CN116606091A - Full solid waste carbon-fixing prestressed green concrete hollow slab and preparation method thereof - Google Patents
Full solid waste carbon-fixing prestressed green concrete hollow slab and preparation method thereof Download PDFInfo
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- CN116606091A CN116606091A CN202310227105.XA CN202310227105A CN116606091A CN 116606091 A CN116606091 A CN 116606091A CN 202310227105 A CN202310227105 A CN 202310227105A CN 116606091 A CN116606091 A CN 116606091A
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- 239000002910 solid waste Substances 0.000 title claims abstract description 40
- 239000004567 concrete Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title description 14
- 239000002893 slag Substances 0.000 claims abstract description 79
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 70
- 229910052802 copper Inorganic materials 0.000 claims abstract description 70
- 239000010949 copper Substances 0.000 claims abstract description 70
- 238000000034 method Methods 0.000 claims abstract description 40
- 239000002245 particle Substances 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000002156 mixing Methods 0.000 claims abstract description 31
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 30
- MLIREBYILWEBDM-UHFFFAOYSA-N cyanoacetic acid Chemical compound OC(=O)CC#N MLIREBYILWEBDM-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 25
- 239000010456 wollastonite Substances 0.000 claims abstract description 25
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- 238000001238 wet grinding Methods 0.000 claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 19
- 239000011513 prestressed concrete Substances 0.000 claims abstract description 16
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 15
- 238000012216 screening Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000009837 dry grinding Methods 0.000 claims abstract description 12
- 239000011812 mixed powder Substances 0.000 claims abstract description 12
- 239000004575 stone Substances 0.000 claims abstract description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 11
- 238000007873 sieving Methods 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 18
- 230000009467 reduction Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 7
- 238000003763 carbonization Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 238000000227 grinding Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052840 fayalite Inorganic materials 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000002742 anti-folding effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/383—Whiskers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0481—Other specific industrial waste materials not provided for elsewhere in C04B18/00
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/144—Slags from the production of specific metals other than iron or of specific alloys, e.g. ferrochrome slags
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/12—Acids or salts thereof containing halogen in the anion
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/125—Compounds containing one or more carbon-to-nitrogen double or triple bonds, e.g. imines
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mining & Mineral Resources (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The application discloses a method for full solid waste carbon fixation prestressed green concrete, which comprises the following steps: 50-65 parts of copper slag, 20-30 parts of wollastonite tailing powder and 15-20 parts of carbide slag by weight are respectively subjected to dry grinding, and then mixed powder with the particle size of 20-40 mu m is obtained by screening; mixing the powder and water according to 1:2 weight ofMixing evenly and introducing CO together with 2-5 parts of polycarboxylate water reducer, 1-4 parts of magnesium chloride, 0.3-0.8 part of cyanoacetic acid and 170-230 parts of copper slag fine aggregate 2 Wet grinding under the gas condition to obtain mortar; and uniformly mixing and stirring the mortar with 255-345 parts of crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab. According to the application, copper slag, wollastonite tailings and carbide slag are used as cementing materials, and the copper slag is used as fine aggregate, so that the effect of replacing all solid wastes is realized, and the method has the effects of energy conservation, emission reduction and low carbon and environmental protection.
Description
Technical Field
The application relates to the technical field of building materials, in particular to a preparation method of full solid waste carbon fixation prestressed green concrete.
Background
Carbon dioxide is a major environmental hazard in the greenhouse effect. Carbon dioxide is the main gas causing the greenhouse effect, and the greenhouse effect causes the global temperature to rise, so that glaciers melt, sea level rises, part of coastal cities are submerged, and the damages such as land desertification, agricultural yield reduction and the like are caused. Thus, reduction of carbon emissions is urgent.
The natural type of wollastonite ore is usually two types of the penkate type ore and the wollastonite-quartz-calcite type ore, and a large amount of wollastonite tailings are present in wollastonite mining areas, so that the value of the tailings is not fully utilized. On the other hand, the tailings and the waste residues do not find a proper treatment method, can be stacked at will, occupy land, pollute water sources and environment, and are typical bulk solid wastes.
