite, expanded perlite, a dispersing agent and water to obtain the water-based paint.
By adopting the technical scheme, large-particle materials such as cement, modified construction waste recycled aggregate, coarse aggregate, sand, fly ash and ceramsite with the formula amount are fully mixed, and then the rest functional materials are added to be continuously mixed to prepare uniform concrete, so that the modified construction waste recycled aggregate in the concrete is dispersed more uniformly, and the mutual combination state is better.
Preferably, the step S2 further comprises a step of adding furfural.
In a third aspect, the application provides a modification liquid, which is prepared by uniformly mixing resin, a modifier, a compatibilizer and a solvent according to a mass ratio of (10-15) to (7-12) to (5-6.5) to (35-50).
In summary, the present application has the following beneficial effects:
1. because the modified construction waste recycled aggregate which accounts for a large amount is added into the concrete, and the recycled aggregate is filled and coated by the modifier and the resin, the interface bonding property of the recycled aggregate is greatly enhanced, and the overall mechanical property of the concrete is improved. The low-cost environment-friendly concrete can be used for the aspects of road paving base materials, underground building construction landfill operation, prefabricated building components, movable plate houses, protective fences, building non-bearing walls and the like, can greatly save construction cost, and is suitable for large-scale popularization and application.
2. The resin is preferably modified by adopting the polyether amine, so that the flexibility of a cross-linking structure is improved, and the interface state between the recycled aggregates is further improved.
3. The low-cost environment-friendly concrete prepared by the production process has the advantages that a large amount of building wastes are used as raw materials, the production cost is low, the production efficiency is high, the mechanical property is good, the application field is wide, the comprehensive economic benefit is high, the price is low, and the market competitiveness is high.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials of the examples and comparative examples of the present application were all generally commercially available unless otherwise specified.
Examples
Example 1
The low-cost environment-friendly concrete is prepared from the following raw materials in parts by weight: 280kg of cement, 800kg of modified construction waste recycled aggregate, 200kg of coarse aggregate, 120kg of sand, 7kg of water reducing agent, 15kg of fly ash, 20kg of ceramsite, 1kg of hydroxypropyl methyl cellulose, 0.8kg of perfluoro octyl triethoxysilane, 2kg of montmorillonite, 5kg of expanded perlite, 5kg of dispersing agent and 120kg of water.
Wherein the cement is ordinary portland cement, and the reference number is 32.5. The coarse aggregate is 15-20cm continuous gradation. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The fly ash is first-grade fly ash. The average grain diameter of the ceramsite is 12mm. The montmorillonite is calcium bentonite. The dispersant is polyvinyl alcohol 2488.
The modified construction waste recycled aggregate of the embodiment is prepared by adopting a method comprising the following steps:
1) Classifying the construction waste, removing impurities such as wood, plastics, ironwork and the like to prepare construction waste rough materials, then crushing and screening the construction waste rough materials to prepare aggregate mixtures with the gradation of 10-25mm, and then cleaning the aggregate mixtures with clear water and then soaking the cleaned aggregate mixtures in sodium silicate solution with the mass fraction of 1.5% to prepare recycled aggregates;
2) Uniformly mixing resin, a modifier, a volume promoter and a solvent according to a mass ratio of 10.
Wherein the resin is phenolic resin, CAS:9003-35-4. The volume promoter is glycol. The solvent is water. The modifier is 1,3, 5-trimethylbenzene.
The production process of the low-cost environment-friendly concrete comprises the following steps:
s1: uniformly mixing cement, modified construction waste recycled aggregate, coarse aggregate, sand, fly ash and ceramsite according to the formula ratio in a stirrer at the stirring speed of 200rpm to prepare a mixture;
s2: uniformly mixing the intermediate material, the water reducing agent, hydroxypropyl methyl cellulose, perfluorooctyl triethoxysilane, montmorillonite, expanded perlite, a dispersing agent and water to obtain the water reducing agent.
Example 2
The low-cost environment-friendly concrete is prepared from the following raw materials in parts by weight: 350kg of cement, 950kg of modified construction waste recycled aggregate, 300kg of coarse aggregate, 180kg of sand, 12kg of water reducing agent, 30kg of fly ash, 35kg of ceramsite, 3kg of hydroxypropyl methyl cellulose, 1.5kg of perfluoro octyl triethoxysilane, 5kg of montmorillonite, 10kg of expanded perlite, 8kg of dispersing agent and 160kg of water.
Wherein the cement is ordinary portland cement, and the reference number is 32.5. The coarse aggregate is 15-20cm continuous gradation. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The fly ash is first-grade fly ash. The average grain diameter of the ceramsite is 12mm. The montmorillonite is sodium bentonite. The dispersant is dispersant ECO-2100.
