CN112125633A - C30 grade full-solid waste concrete and preparation method thereof - Google Patents
C30 grade full-solid waste concrete and preparation method thereof Download PDFInfo
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- CN112125633A CN112125633A CN202011158030.7A CN202011158030A CN112125633A CN 112125633 A CN112125633 A CN 112125633A CN 202011158030 A CN202011158030 A CN 202011158030A CN 112125633 A CN112125633 A CN 112125633A
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- 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
- C04B28/18—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 mixtures of the silica-lime type
- C04B28/186—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 mixtures of the silica-lime type containing formed Ca-silicates before the final hardening step
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention provides C30-grade full-solid waste concrete and a preparation method thereof, wherein the cement is replaced by an alkali residue-carbide residue synergistic excitation slag-fly ash composite cementing material, and the traditional sand stone is replaced by iron tailing sand stone. The all-solid waste concrete comprises the following components in parts by weight: 52-156 parts of alkaline residue, 26-78 parts of carbide slag, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing and 1-3 parts of polycarboxylic acid water reducer. The invention uses various industrial solid waste residues to prepare a new full-solid waste concrete, the 28d strength reaches more than 30MPa, the waste is changed into valuable, the environment is protected, and the production cost is reduced.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to C30 grade full-solid waste concrete prepared from alkaline residue, carbide slag, fly ash and iron tailing sand and stones and a preparation method thereof.
Background
With the development of industrial production, the amount of industrial waste is increasing. Especially the largest industrial discharge amount of metallurgy, thermal power generation and the like. The industrial waste is large in quantity, various in types, complex in components and quite difficult to treat. Today, only a limited number of industrial wastes are utilized, such as steel slag in the united states, sweden, etc., and fly ash and coal slag in japan, denmark, etc. Other industrial wastes are mainly stored in a passive manner, and part of harmful industrial solid wastes are treated by methods such as landfill, incineration, chemical conversion, microbial treatment and the like; some are thrown into the ocean. The comprehensive utilization of bulk industrial solid wastes is an important measure for realizing transformation and upgrading of industry at present, and is a long-term strategic policy for ensuring the sustainable development of the industry in China. However, the disposal of industrial solid wastes is still a problem that plagues the environmental sector.
The caustic sludge which is one of the industrial solid wastes is industrial waste sludge generated in the process of producing soda ash by an ammonia-soda process, 300-600kg of caustic sludge is generated every 1t of soda ash is produced, and according to the latest statistics, nearly 780 ten thousand tons of caustic sludge are discharged in China every year. At present, the clear liquid of the caustic sludge is better recycled, the filter-pressed caustic sludge is stored in a storage yard, the resource utilization degree is lower, the caustic sludge storage yard is increased year by year, and related enterprises spend huge funds on handling the caustic sludge stacking problem every year, so the environmental pressure is increased day by day.
The iron tailings which are one of industrial solid wastes are solid wastes generated after iron ores are refined, and in view of the limited iron tailings recovery technology in China at present, most iron and steel enterprises adopt a tailing pond building mode to stack the iron and steel tailings. According to incomplete statistics, the accumulated tailings produced in China currently exceed 100 hundred million tons, wherein the quantity of the iron tailings stored in the accumulated tailings accounts for about 1/3, and the comprehensive utilization rate of the tailings is only 7%. The iron tailings are stockpiled to bring about a plurality of environmental problems, such as environmental pollution, ecological balance destruction, land occupation in stockpiling and the like.
Aiming at the problem that the solid wastes such as alkaline residue, iron tailings and the like are piled in a large area and need to be treated urgently. At present, the research and development of concrete according to the physicochemical properties of various industrial solid wastes are green, low-carbon and sustainable important development directions in the cement concrete industry.
Researchers find that the alkaline residue is rich in alkaline substances and calcium, silicon and aluminum components, has intersection with portland cement components and is a potential raw material for preparing the alkali-activated cementing material, the application of slag and fly ash serving as active mixed materials and doped into cement or mineral admixtures and doped into concrete or serving as the cementing components for preparing the alkali-activated cementing material is mature, and the application research of iron tailings for preparing the concrete by replacing common sandstone aggregates is also mature. If the alkali slag can be used as an alkali-activated cementing material and the iron tailings are used for solid waste at the same time, the solid waste concrete with useful value is prepared, and the long-term influence on the alkali slag solid waste treatment industry is undoubtedly generated.
However, conventionally, solid waste concrete obtained by using alkali slag as an alkali-activated cementitious material is very unsatisfactory in terms of strength. The inventor of the invention finds that the strength of concrete directly using alkali slag as an alkali-activated cementing material even can not reach the grade of C20, and the application of the concrete is greatly limited due to the low strength.
Therefore, under the present circumstances, the use of industrial alkaline residue as a raw material for solid waste concrete is still in a state of very poor commercial value and practical value, and how to develop concrete having alkaline residue as a raw material for solid waste concrete and having more useful value in strength is a problem to be solved
Disclosure of Invention
In order to solve the above problems, the inventors have conducted intensive studies and continuously tried new formulations, and as a result, found that: when the alkali slag is used for the alkali-activated cementing material alone, the strength of the concrete is not enough, but when a proper amount of carbide slag is mixed in the alkali slag, the alkali slag and the carbide slag are used for the alkali-activated cementing material together, and the strength of the concrete can be greatly improved.
