CN117602878A - Full solid waste zero-carbon concrete and preparation method thereof - Google Patents
Full solid waste zero-carbon concrete and preparation method thereof Download PDFInfo
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- CN117602878A CN117602878A CN202311335909.8A CN202311335909A CN117602878A CN 117602878 A CN117602878 A CN 117602878A CN 202311335909 A CN202311335909 A CN 202311335909A CN 117602878 A CN117602878 A CN 117602878A
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- 239000002910 solid waste Substances 0.000 title claims abstract description 224
- 239000004567 concrete Substances 0.000 title claims abstract description 112
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 82
- 238000002360 preparation method Methods 0.000 title description 21
- 239000000463 material Substances 0.000 claims abstract description 132
- 239000012615 aggregate Substances 0.000 claims abstract description 76
- 238000002156 mixing Methods 0.000 claims abstract description 32
- 239000002699 waste material Substances 0.000 claims abstract description 22
- 229910000323 aluminium silicate Inorganic materials 0.000 claims abstract description 15
- 239000002131 composite material Substances 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000012216 screening Methods 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims description 29
- 239000010881 fly ash Substances 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 22
- 239000011812 mixed powder Substances 0.000 claims description 14
- 239000002956 ash Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 239000003245 coal Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 239000011572 manganese Substances 0.000 claims description 8
- 239000010902 straw Substances 0.000 claims description 8
- 238000004131 Bayer process Methods 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 7
- 229910052602 gypsum Inorganic materials 0.000 claims description 7
- 239000010440 gypsum Substances 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 239000010802 sludge Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000012634 fragment Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 239000002023 wood Substances 0.000 claims description 5
- 241000609240 Ambelania acida Species 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 241000209140 Triticum Species 0.000 claims description 4
- 235000021307 Triticum Nutrition 0.000 claims description 4
- 239000010905 bagasse Substances 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000004056 waste incineration Methods 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 3
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 239000010813 municipal solid waste Substances 0.000 abstract description 27
- 239000004568 cement Substances 0.000 abstract description 9
- 230000005284 excitation Effects 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 239000000126 substance Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000003513 alkali Substances 0.000 description 8
- 238000006703 hydration reaction Methods 0.000 description 8
- 238000002203 pretreatment Methods 0.000 description 8
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000404 calcium aluminium silicate Substances 0.000 description 5
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 5
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 description 5
- 229940078583 calcium aluminosilicate Drugs 0.000 description 5
- 239000000378 calcium silicate Substances 0.000 description 5
- 229910052918 calcium silicate Inorganic materials 0.000 description 5
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000010878 waste rock Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229920000876 geopolymer Polymers 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
-
- 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)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of concrete materials, and relates to full solid waste zero-carbon concrete, which comprises a cementing material, aggregate and water according to 15-25: mixing at the mass ratio of 60-80:10-15 at normal temperature and normal pressure; the cementing material is an overbased solid waste material, a high sulphoaluminate solid waste material, a high aluminosilicate solid waste material, an organic solid waste material and a composite admixture according to the following proportion of 1-3: 1-3: 1-3: 1-3: mixing the materials according to a mass ratio of 1-3; the aggregate is prepared by crushing and screening the tailing solid waste materials. The invention is based on the principle of combined excitation of industrial, agricultural, urban and solid wastes, uses the wastes to treat wastes, and can realize the synergistic utilization of multiple solid wastes under the condition of normal temperature and normal pressure to prepare the concrete meeting the C40 strength. Is beneficial to reducing carbon emission in the cement concrete industry and reducing the pollution environment of industrial solid waste, agricultural solid waste and urban solid waste.
Description
Technical Field
The invention belongs to the technical field of concrete materials, and particularly relates to full solid waste zero-carbon concrete and a preparation method thereof.
Background
In order to promote the process of utilizing multiple solid wastes, the prior scholars propose the technology of utilizing the solid wastes into building materials. As patent document CN112125633a discloses a C30-grade full-solid waste concrete and a preparation method thereof, and alkaline residue-carbide residue synergistic excitation slag-fly ash composite cementing material is used for replacing cement. The novel full-solid waste concrete is prepared, the 28d strength reaches more than 30MPa, waste is changed into valuable, the environment is protected, and the production cost is reduced.