Chinese patent application publication No. CN 113443878A discloses an ultra-high performance hollow concrete slab and a method for preparing the same, which uses portland cement, silica fume, and fly ash to prepare a cementing material. The application realizes recycling of solid waste resources to a certain extent, but the silicate cement is used to increase carbon dioxide emission, so that the effect of carbon fixation is not achieved, and the application is not beneficial to popularization in future production.
Therefore, there is a need to develop a method for preparing a concrete hollow slab by efficiently utilizing waste residue resources and fixing carbon.
Disclosure of Invention
The application aims to provide a full solid waste carbon-fixing prestressed green concrete hollow slab and a preparation method thereof, wherein copper slag, wollastonite tailings and carbide slag are used as cementing materials, and the copper slag is used as fine aggregate, so that the full solid waste replacement effect is realized, and the full solid waste carbon-fixing prestressed green concrete hollow slab has the effects of energy conservation, emission reduction and low carbon and environmental protection. In order to achieve the above purpose, the present application adopts the following technical scheme:
in a first aspect of the application, a method for preparing full solid waste carbon-fixing prestressed green concrete is provided, the method comprising:
50-65 parts of copper slag, 20-30 parts of wollastonite tailing powder and 15-20 parts of carbide slag by weight are respectively subjected to dry grinding, and then are mixed after sieving to obtain powder with the particle size of 20-40 mu m;
screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
the powder and water were mixed according to 1:2 weight ratio and 2-5 parts of polycarboxylate water reducer, 1-4 parts of magnesium chloride, 0.3-0.8 part of cyanoacetic acid and 170-230 parts of copper slag fine aggregate are added with CO 2 Wet grinding under the gas condition to obtain mortar;
and uniformly mixing and stirring the mortar with 255-345 parts of crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
Further, the wet milling conditions are: introducing carbon dioxide at the air speed of 2.3-2.5 parts by mass/min at the temperature of 35-45 ℃, wherein the rotating speed of wet grinding is 350-400 r/min.
Further, the copper slag is waste slag generated in the copper smelting process; the copper slag comprises the following chemical components in percentage by mass: siO 30 is less than or equal to 2 ≤40％，5≤CaO≤10％，1≤MgO≤5％,2≤Al 2 O 3 Less than or equal to 4 percent, 27 to 35 percent of iron and 2 to 3 percent of zinc.
Further, the grain size of the mortar is 0.35-5.74 mu m.
Further, the polycarboxylate water reducer is selected from JGT 223-2017 polycarboxylate high-performance water reducers.
In a second aspect of the application, the full solid waste carbon-fixing prestressed green concrete prepared by the method is provided.
In a third aspect of the application, a full solid waste carbon-fixing prestressed green concrete hollow slab is provided, the hollow slab is of a full closed structure, the outer wall of the hollow slab is formed by the full solid waste carbon-fixing prestressed green concrete according to claim 5, and the inside of the hollow slab is a foam slab.
One or more technical solutions in the embodiments of the present application at least have the following technical effects or advantages:
1. according to the application, copper slag, wollastonite tailings and carbide slag are used as cementing materials, and the copper slag is used as fine aggregate, so that the effect of replacing all solid wastes is realized, and the method has the effects of energy conservation, emission reduction and low carbon and environmental protection.
2. In the process of co-carbonization, the surface of copper slag aggregate is carbonized to form a silicon-rich layer, and in the process of preparing the hollow slab later, the surface layer can react with carbide slag to generate calcium silicate hydrate, and the calcium silicate and a matrix can be closely combined together. Solves the problems of weak transition area between the matrix and the aggregate interface and low mechanical property in the existing system.