The modified construction waste recycled aggregate is prepared by the method comprising the following steps:
1) Classifying the construction waste, removing impurities such as wood, plastics, ironworks and the like to prepare construction waste rough materials, then crushing and screening the construction waste rough materials to prepare an aggregate mixture with the gradation of 10-25mm, and then cleaning the aggregate mixture with clear water and then soaking the cleaned aggregate mixture in a sodium silicate solution with the mass fraction of 3% to prepare regenerated aggregate;
2) Uniformly mixing resin, a modifier, a volume promoter and a solvent according to a mass ratio of 10.
Wherein the resin is phenolic resin 2402. The volume promoter is acetone. The solvent is water. The modifier is 1,3, 5-trimethylbenzene.
The production process of the low-cost environment-friendly concrete comprises the following steps:
s1: uniformly mixing cement, modified construction waste recycled aggregate, coarse aggregate, sand, fly ash and ceramsite according to the formula ratio in a stirrer at the stirring speed of 300rpm to prepare a mixture;
s2: uniformly mixing the intermediate material, the water reducing agent, hydroxypropyl methyl cellulose, perfluorooctyl triethoxysilane, montmorillonite, expanded perlite, a dispersing agent and water to obtain the water reducing agent.
Example 3
The low-cost environment-friendly concrete is prepared from the following raw materials in parts by weight: 320kg of cement, 920kg of modified construction waste recycled aggregate, 280kg of coarse aggregate, 165kg of sand, 10kg of water reducing agent, 22kg of fly ash, 30kg of ceramsite, 2.6kg of hydroxypropyl methyl cellulose, 1.2kg of perfluoro octyl triethoxysilane, 3.5kg of montmorillonite, 8kg of expanded perlite, 7kg of dispersing agent and 150kg of water.
Wherein the cement is ordinary portland cement, and the reference number is 32.5. The coarse aggregate is 15-20cm continuous gradation. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The fly ash is first-grade fly ash. The average grain diameter of the ceramsite is 12mm. The montmorillonite is sodium bentonite. The dispersant is polyethylene oxide (PEO).
The modified construction waste recycled aggregate is prepared by the method comprising the following steps:
1) Classifying the construction waste, removing impurities such as wood, plastics, ironwork and the like to prepare construction waste rough materials, then crushing and screening the construction waste rough materials to prepare aggregate mixtures with the gradation of 10-25mm, and then cleaning the aggregate mixtures with clear water and then soaking the cleaned aggregate mixtures in a sodium silicate solution with the mass fraction of 2.5% to prepare recycled aggregates;
2) Uniformly mixing resin, a modifier, a volume promoter and a solvent according to a mass ratio of 10.
Wherein the resin is phenolic resin 2130. The volume promoter is dimethyl sulfoxide. The solvent is water. The modifier is 1,3, 5-trimethylbenzene.
The production process of the low-cost environment-friendly concrete comprises the following steps:
s1: uniformly mixing cement, modified construction waste recycled aggregate, coarse aggregate, sand, fly ash and ceramsite according to the formula ratio in a stirrer at a stirring speed of 180rpm to prepare a mixture;
s2: uniformly mixing the intermediate material, a water reducing agent, hydroxypropyl methyl cellulose, perfluorooctyl triethoxysilane, montmorillonite, expanded perlite, a dispersing agent and water to obtain the water-based paint.
Example 4
The low-cost environment-friendly concrete of the embodiment is different from the concrete of the embodiment 3 in that: the resin is acrylic resin with the model of RS-5203, and the manufacturer is Qingdao Sancheng Mitsu New Material Co., ltd, the rest is the same as in example 3.
The preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 3.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 3.
Example 5
The low-cost environment-friendly concrete of the embodiment is different from that of the embodiment 3 in that: the resin consists of epoxy resin and acrylic resin according to the mass ratio of 3:1.2, wherein the epoxy resin is epoxy resin 6101, the acrylic resin is S-120, a supplier is New materials of Alrs, guangzhou, and the rest is the same as in example 3.
The preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 3.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 3.
Example 6
The low-cost environment-friendly concrete of the embodiment is different from that of the embodiment 5 in that: in the preparation method of the modified construction waste recycled aggregate, the mass ratio of the resin to the modifier to the compatibilizer to the solvent is 15.5.
The preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 5.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 5.
Example 7
The low-cost environment-friendly concrete of the embodiment is different from the concrete of the embodiment 6 in that: in the preparation method of the modified construction waste recycled aggregate, the modifier is sulfolane.
The preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 6.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 6.
Example 8
The low-cost environment-friendly concrete of the embodiment is different from the concrete of the embodiment 6 in that: in the preparation method of the modified construction waste recycled aggregate, the modifier consists of 1,3, 5-trimethylbenzene and sulfolane according to the mol ratio of 2.
The preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 6.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 6.
Example 9
The low-cost environment-friendly concrete of the embodiment is different from the concrete of the embodiment 6 in that: in the preparation method of the modified construction waste recycled aggregate, the modifier consists of 1,3, 5-trimethylbenzene and sulfolane according to the molar ratio of 0.55.
The preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 6.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 6.
Example 10
The low-cost environment-friendly concrete of the embodiment is different from the concrete of the embodiment 6 in that: in the preparation method of the modified construction waste recycled aggregate, the modifier consists of 1,3, 5-trimethylbenzene and sulfolane according to the molar ratio of 0.82.
The preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 6.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 6.
Example 11
The low-cost environment-friendly concrete of the embodiment is different from that of the embodiment 9 in that: in the preparation method of the modified construction waste recycled aggregate, the resin is subjected to polyether amine grafting modification treatment.
The resin modification method of the embodiment comprises the following steps:
I. adding resin and polyetheramine into dimethylformamide according to the mol ratio of 2;
II. Adding 15 mol percent of hexamethylene diisocyanate of polyetheramine into the intermediate reaction liquid, and reacting for 20min under continuous stirring to obtain the product;
the preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 9.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 9.
Example 12
The low-cost environment-friendly concrete of the embodiment is different from that of the embodiment 9 in that: in the preparation method of the modified construction waste recycled aggregate, the resin is subjected to polyether amine grafting modification treatment.
The resin modification method of the embodiment comprises the following steps:
I. adding resin and polyetheramine into dimethylformamide according to the mol ratio of 3.5, adding ammonium persulfate with the molar weight of the polyetheramine of 1.5%, and stirring and reacting at the temperature of 65 ℃ to prepare intermediate reaction liquid;
II. Adding 15 mol percent of hexamethylene diisocyanate of polyetheramine into the intermediate reaction liquid, and reacting for 20min under continuous stirring to obtain the product;
the preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 9.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 9.
Example 13
The low-cost environment-friendly concrete of the embodiment is different from that of the embodiment 9 in that: in the preparation method of the modified construction waste recycled aggregate, the resin is subjected to polyether amine grafting modification treatment.
The resin modification method of the embodiment comprises the following steps:
I. adding resin and polyetheramine into dimethylformamide according to the molar ratio of 5;
II. Adding 25 mol percent of hexamethylene diisocyanate of polyetheramine into the intermediate reaction liquid, and reacting for 30min under continuous stirring to obtain the product;
the preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 9.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 9.
Example 14
The low-cost environment-friendly concrete of the embodiment is different from that of the embodiment 13 in that: the raw material also comprises 3kg of furfural.
The method of modifying the resin of this example was the same as in example 13.
The preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 13.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 13.
Example 15
The low-cost environment-friendly concrete of the embodiment is different from that of the embodiment 13 in that: the raw material also comprises 5.5kg of furfural.
The method of modifying the resin of this example was the same as in example 13.
The preparation method of the modified construction waste recycled aggregate of the embodiment is the same as that of the embodiment 13.
The production process of the low-cost environment-friendly concrete of the embodiment is the same as that of the embodiment 13.
Comparative example
Comparative example 1
The low-cost environment-friendly concrete of the comparative example is different from that of example 1 in that: in the preparation method of the modified construction waste recycled aggregate, in the step 2), the resin, the compatibilizer and the solvent are uniformly mixed according to the mass ratio of 10.
The production process of the low-cost environment-friendly concrete of the comparative example is the same as that of example 1.
Comparative example 2
The low-cost environment-friendly concrete of the comparative example is different from that of example 1 in that: in the preparation method of the modified construction waste recycled aggregate, the modifier is 25wt% of PVA solution.
The production process of the low-cost environment-friendly concrete of the comparative example is the same as that of example 1.
Comparative example 3
The low-cost environment-friendly concrete of the comparative example is different from that of example 1 in that: in the preparation method of the modified construction waste recycled aggregate, the mass ratio of the resin to the modifier to the volume-increasing agent to the solvent is 35.
The preparation method of the modified construction waste recycled aggregate of the comparative example is the same as that of example 1.
The production process of the low-cost environment-friendly concrete of the comparative example is the same as that of example 1.