For another example, patent document CN112851156a discloses a C25-grade alkali-activated aluminosilicate full-solid waste concrete and a preparation method thereof, the concrete has a large solid waste removal amount, and the desulfurization slag, the fly ash, the blast furnace slag, the steel slag and the iron tailing slag are recycled, so that the problems of higher cost of cement-based cementing materials and high raw material price of alkali-activated agents are solved, and the cost is low. According to the improvement technology, the present invention mainly adopts industrial solid waste to prepare the composite cementing material, only the industrial solid waste is singly utilized, and the cementing material in concrete preparation is mainly low in strength, so that the application of the cementing material is greatly limited.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
The first object of the invention is to provide an all solid waste zero-carbon concrete which is prepared from industrial solid waste, agricultural solid waste andthe urban solid waste is combined to excite the cement instead of the cement, and the emission of CO can be reduced by about 0.85 ton per 1 ton of cement clinker instead of the solid waste 2 . The invention can also save the production cost of cement concrete, realize the cooperative utilization of industrial and agricultural urban solid waste at normal temperature and normal pressure, treat waste with waste, use the solid waste of tailings as aggregate, obtain the full solid waste zero-carbon concrete meeting the C40 horizontal strength.
The technical aim of the invention is realized by the following technical scheme:
the full solid waste zero carbon concrete comprises cementing materials, aggregate and water according to 15-25: mixing at normal temperature and normal pressure in a mass ratio of 60-80:10-15;
the cementing material is an overbased solid waste material, a high sulphoaluminate solid waste material, a high aluminosilicate solid waste material, an organic solid waste material and a composite admixture according to the following weight ratio of 2-3: 2-3: 2-3: 1 to 3:1 to 3 mass ratio;
the aggregate is prepared by crushing and screening the tailing solid waste materials.
In the existing solid waste concrete preparation, industrial caustic sludge is often used as an alkali excitation material, but the strength of the concrete is greatly limited, and in the prepared full solid waste zero-carbon concrete meeting the C40 horizontal strength, the high-alkalinity solid waste material, the high-sulphoaluminate solid waste material and the high-aluminosilicate solid waste material belong to industrial solid waste, the organic solid waste material belongs to agricultural solid waste, the composite admixture belongs to urban solid waste, and the composite admixture is mixed to prepare a cementing material, so that the combined excitation of the industrial solid waste, the agricultural solid waste and the urban solid waste is realized, and on the basis, the aggregate is prepared by using the tailing solid waste material, and is used as coarse, medium and fine aggregate of the concrete according to the established continuous grain composition and the mixing ratio, so that the compressive supporting capacity of the concrete can be enhanced. And the concrete is prepared by cooperating with industrial and agricultural urban solid wastes, so that the full solid waste concrete meeting the C40 horizontal strength can be obtained. The invention not only saves cement production cost, normal temperature and normal pressure, has simple process, but also is beneficial to reducing the pollution of 23 industrial and agricultural urban solid wastes to the environment.
Specifically, the mass ratio of the industrial solid waste to the agricultural solid waste to the urban solid waste is 5-7:1-3:2-3. The invention adopts the high-alkalinity solid waste material, the high-sulphoaluminate solid waste material and the high-aluminosilicate solid waste material with high alkalinity, high sulfate content and high aluminosilicate content to cooperatively generate the hydrated calcium silicate, the hydrated calcium aluminosilicate and the ettringite which are required for improving the performance of the concrete. In addition, organic solid waste materials are used for matching, the organic solid waste materials are highly cross-linked organic polymers, lignin is a key component of the vascularized plant supporting tissue, wood hardness is endowed, and the organic solid waste materials can be used as high-hardness composite aggregate to fill pores, so that the strength of the cementing material in concrete after hardening is further improved. On the basis, urban solid wastes such as urban garbage incineration fly ash, sludge, furnace ash and ash soil are utilized as composite admixture of concrete, and hydrated calcium silicate, hydrated calcium aluminosilicate and the like with improved performance are generated under the excitation of high-alkalinity solid waste alkali, and the inert property of the composite admixture can also be used as micro aggregate of the concrete to fill pores, so that the curing effect of the cementing material is improved.
Further, the cementing material is particles with specific surface area more than or equal to 600m 2 /kg of mixed powder. The larger the surface area is, the more the contact area of the raw materials is in the hydration reaction process, which is more beneficial to promoting the progress of the hydration reaction, improving the accumulation of hydration products and further improving the strength of concrete.
Preferably, the high alkaline solid waste material is converter steel slag, bayer process red mud, carbide slag, magnesium slag and limestone powder according to the proportion of 0.1-1: 0.1 to 1:0.1 to 1:0.1 to 1:0.1 to 1. Wherein the content of the Bayer process red mud is not less than 30%, the content of the carbide slag is not less than 20%, the content of the magnesium slag is not less than 20%, and the balance is the converter slag and limestone powder mixed in any proportion, which is helpful for promoting the alkali-activated hydration reaction.