3. According to the application, copper slag powder and wollastonite tailing powder are subjected to wet grinding carbonization, and simultaneously under the action of cyanoacetic acid, the carbonization efficiency is greatly improved, a large amount of silicon dioxide is released, the silicon dioxide can react with carbide slag, cement is not needed, and higher strength can be realized under the condition of full solid waste. The magnesium chloride promotes the conversion of calcium carbonate into aragonite whisker, plays the purpose of increasing the anti-folding and toughening, does not need to add fiber additionally to the full solid waste carbon-fixing prestressed green concrete hollow slab, and can realize the purpose of low-cost toughening.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the preparation method of the present application.
Detailed Description
The advantages and various effects of the present application will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the application, not to limit the application.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In case of conflict, the present specification will control.
Unless specifically indicated otherwise, the various raw materials, reagents, instruments, equipment, etc., used in the present application are commercially available or may be obtained by existing methods.
Thus, according to an exemplary embodiment of the present application, there is provided a method for preparing full solid waste carbon-fixing prestressed green concrete, the method comprising:
s1, separating 50-65 parts of copper slag, 20-30 parts of wollastonite tailing powder and 15-20 parts of carbide slag by weight, dry grinding, sieving and mixing to obtain mixed powder with the particle size of 20-40 mu m;
in the step S1 of the above-mentioned process,
because the hardness of copper slag, wollastonite tailing powder and carbide slag is different, the copper slag, the wollastonite tailing powder and the carbide slag are separated and dry-ground, copper slag powder, wollastonite tailing powder and carbide slag powder with the particle size of 20-40 mu m are respectively obtained by screening, and the three powder are mixed to obtain mixed powder;
the said processThe copper slag is waste slag generated in the copper smelting process; the main chemical components of the obtained copper slag are as follows: siO 30 is less than or equal to 2 ≤40％，5≤CaO≤10％，1≤MgO≤5％,2≤Al 2 O 3 Less than or equal to 4 percent, and in addition, a large amount of iron 27-35 percent and a small amount of zinc 2-3 percent, wherein the main ore is fayalite (FeSiO containing 90 percent) 4 ) The color is black, the specific surface area is 400-500 m 2 /kg。
The wollastonite tailing powder is white and tiny dust, red, flaky, radial or fibrous aggregate. The main chemical components are as follows: 43.35 CaO is less than or equal to 48.25 percent and 51.75 SiO is less than or equal to 51.75 percent 2 ≤56.65％。
Step S2, screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
the copper slag fine aggregate with the grain diameter of 0.5-4.75 mm can play a role of grinding media in the subsequent wet grinding process.
Step S3, mixing the powder and water according to the following ratio of 1:2 weight ratio and 2-5 parts of polycarboxylate water reducer, 1-4 parts of magnesium chloride, 0.3-0.8 part of cyanoacetic acid and 170-230 parts of copper slag fine aggregate are added with CO 2 Wet grinding under the gas condition to obtain mortar;
in the step S3 of the above-mentioned process,
the wet milling conditions are as follows: introducing carbon dioxide at the gas speed of 2.3 to 2.5 parts by mass/min at the temperature of 35 to 45 ℃. If the temperature is too low, the hydration is slowed down, which is unfavorable for the formation of hydration products. If the temperature is too high, water in the mill is evaporated, so that wet milling is not facilitated, and the dissolution of ions is reduced; if the speed of introducing carbon dioxide is less than 2.3 parts by mass/min, the carbonization reaction is obviously reduced, and the generation of a silicon-rich layer is reduced. If the mass fraction is more than 2.5 parts per minute, the carbonization reaction is not remarkably increased, but the experiment cost is increased.
The rotating speed of the wet grinding is 350-400 r/min. If the rotating speed is less than 350r/min, the lifted height of the ball in the ball mill is small, the ball slides down from the top of the ball load under the action of gravity of the ball, and the ball is in a effusion state, at the moment, the impact force of the ball is small, but the grinding effect is strong, the ore is mainly ground and peeled to be crushed, and the ore grinding effect is not high; if the speed is more than 400r/min, the steel ball can rotate along with the cylinder body and can not fall down, and the centrifugal operation state is realized. At the moment, the steel ball has no impact effect, the grinding effect is very small, and the energy consumption and the yield of the mill are high.