Performance test
Detection method
The low-cost environment-friendly concrete of the examples 1 to 15 and the comparative examples 1 to 3 is taken to prepare a standard test block according to the national standard GB/T50081-2019 Standard of mechanical Property test methods of common concrete, the compression strength and the flexural strength of the concrete are tested for 28d, and the test results are shown in the table 1.
TABLE 1 Low cost eco-friendly concrete Performance test data for examples 1-15 and comparative examples 1-3
It can be seen from the analysis of examples 1 to 3 and comparative examples 1 to 2 and the combination of table 1 that the modified recycled aggregate of construction waste prepared from resin, modifier and recycled aggregate has better mechanical properties with respect to concrete prepared from other raw materials such as cement, the 28d compressive strength can reach 43.3MPa, the 28d flexural strength can reach 6.41MPa, the 28d compressive strength is improved by 38.9% compared with the 28d compressive strength of comparative example 1 without modifier, and the 28d compressive strength of the conventional PVA modified solution is improved by 21.6% compared with comparative example 2.
By analyzing examples 4 to 5, example 6 and comparative example 3 and combining table 1, it can be seen that the composition ratio of the resin and the modifier are optimized and adjusted, the interface bonding state of the recycled aggregate is further improved, and the overall mechanical properties of the concrete are improved.
By analyzing examples 7-10 and examples 11-13 in combination with Table 1, it can be seen that by optimizing and adjusting the composition ratio of the modifier, and by using polyetheramine to perform modified grafting treatment on the resin, the compressive strength of example 9 is improved by 5.9% compared with 28d of example 6.
It can be seen from analysis of examples 14 to 15 and table 1 that, when furfural was added, the flexibility of the crosslinked structure was improved, and the internal shrinkage cracks generated by stress concentration during curing of the concrete were reduced, and it can be seen that the flexural strength of example 14 was improved by 3.08% as compared with example 13.
Claims (9)
1. The low-cost environment-friendly concrete is characterized by being mainly prepared from the following raw materials in parts by weight:
cement: 280-350 parts;
modified construction waste recycled aggregate: 800-950 parts;
coarse aggregate: 200-300 parts;
sand: 120-180 parts;
water reducing agent: 7-12 parts;
fly ash: 15-30 parts;
ceramsite: 20-35 parts;
hydroxypropyl methylcellulose: 1-3 parts;
perfluorooctyltriethoxysilane: 0.8-1.5 parts;
montmorillonite: 2-5 parts;
expanded perlite: 5-10 parts;
dispersing agent: 5-8 parts;
water: 120-160 parts;
the modified construction waste recycled aggregate is prepared by adopting a method comprising the following steps:
1) Crushing and screening the construction waste to prepare recycled aggregate;
2) Uniformly mixing resin, a modifier, a capacity promoter and a solvent according to the mass ratio of (10-15) to (7-12) to (5-6.5) to (35-50) to prepare a modified solution, and then uniformly mixing the modified solution and recycled aggregate to obtain the composite material;
the resin is one or more of phenolic resin, epoxy resin and acrylic resin; the modifier is at least one of 1,3, 5-trimethylbenzene and sulfolane.
2. The low-cost environment-friendly concrete as claimed in claim 1, wherein the modifier consists of 1,3, 5-trimethylbenzene and sulfolane in a molar ratio (0.55-0.82): 1.
3. The low-cost environment-friendly concrete according to claim 1, wherein the resin is subjected to polyether amine grafting modification treatment.
4. The low-cost environment-friendly concrete according to claim 3, wherein the molar ratio of the resin to the polyether amine is (3.5-5): 1.
5. The concrete in accordance with claim 1, wherein the compatibilizer is one of dimethyl sulfoxide, acetone, and ethylene glycol.
6. The low-cost environment-friendly concrete as claimed in claim 1, wherein the mass ratio of the modified construction waste recycled aggregate to the cement is (2.7-2.875): 1.
7. The low-cost environment-friendly concrete according to claim 1, characterized in that the raw materials further comprise 3-5.5 parts by weight of furfural.
8. A process for producing a low-cost eco-friendly concrete according to any one of claims 1 to 6, comprising the steps of:
s1: uniformly mixing cement, modified construction waste recycled aggregate, coarse aggregate, sand, fly ash and ceramsite according to the formula ratio to prepare a mixture;
s2: uniformly mixing the intermediate material, a water reducing agent, hydroxypropyl methyl cellulose, perfluorooctyl triethoxysilane, montmorillonite, expanded perlite, a dispersing agent and water to obtain the water-based paint.
9. The process for producing low-cost and environment-friendly concrete according to claim 8, wherein the step S2 further comprises a step of adding furfural.
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