The main chemical components and the content of the converter steel slag are as follows: 40 to 45 percent of CaO and Fe 2 O 3 20～25％、MgO 9～13％、SiO 2 10～15％、Al 2 O 3 1～5％。
The bayer process red mud comprises the following main chemical components in percentage by weight: fe (Fe) 2 O 3 23～30％、CaO 18～23％、Al 2 O 3 18～24％、Na 2 O7～16％、SiO 2 5-10%. The pretreatment step of Bayer process red mud is that baking is carried out by adopting a baking oven, and dispersion is carried out by adopting a ball mill, so that the specific surface area of the material is more than or equal to 600m 2 /kg。
The carbide slag comprises the following main chemical components in percentage by weight: 90-95% of CaO and SiO 2 1～4％、Al 2 O 3 1～2％。
The magnesium slag comprises the following main chemical components in percentage by weight: caO 45-50%, siO 2 32～36％、MgO 10～14％、Fe 2 O 3 3～6％。
The limestone powder comprises the following main chemical components in percentage by weight: caO 50-56%, siO 2 1～3％、Al 2 O 3 1～2％。
Further, the high-sulfur aluminate solid waste material is one or more of desulfurized gypsum, electrolytic manganese slag and phosphogypsum.
Preferably, the mass ratio of the desulfurized gypsum, the electrolytic manganese slag and the phosphogypsum is 0.1-40: 0.1 to 40:0.1 to 20 percent, and the sum of the mass of the desulfurized gypsum and the mass of the electrolytic manganese slag is 80 to 90 percent. Helping sulfate to excite hydration reaction.
The main chemical components and the content of the desulfurized gypsum are as follows: SO (SO) 3 50～53％、CaO 35～45％、SiO 2 1～5％。
The electrolytic manganese slag comprises the following main chemical components in percentage by weight: SO (SO) 3 34～40％、SiO 2 30～33％、CaO 11～14％、Fe 2 O 3 8～10％、MgO 2～4％、Al 2 O 3 1～3％。
The phosphogypsum comprises the following main chemical components in percentage by weight: SO (SO) 3 45～55％、CaO 40～43％、SiO 2 3～6％、Al 2 O 3 1～2％。
Further, the high aluminosilicate solid waste material is one or a mixture of pulverized coal furnace fly ash and circulating fluidized bed fly ash. The mass ratio of the pulverized coal furnace fly ash to the circulating fluidized bed fly ash is 6:4, and the hydration reaction is facilitated.
The main components of the circulating fluidized bed fly ash are metakaolin and amorphous phase active aluminosilicate, the main components of the pulverized coal furnace fly ash are mullite, and the reactivity of the mullite is lower than that of the metakaolin and the active aluminosilicate. However, the physical properties of the particle surfaces of the circulating fluidized bed fly ash are poor (the particles are coarse, uneven and porous), and the invention uses the pulverized coal furnace fly ash and the circulating fluidized bed fly ash to be compounded to be used as high aluminosilicate solid waste materials, so that the controllable active silica-alumina components are ensured. Specifically, the pulverized coal furnace fly ash comprises the following main chemical components in percentage by weight: siO (SiO) 2 50～55％、Al 2 O 3 23～27％、Fe 2 O 3 8-10%, caO 2-5% and MgO 1-3%. The circulating fluidized bed fly ash comprises the following main chemical components in percentage by weight: siO (SiO) 2 24～27％、Al 2 O 3 17～20％、CaO 15～19％、SO 3 10～14％、Fe 2 O 3 4～6％、MgO 2～4％。
Further, the organic solid waste material is one or more of waste bamboo, wood dust, rice straw, wheat straw and bagasse.
Preferably, the mass ratio of the waste bamboo, the wood chips, the rice straws, the wheat straws and the bagasse is 0.1-1: 0.1 to 1:0.1 to 1:0.1 to 1:0.1 to 1.
Further, the composite admixture is one or more of municipal waste incineration fly ash, sludge, furnace ash and ash soil.
Preferably, the mass ratio of the municipal waste incineration fly ash, the sludge, the furnace ash and the ash soil is 0.1-1: 0.1 to 1:0.1 to 1:0.1 to 1. The ratio of the furnace ash to the waste incineration fly ash is more than 70%, so that the alkali excitation can be promoted, higher-performance hydrated calcium silicate and hydrated calcium aluminosilicate can be generated, the particle size of the calcium silicate and hydrated calcium aluminosilicate is small, the calcium silicate and hydrated calcium aluminosilicate can be used as micro aggregate filling pores of concrete, and the curing effect of the cementing material is improved.