The grain size of the mortar is 0.35-5.74 mu m.
The polycarboxylate water reducer is selected from JGT 223-2017 polycarboxylate high-performance water reducer. The polycarboxylate water reducer, magnesium chloride and cyanoacetic acid have good dispersing function in the wet grinding process, and simultaneously have double acceleration effect on carbonization.
Copper slag powder, wollastonite tailings and copper slag aggregate are carbonized in a stirring mill by a wet method, and no additional grinding medium is needed, so that the copper slag aggregate can play a role in grinding the medium.
The cyanoacetic acid has the function of making the liquid phase environment slightly acidic, which is beneficial to the dissolution of iron phase in fayalite and calcium in wollastonite. Can realize the large-scale dissolution of silicon and provide enough silicon phase for the subsequent reaction. In addition, cyano groups have a strong complexing effect on ferrous ions (iron in fayalite), and thus have a double accelerating effect on carbonization of fayalite.
And S4, uniformly mixing and stirring 255-345 parts of the mortar and crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
The steps S1 to S4 are all weight parts.
According to another exemplary implementation mode of the embodiment of the application, the full solid waste carbon-fixing prestressed green concrete obtained by adopting the method is provided.
According to another exemplary implementation manner of the embodiment of the present application, a full solid waste carbon-fixing prestressed green concrete hollow slab is provided, the hollow slab is of a full closed structure, the outer wall of the hollow slab is formed by the full solid waste carbon-fixing prestressed green concrete according to claim 5, and the inside is a foam slab.
The thickness of the outer wall is 2-3 cm, and the thickness of the foam board is 10-20 cm.
Before pouring the prestressed concrete hollow slab, grinding, polishing and hardening the ballast bed surface; traction laying of steel strands on a ballast bed; anchoring the steel strand, tensioning the steel strand, laying a protective layer under the steel strand, placing an embedded part, putting the steel strand into a buckling piece of the embedded part, and spraying water on the bed surface of the ballast bed. And pouring, vibrating, forming and curing to obtain the prestressed concrete hollow slab.
The following will describe the preparation method of the full solid waste carbon-fixing prestressed green concrete according to the present application in detail with reference to examples, comparative examples and experimental data.
Example 1, full solid waste carbon fixation prestressed green concrete hollow slab and preparation method thereof
The embodiment provides a full solid waste carbon fixation prestressed green concrete hollow slab, and the method comprises the following steps:
separately dry-grinding 65 parts of copper slag, 20 parts of wollastonite tailing powder and 15 parts of carbide slag in parts by weight, sieving and mixing to obtain mixed powder with the particle size of 20-40 mu m;
screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
mixing the powder and water according to 1:2 weight portions and 5 portions of polycarboxylate water reducer, 4 portions of magnesium chloride, 0.8 portion of cyanoacetic acid and 200 portions of copper slag fine aggregate are added with CO 2 Wet grinding under the gas condition to obtain mortar;
and uniformly mixing and stirring the mortar with 300 parts of crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
Example 2, full solid waste carbon fixation prestressed green concrete hollow slab and preparation method thereof
The embodiment provides a full solid waste carbon fixation prestressed green concrete hollow slab, and the method comprises the following steps:
respectively carrying out dry grinding on 60 parts of copper slag, 20 parts of wollastonite tailing powder and 20 parts of carbide slag by weight, and then sieving and mixing to obtain mixed powder with the particle size of 20-40 mu m;
screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
mixing the powder and water according to 1:2 weight ratio and 4 parts of polycarboxylate water reducer, 4 parts of magnesium chloride, 0.6 part of cyanoacetic acid and 200 parts of copper slag fine aggregate are added with CO 2 Wet grinding under the gas condition to obtain mortar;
and uniformly mixing and stirring the mortar with 300 parts of crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
Example 3, full solid waste carbon fixation prestressed green concrete hollow slab and preparation method thereof
The embodiment provides a full solid waste carbon fixation prestressed green concrete hollow slab, and the method comprises the following steps:
respectively carrying out dry grinding on 60 parts of copper slag, 25 parts of wollastonite tailing powder and 15 parts of carbide slag by weight, and then sieving and mixing to obtain mixed powder with the particle size of 20-40 mu m;
screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
mixing the powder and water according to 1:2 weight portions and 4 portions of polycarboxylate water reducer, 3 portions of magnesium chloride, 0.6 portion of cyanoacetic acid and 200 portions of copper slag fine aggregate are added with CO 2 Wet grinding under the gas condition to obtain mortar;