Further, the solid waste material of the tailings is one or more of gangue, waste stone, waste sand and tailings.
Preferably, the mass ratio of the gangue to the waste stone to the waste sand to the tailings is 0.1-1: 0.1 to 1:0.1 to 1:0.1 to 1.
Preferably, the tailing solid waste material comprises the following components in percentage by mass: 30-35% of fine-fraction tailing solid waste, 30-35% of medium-fraction tailing solid waste and 35-40% of coarse-fraction tailing solid waste; the particle size of the fine-fraction tailing solid waste is 1-5 mm; the particle size of the solid waste of the medium-sized tailings is 6-10 mm; the particle size of the coarse-grain tailing solid waste is 11-25 mm.
The second purpose of the invention is to provide a preparation method of the all-solid waste zero-carbon concrete, which has the same technical effects.
The technical aim of the invention is realized by the following technical scheme:
the preparation method of the full solid waste zero-carbon concrete comprises the following operation steps:
s1: pretreatment of the cementing material:
(1) Drying the components;
(2) Crushing the dried high-alkalinity solid waste material, high-sulphoaluminate solid waste material and high-aluminosilicate solid waste material into fragments with average particle size less than or equal to 3mm by a crusher, and fully grinding the fragments by using a test mill until the specific surface area is more than or equal to 600m 2 /kg of mixed powder.
(3) Cutting organic solid waste materials into powder with average particle diameter less than or equal to 1mm in a cutting machine, finely crushing by using a superfine crusher, and finally grinding to obtain organic solid waste mixed powder with specific particle surface area more than or equal to 600m 2 /kg。
(4) Uniformly mixing and grinding the dried composite admixture by using a ball mill to obtain mixed powder, wherein the specific surface area of particles is more than or equal to 600m 2 /kg。
(5) Mixing the mixed powder for standby;
s2: pretreatment of aggregate:
(1) Placing the solid tailings and the waste into an oven for full drying, crushing by a crusher, and screening to prepare continuous graded aggregate of 1-5 mm, 6-10 mm and 11-25 mm respectively;
s3: adding water into the cementing material and the aggregate prepared in the steps S1 and S2, and uniformly mixing and stirring according to the proportion of claim 1 to prepare the all-solid waste zero-carbon concrete;
s4: pouring the full solid waste zero-carbon concrete prepared in the step S3;
s5: curing the full solid waste zero-carbon concrete poured in the step S4, wherein the curing temperature is 0-50 ℃, and the curing humidity is 50-100% of the relative humidity or the coating curing is carried out.
In summary, the invention has the following beneficial effects:
(1) The invention utilizes the synergistic combined excitation effect of industrial solid waste (converter slag, bayer process red mud, carbide slag, magnesium slag, limestone powder, desulfurized gypsum, electrolytic manganese slag, phosphogypsum, pulverized coal furnace fly ash and circulating fluidized bed fly ash), agricultural solid waste (waste bamboo, wood dust, straw, wheat straw and bagasse) and urban solid waste (municipal refuse incineration fly ash, sludge, furnace ash and ash) to obtain the full solid waste zero-carbon concrete with C40 horizontal strength. The high-alkalinity solid waste material is not used, but the high-alkalinity solid waste material and the high-aluminosilicate solid waste material are complementarily and synergistically excited to form the cementing material with certain strength, so that the full utilization of the solid waste material is realized, and the production cost of the geopolymer cementing material can be effectively reduced. Compared with the current method for preparing concrete by using all solid wastes, the method provided by the invention has extremely low cost, can utilize agricultural solid wastes and urban solid wastes except industrial solid wastes at normal temperature and normal pressure, has a simple preparation process, has the characteristics of treating wastes by wastes and complementing the advantages of multiple solid wastes, ensures that the all solid wastes and zero-carbon concrete meets the C40 horizontal strength, and simultaneously greatly reduces the pollution of industrial and agricultural urban solid wastes to the environment.
(2) The invention utilizes the fully solid waste material to prepare the concrete, does not use cement components, can alleviate the problems of high energy consumption and high pollution generated by silicate cement production to a certain extent, lightens the pressure of excessive stone exploitation and insufficient natural aggregate, reduces the production cost of the concrete, and meets the requirements of energy conservation, emission reduction and green sustainable development.
Detailed Description
In order to further explain the technical means and effects adopted by the invention to achieve the preset aim, the invention provides the all-solid waste zero-carbon concrete and the preparation method thereof, and the specific implementation mode, the characteristics and the effects thereof are described in detail below.
The sources of the raw materials used in the examples:
the industrial solid waste and the tailing solid waste in the embodiment of the invention come from corresponding factories, the agricultural solid waste mainly comes from agricultural wastes, and the urban solid waste mainly comes from household garbage.
| Species of type | Commercial sources |
| Converter steel slag | Guizhou Steel Combined group steelworks |
| Bayer process red mud | Guizhou Kaili alumina works |
| Carbide slag | Six-disc mercury photo-acetylene gas plant |
| Magnesium slag | Guizhou Zhenning Huanglong metal magnesium plant |
| Limestone powder | Guizhou Zhengxing calcium Co Ltd |
| Desulfurized gypsum | Guizhou Zong Yi environmental protection technology Co., ltd |
| Electrolytic manganese slag | Qian Yu electrolytic manganese plant in Kaili city |
| Phosphogypsum | Jieli phosphogypsum commercial Co.Ltd |
| Pulverized coal furnace fly ash | Funeng (Guizhou) Power Generation Co.,Ltd. |
| Circulating fluidized bed fly ash | Funeng (Guizhou) Power Generation Co.,Ltd. |
| Gangue | Guizhou Chijin gangue comprehensive utilization Co., ltd |
| Waste stone | Guizhou Deqifeisha waste rock treatment Co.Ltd |
| Waste sand | Waste rock and waste sand treatment Limited company for impression of Jiangnan |
| Tailings | Limited liability company of Shengyuan mining in Guizhi county |
Example 1
The preparation method of the full solid waste zero-carbon concrete comprises the following operation steps:
s1: pretreatment of the cementing material:
(1) Drying the components;
(2) Crushing the dried high-alkalinity solid waste material, high-sulphoaluminate solid waste material and high-aluminosilicate solid waste material into fragments with average particle size less than or equal to 3mm through a crusher, and then usingThe test mill is fully ground until the specific surface area is more than or equal to 600m 2 /kg of mixed powder.
(3) Cutting organic solid waste materials into powder with average particle diameter less than or equal to 1mm in a cutting machine, finely crushing by using a superfine crusher, and finally grinding to obtain organic solid waste mixed powder with specific particle surface area more than or equal to 600m 2 /kg。
(4) Uniformly mixing and grinding the dried composite admixture by using a ball mill to obtain mixed powder, wherein the specific surface area of particles is more than or equal to 600m 2 /kg。
(5) Mixing the mixed powder according to industrial solid waste: agricultural solid waste: mixing urban solid waste at a mass ratio of 6:3:1 to prepare a cementing material;
s2: pretreatment of aggregate:
(1) Placing the solid tailings and the waste into an oven for full drying, crushing by a crusher, and screening to prepare continuous graded aggregate of 1-5 mm, 6-10 mm and 11-25 mm respectively;
s3: adding water into the cementing material and the aggregate prepared in the steps S1 and S2, wherein the cementing material, the fine aggregate, the medium aggregate and the coarse aggregate are prepared according to the following weight ratio of 1:1.2:1.2:1.2, uniformly mixing and stirring to prepare the full solid waste zero carbon concrete;
s4: pouring the full solid waste zero-carbon concrete prepared in the step S3;
s5: and (3) curing the full solid waste zero-carbon concrete poured in the step (S4), wherein the curing temperature is 25 ℃, and the curing humidity is 50% of the relative humidity.
Example 2
The preparation method of the full solid waste zero-carbon concrete comprises the following operation steps:
s1: pretreatment of cementing materials and aggregates:
the pretreatment method and the single solid waste mass ratio of the cementing material and the aggregate in the full solid waste zero-carbon concrete in the embodiment are the same as those in the embodiment 1, and the cementing material is prepared from the following industrial solid waste: agricultural solid waste: mixing urban solid waste at a mass ratio of 7:2:1;
s2: adding water into the cementing material and the aggregate prepared in the step S1, wherein the cementing material, the fine aggregate, the medium aggregate and the coarse aggregate are prepared according to the following steps of 1:1.2:1.2:1.2, uniformly mixing and stirring to prepare the full solid waste zero carbon concrete;
s3: pouring the full solid waste zero-carbon concrete prepared in the step S2;
s4: curing the full solid waste zero-carbon concrete poured in the step S3, wherein the curing temperature is 25 ℃, and the curing humidity is 60% of the relative humidity.