and uniformly mixing and stirring the mortar with 300 parts of crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
Example 4, full solid waste carbon fixation prestressed green concrete hollow slab and preparation method thereof
The embodiment provides a full solid waste carbon fixation prestressed green concrete hollow slab, and the method comprises the following steps:
respectively carrying out dry grinding on 55 parts of copper slag, 25 parts of wollastonite tailing powder and 20 parts of carbide slag by weight, and then sieving and mixing to obtain mixed powder with the particle size of 20-40 mu m;
screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
mixing the powder and water according to 1:2 weight portions and 3 portions of polycarboxylate water reducer, 3 portions of magnesium chloride, 0.4 portion of cyanoacetic acid and 200 portions of copper slag fine aggregate are added with CO 2 Wet grinding under the gas condition to obtain mortar;
and uniformly mixing and stirring the mortar with 300 parts of crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
Example 5, full solid waste carbon fixation prestressed green concrete hollow slab and preparation method thereof
The embodiment provides a full solid waste carbon fixation prestressed green concrete hollow slab, and the method comprises the following steps:
respectively carrying out dry grinding on 55 parts of copper slag, 30 parts of wollastonite tailing powder and 15 parts of carbide slag by weight, and then sieving and mixing to obtain mixed powder with the particle size of 20-40 mu m;
screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
mixing the powder and water according to 1:2 weight portions and 3 portions of polycarboxylate water reducer, 2 portions of magnesium chloride, 0.4 portion of cyanoacetic acid and 170 portions of copper slag fine aggregate are added with CO 2 Wet grinding under the gas condition to obtain mortar;
and (3) uniformly mixing and stirring 255 parts of crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
Example 6, full solid waste carbon fixation prestressed green concrete hollow slab and preparation method thereof
The embodiment provides a full solid waste carbon fixation prestressed green concrete hollow slab, and the method comprises the following steps:
50 parts of copper slag, 30 parts of wollastonite tailing powder and 20 parts of carbide slag are respectively subjected to dry grinding in parts by weight, and then are mixed after sieving to obtain mixed powder with the particle size of 20-40 mu m;
screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
mixing the powder and water according to 1:2 weight portions and 2 portions of polycarboxylate water reducer, 1 portion of magnesium chloride, 0.3 portion of cyanoacetic acid and 230 portions of copper slag fine aggregate are mixed together, and CO is introduced 2 Wet grinding under the gas condition to obtain mortar;
and mixing the mortar with 345 parts of crushed stone with the particle size of 6-25 mm, stirring uniformly, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
Comparative example 1
The comparative example was prepared without magnesium chloride by the following steps:
separately dry-grinding 65 parts of copper slag, 20 parts of wollastonite tailing powder and 15 parts of carbide slag in parts by weight, sieving and mixing to obtain mixed powder with the particle size of 20-40 mu m;
screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
mixing the powder and water according to 1:2 weight ratio and 5 parts of polycarboxylate water reducer, 0.8 part of cyanoacetic acid and 200 parts of copper slag fine aggregate are added with CO 2 Wet grinding under the gas condition to obtain mortar;
and uniformly mixing and stirring the mortar with 300 parts of crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
Comparative example 2
In this comparative example, no cyanoacetic acid was present, and the specific preparation method was as follows:
the embodiment provides a full solid waste carbon fixation prestressed green concrete hollow slab, and the method comprises the following steps:
separately dry-grinding 65 parts of copper slag, 20 parts of wollastonite tailing powder and 15 parts of carbide slag in parts by weight, sieving and mixing to obtain mixed powder with the particle size of 20-40 mu m;
screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
mixing the powder and water according to 1:2 weight ratio and 5 parts of polycarboxylate water reducer, 4 parts of magnesium chloride and 200 parts of copper slag fine aggregate are added with CO 2 Wet milling under gas condition to obtainMortar;
and uniformly mixing and stirring the mortar with 300 parts of crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
Experimental example 1
For ease of comparison, the list of parameters for the preparation of examples 1-6 and comparative examples 1-2 is as follows:
TABLE 1
After each group is cured and molded, slump, compressive strength and carbon fixation rate of slurry are tested according to GB/T14040-2007 Standard Specification of prestressed concrete, and specific results are shown in the following Table 2.