Example 3
The preparation method of the full solid waste zero-carbon concrete comprises the following operation steps:
s1: pretreatment of cementing materials and aggregates:
the pretreatment method and the single solid waste mass ratio of the cementing material and the aggregate in the full solid waste zero-carbon concrete in the embodiment are the same as those in the embodiment 1, and the cementing material is prepared from the following industrial solid waste: agricultural solid waste: mixing urban solid waste at a mass ratio of 6:2:2;
s2: adding water into the cementing material and the aggregate prepared in the step S1, wherein the cementing material, the fine aggregate, the medium aggregate and the coarse aggregate are prepared according to the following steps of 1:1.2:1.3:1.2, uniformly mixing and stirring to prepare the full solid waste zero carbon concrete;
s3: pouring the full solid waste zero-carbon concrete prepared in the step S2;
s4: and (3) performing film-covering curing on the full solid waste zero-carbon concrete poured in the step (S3), wherein the curing temperature is 25 ℃.
Example 4
The preparation method of the full solid waste zero-carbon concrete comprises the following operation steps:
s1: pretreatment of cementing materials and aggregates:
the pretreatment method and the single solid waste mass ratio of the cementing material and the aggregate in the full solid waste zero-carbon concrete in the embodiment are the same as those in the embodiment 1, and the cementing material is prepared from the following industrial solid waste: agricultural solid waste: mixing urban solid waste at a mass ratio of 6:1:3;
s2: adding water into the cementing material and the aggregate prepared in the step S1, wherein the cementing material, the fine aggregate, the medium aggregate and the coarse aggregate are prepared according to the following steps of 1:1.2:1.2:1.2, uniformly mixing and stirring to prepare the full solid waste zero carbon concrete;
s3: pouring the full solid waste zero-carbon concrete prepared in the step S2;
s4: curing the full solid waste zero-carbon concrete poured in the step S3, wherein the curing temperature is 25 ℃, and the curing humidity is 80% of the relative humidity.
Example 5
The preparation method of the full solid waste zero-carbon concrete comprises the following operation steps:
s1: pretreatment of cementing materials and aggregates:
the pretreatment method and the single solid waste mass ratio of the cementing material and the aggregate in the full solid waste zero-carbon concrete in the embodiment are the same as those in the embodiment 1, and the cementing material is prepared from the following industrial solid waste: agricultural solid waste: mixing urban solid waste at a mass ratio of 7:1:2;
s2: adding water into the cementing material and the aggregate prepared in the step S1, wherein the cementing material, the fine aggregate, the medium aggregate and the coarse aggregate are prepared according to the following steps of 1:1.2:1.2:1.2, uniformly mixing and stirring to prepare the full solid waste zero carbon concrete;
s3: pouring the full solid waste zero-carbon concrete prepared in the step S2;
s4: curing the full solid waste zero-carbon concrete poured in the step S3, wherein the curing temperature is 25 ℃, and the curing humidity is 80% of the relative humidity.
Example 6
The preparation method of the full solid waste zero-carbon concrete comprises the following operation steps:
s1: pretreatment of cementing materials and aggregates:
the pretreatment method and the single solid waste mass ratio of the cementing material and the aggregate in the full solid waste zero-carbon concrete in the embodiment are the same as those in the embodiment 1, and the cementing material is prepared from the following industrial solid waste: agricultural solid waste: mixing urban solid waste at a mass ratio of 5:1:4;
s2: adding water into the cementing material and the aggregate prepared in the step S1, wherein the cementing material, the fine aggregate, the medium aggregate and the coarse aggregate are prepared according to the following steps of 1:1.2:1.2:1.2, uniformly mixing and stirring to prepare the full solid waste zero carbon concrete;
s3: pouring the full solid waste zero-carbon concrete prepared in the step S2;
s4: curing the full solid waste zero-carbon concrete poured in the step S3, wherein the curing temperature is 25 ℃, and the curing humidity is 50% of the relative humidity.
Example 7
The preparation method of the full solid waste zero-carbon concrete comprises the following operation steps:
s1: pretreatment of cementing materials and aggregates:
the pretreatment method and the single solid waste mass ratio of the cementing material and the aggregate in the full solid waste zero-carbon concrete in the embodiment are the same as those in the embodiment 1, and the cementing material is prepared from the following industrial solid waste: agricultural solid waste: mixing urban solid waste at a mass ratio of 5:2:3;
s2: adding water into the cementing material and the aggregate prepared in the step S1, wherein the cementing material, the fine aggregate, the medium aggregate and the coarse aggregate are prepared according to the following steps of 1:1.2:1.2:1.2, uniformly mixing and stirring to prepare the full solid waste zero carbon concrete;
s3: pouring the full solid waste zero-carbon concrete prepared in the step S2;
s4: curing the full solid waste zero-carbon concrete poured in the step S3, wherein the curing temperature is 25 ℃, and the curing humidity is 50% of the relative humidity.