TABLE 2
As can be seen from table 2:
compared with comparative examples 1-2, the prestressed concrete hollow slab prepared in examples 1-2 has the characteristics of better compressive strength, slump and slurry carbon fixation rate. Meanwhile, as magnesium chloride promotes the conversion of calcium carbonate into aragonite whisker, the purpose of increasing the folding resistance and the toughness is achieved, and no additional fiber is needed. Can be applied to the production of building floor boards, wall boards, sound insulation boards and cover boards.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A method for fully-solid waste carbon-fixing prestressed green concrete, which is characterized by comprising the following steps:
50-65 parts of copper slag, 20-30 parts of wollastonite tailing powder and 15-20 parts of carbide slag by weight are respectively subjected to dry grinding, and then are mixed after sieving to obtain mixed powder with the particle size of 20-40 mu m;
screening untreated copper to obtain copper slag fine aggregate with the particle size of 0.5-4.75 mm;
mixing the powder and water according to 1:2 weight ratio and 2-5 parts of polycarboxylate water reducer, 1-4 parts of magnesium chloride, 0.3-0.8 part of cyanoacetic acid and 170-230 parts of copper slag fine aggregate are added with CO 2 Wet grinding under the gas condition to obtain mortar;
and uniformly mixing and stirring the mortar with 255-345 parts of crushed stone with the particle size of 6-25 mm, and vibrating, forming and curing to obtain the prestressed concrete hollow slab.
2. The method of claim 1, wherein the wet milling conditions are: introducing carbon dioxide at the air speed of 2.3-2.5 parts by mass/min at the temperature of 35-45 ℃, wherein the rotating speed of wet grinding is 350-400 r/min.
3. According to claim 1The method is characterized in that the copper slag is waste slag generated in the copper smelting process; the copper slag comprises the following chemical components in percentage by mass: siO 30 is less than or equal to 2 ≤40％，5≤CaO≤10％，1≤MgO≤5％,2≤Al 2 O 3 Less than or equal to 4 percent, 27 to 35 percent of iron and 2 to 3 percent of zinc.
4. The method according to claim 1, wherein the mortar has a particle size of 0.35 to 5.74 μm.
5. The method according to claim 1, wherein the polycarboxylate water reducer is selected from JGT 223-2017 polycarboxylate-based high performance water reducers.
6. A fully solid waste carbon-fixing prestressed green concrete prepared by the method of any one of claims 1-5.
7. The full solid waste carbon-fixing prestressed green concrete hollow slab is characterized in that the hollow slab is of a full-closed structure, the outer wall of the hollow slab is formed by the full solid waste carbon-fixing prestressed green concrete according to claim 5, and the inside of the hollow slab is a foam slab.
8. The full solid waste carbon fixation prestressed green concrete hollow slab of claim 7, wherein the thickness of the outer wall is 2-3 cm, and the thickness of the foam slab is 10-20 cm.
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