Example 8
The preparation method of the full solid waste zero-carbon concrete comprises the following operation steps:
s1: pretreatment of cementing materials and aggregates:
the pretreatment method and the single solid waste mass ratio of the cementing material and the aggregate in the full solid waste zero-carbon concrete in the embodiment are the same as those in the embodiment 1, and the cementing material is prepared from the following industrial solid waste: agricultural solid waste: mixing urban solid waste at a mass ratio of 5:3:2;
s2: adding water into the cementing material and the aggregate prepared in the step S1, wherein the cementing material, the fine aggregate, the medium aggregate and the coarse aggregate are prepared according to the following steps of 1:1.2:1.2:1.2, uniformly mixing and stirring to prepare the full solid waste zero carbon concrete;
s3: pouring the full solid waste zero-carbon concrete prepared in the step S2;
s4: curing the full solid waste zero-carbon concrete poured in the step S3, wherein the curing temperature is 25 ℃, and the curing humidity is 50% of the relative humidity.
Example 9
The preparation method of the full solid waste zero-carbon concrete comprises the following operation steps:
s1: pretreatment of cementing materials and aggregates:
the pretreatment method and the single solid waste mass ratio of the cementing material and the aggregate in the full solid waste zero-carbon concrete in the embodiment are the same as those in the embodiment 1, and the cementing material is prepared from the following industrial solid waste: agricultural solid waste: mixing urban solid waste at a mass ratio of 5:4:1;
s2: adding water into the cementing material and the aggregate prepared in the step S1, wherein the cementing material, the fine aggregate, the medium aggregate and the coarse aggregate are prepared according to the following steps of 1:1.2:1.2:1.2, uniformly mixing and stirring to prepare the full solid waste zero carbon concrete;
s3: pouring the full solid waste zero-carbon concrete prepared in the step S2;
s4: curing the full solid waste zero-carbon concrete poured in the step S3, wherein the curing temperature is 25 ℃, and the curing humidity is 50% of the relative humidity.
Comparative example 1
The preparation method of industrial solid waste in the all-solid-waste zero-carbon concrete and the single solid waste mass in the embodiment are as in step 1 in the embodiment, the all-industrial solid waste mixed material is mixed with aggregate, and hydration reaction fully occurs in a stirrer to obtain the all-solid-waste zero-carbon ready-mixed concrete.
Concrete strength performance test
The all-solid waste zero-carbon concrete obtained in examples 1 to 9 and the all-industrial solid waste concrete obtained in comparative example 1 were used as detection targets. And detecting the strength performance (MPa, compressive strength value) of the all-solid waste zero-carbon concrete according to the strength index of the C40 concrete in GB/T41054-2021. The test results are shown in the following table:
table 1 Performance comparison of all solid waste zero carbon concretes 1 to 9 with comparative example 1
| Sample of | Compression resistance/MPa for 3 days | Compression resistance/MPa for 28 days |
| National standard C40 concrete | ≥20.00 | ≥40.00 |
| Example 1 | 20.78 | 46.27 |
| Example 2 | 20.84 | 46.21 |
| Example 3 | 20.87 | 45.79 |
| Example 4 | 20.68 | 45.62 |
| Example 5 | 20.99 | 47.26 |
| Example 6 | 20.97 | 46.91 |
| Example 7 | 20.87 | 46.56 |
| Example 8 | 20.86 | 45.93 |
| Example 9 | 20.62 | 44.90 |
| Comparative example 1 | 17.03 | 42.15 |
The data of the compressive strength of the examples and comparative examples in Table 1 are compared, and the concrete prepared by using the full industrial solid waste of comparative example 1 has a compressive strength of 17.03MPa for 3 days and 42.15MPa for 28 days. The strength of the full solid waste zero-carbon concrete prepared by the cooperation of industrial solid waste, agricultural solid waste and urban solid waste is higher than that of the full industrial solid waste concrete. As can be seen from comparing 9 groups of examples, when the solid waste of industrial and agricultural cities in the all solid waste zero-carbon concrete is equal to 7:1: the mixed materials with the proportion of 2 are mixed with the aggregate, and hydration reaction is fully carried out in a stirrer to obtain the full solid waste zero-carbon concrete with the highest strength, namely the 3-day compressive strength of 20.99MPa and the 28-day compressive strength of 47.26MPa, and the strength of C40 level is satisfied. This illustrates that the synergistic effect of the industrial and agricultural urban solid wastes is best in the proportion of example 5. The method has remarkable effects due to the alkali excitation effect of industrial solid wastes, the high hardness of organic polymers of agricultural solid wastes, the alkali excitation and micro aggregate effect of urban solid wastes and the supporting effect of tailing solid wastes.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The full solid waste zero-carbon concrete is characterized by comprising a cementing material, aggregate and water according to 15-25: mixing at the mass ratio of 60-80:10-15 at normal temperature and normal pressure;
the cementing material is an overbased solid waste material, a high sulphoaluminate solid waste material, a high aluminosilicate solid waste material, an organic solid waste material and a composite admixture according to the following proportion of 1-3: 1-3: 1-3: 1-3: mixing the materials according to a mass ratio of 1-3;
the aggregate is prepared by crushing and screening the tailing solid waste materials.
2. The all-solid-waste zero-carbon concrete according to claim 1, wherein the cementing material is a material with a specific surface area of not less than 600m 2 /kg of mixed powder.
3. The all-solid-waste zero-carbon concrete according to claim 1, wherein the high-alkalinity solid waste material is one or more of converter steel slag, bayer process red mud, carbide slag, magnesium slag and limestone powder.
4. The all solid waste zero carbon concrete of claim 1, wherein the high sulfoaluminate solid waste material is one or more of desulfurized gypsum, electrolytic manganese slag and phosphogypsum.
5. The all solid waste zero carbon concrete of claim 1, wherein the high aluminosilicate solid waste material is one of pulverized coal furnace fly ash and circulating fluidized bed fly ash or a mixture thereof.
6. The all-solid-waste zero-carbon concrete according to claim 1, wherein the organic solid waste material is one or more of waste bamboo, wood chips, rice straw, wheat straw and bagasse.
7. The all-solid-waste zero-carbon concrete according to claim 1, wherein the composite admixture is one or more of municipal waste incineration fly ash, sludge, furnace ash and ash.
8. The all-solid-waste zero-carbon concrete according to claim 1, wherein the solid waste material of the tailings is one or more of coal gangue, waste stone, waste sand and tailings.
9. The all-solid-waste zero-carbon concrete according to claim 1, wherein the tailing solid-waste material comprises the following components in percentage by mass: 30-35% of fine-fraction tailing solid waste, 30-35% of medium-fraction tailing solid waste and 35-40% of coarse-fraction tailing solid waste; the particle size of the fine-fraction tailing solid waste is 1-5 mm; the particle size of the solid waste of the medium-sized tailings is 6-10 mm; the particle size of the coarse-grain-level tailing solid waste is 11-25 mm.
10. The method for preparing the all-solid-waste zero-carbon concrete according to claim 1, which is characterized by comprising the following operation steps:
s1: pretreatment of the cementing material:
(1) Crushing the high-alkalinity solid waste material, the high-sulphoaluminate solid waste material and the high-aluminosilicate solid waste material into fragments with average particle size less than or equal to 3mm by a crusher, and fully grinding the fragments by using a test mill until the specific surface area is more than or equal to 600m 2 A/kg mixed powder;
(2) Cutting organic solid waste materials into powder with average particle diameter less than or equal to 1mm in a cutting machine, finely crushing by using a superfine crusher, and finally grinding to obtain organic solid waste mixed powder with specific particle surface area more than or equal to 600m 2 /kg；
(3) Drying the composite admixture in an oven, and uniformly mixing and grinding by using a ball millObtaining mixed powder, the specific surface area of the particles is more than or equal to 600m 2 /kg；
(4) Mixing the mixed powder for standby;
s2: pretreatment of aggregate:
(1) Placing the solid tailings into an oven for fully drying, crushing by a crusher, and screening to prepare continuous graded aggregate of 1-5 mm, 6-10 mm and 11-25 mm respectively;
s3: adding water into the cementing material and the aggregate prepared in the steps S1 and S2, and uniformly mixing and stirring according to the proportion of claim 1 to prepare the all-solid waste zero-carbon concrete;
s4: pouring the full solid waste zero-carbon concrete prepared in the step S3;
s5: curing the full solid waste zero-carbon concrete poured in the step S4, wherein the curing temperature is 0-50 ℃, and the curing humidity is 50-100% of the relative humidity or the coating curing is carried out.
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