The carbide slag is also one of industrial solid wastes, is waste slag which is generated after acetylene gas is obtained by hydrolyzing carbide and takes calcium hydroxide as a main component, has large quantity, contains harmful substances such as sulfur, arsenic and the like, and can block sewers, block riverbeds and damage fishery production when discharged without treatment. Since the strength of concrete obtained by using carbide slag alone as the alkali-activated cementitious material is also poor, carbide slag is not the alkali-activated cementitious material of conventional slag concrete. The inventors have also demonstrated that carbide slag alone, when used as an alkali-activated cementitious material, has a strength that is far from the strength of class C30 (see in particular the examples section that follows). However, the alkali slag and the carbide slag synergistically act as the alkali-activated cementitious material to greatly improve the strength of concrete, and based on such unique synergistic effects, the inventors have completed the following invention.
Specifically, the invention provides a full solid waste concrete, which comprises the following components: the water reducing agent comprises the following components in parts by weight: 52-156 parts of alkaline residue, 26-78 parts of carbide slag, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing and 1-3 parts of polycarboxylic acid water reducer, wherein the concrete strength grade is above C30 grade.
Preferably, the slag is ground slag grade S95.
Preferably, the fly ash is class F II fly ash.
Preferably, the iron tailing sand is prepared by mechanically crushing and sand-making waste tailings in mining, wherein the particle size is 0.15-2.36 mm, the fineness modulus is 2.3-3.0, and the mud content is less than 0.5%.
Preferably, the iron tailing stone is obtained by mechanically crushing and screening waste tailings in mining, the particle size is 4.75-20.00 mm, and the crushing index is less than 16%.
The invention also provides a preparation method of the all-solid waste concrete, which comprises the following steps:
s1, standing and layering the alkaline residue and the carbide slag stock solution to respectively obtain alkaline residue, upper clear liquid of the carbide slag and lower slurry, and separately storing the upper clear liquid and the lower slurry for later use;
s2, pretreating the alkaline residue and the slurry at the lower part of the carbide slag, naturally airing, crushing and sieving the alkaline residue and the slurry to obtain alkaline residue powder and carbide slag powder respectively, and then bagging the alkaline residue powder and the carbide slag powder respectively for moisture prevention;
s3, sequentially adding the alkali slag powder, the carbide slag powder, the slag and the fly ash into a mixing container according to a preset mass ratio, and uniformly stirring to obtain a composite cementing material mixture;
and S4, adding the composite cementitious material mixture prepared in the step S3 and iron tailing sand into a stirrer, stirring for 30-60 seconds, adding iron tailing, stirring for 30-60 seconds, adding part of the upper clear liquid of the carbide slag and a water reducing agent, stirring for 1-2 minutes, adding the rest of the upper clear liquid of the carbide slag and the water reducing agent, and stirring for 2-3 minutes to obtain the all-solid waste concrete.
Preferably, the supernatant of the carbide slag in step S1 is subjected to OH control-The concentration is 0.032-0.063 mol/L, and the pH value is 12.5-12.8.
Preferably, the water content of the slurry at the lower part of the caustic sludge and the carbide slag in the step S1 is controlled to be 50-60%.
Preferably, the sieve pore size in step S2 is 0.075-0.300 mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the conventional activator for preparing the alkali-activated cementing material or alkali-activated concrete is mostly strong alkali such as NaOH or water glass, and the cost is high. According to the invention, no strong alkali is used, and the slag-fly ash is excited by complementary and synergistic key alkaline components contained in the alkaline residue and the carbide slag to form the cementing material with a certain strength, so that the full utilization of the waste alkali is realized, and the production cost of the alkali-excited cementing material can be effectively reduced.
(2) The C30 grade full solid waste concrete raw material is completely derived from industrial solid waste, realizes synergistic treatment according to the physicochemical properties of alkali slag, carbide slag, fly ash and iron tailing sandstone, changes waste into valuable, and can effectively reduce the environmental pollution problem caused by various industrial solid waste.
(3) The invention replaces cement with the full solid waste cementing material, replaces common sandstone with iron tailing sandstone, can reduce the problems of high energy consumption and high pollution generated by the production of portland cement to a certain extent, reduces the pressure of excessive stone exploitation and insufficient natural aggregate, reduces the production cost of concrete, and better meets the requirements of energy conservation, emission reduction and green sustainable development.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention.
As described above, the all solid waste concrete of the present invention comprises the following components: the slag-type water reducing agent comprises the following components in parts by weight: 52-156 parts of alkaline residue, 26-78 parts of carbide slag, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing and 1-3 parts of polycarboxylic acid water reducer.
The invention realizes the solid waste concrete, and the alkali slag-carbide slag synergistically excites the slag-fly ash to form a novel hydraulic cementing material which replaces Portland cement in a large amount; then, iron tailing sand stone is used for replacing common sand stone to prepare the full-solid waste concrete. The invention does not use cement, does not use strong alkali (NaOH, water glass and the like), utilizes a certain amount of waste alkali contained in the alkaline residue to excite the slag-fly ash to form a cementing material with certain strength, can effectively replace the cement, and simultaneously effectively utilizes another industrial solid waste, namely the carbide slag, thereby realizing the synergistic utilization of multiple solid wastes, reducing the environmental pollution and lowering the production cost while achieving the design strength. Meanwhile, the alkali residue-carbide residue alkali-activated cementing material can be well matched with iron tailings solid waste serving as an active mixed material, so that the full-solid waste concrete provided by the invention can be obtained.
The synergistic effect of the caustic sludge and the carbide sludge as the alkali-activated cementitious material is the first discovery of the present inventors. The present inventors speculate that the reason for this synergistic effect is: CaCl in caustic sludge2、CaSO4、CaCO3Can excite slag-fly ash to generate C-S-H gel and hydrated calcium chloroaluminate (3 CaO. Al)2O3·CaCl2·10H2O), calcium hydrocarbonate aluminate (7 CaO.2Al)2O3·CaCO3·24H2O), sodium chloride (NaCl) and the like. Large in carbide slagAmount Ca (OH)2Can excite slag-fly ash to generate C-S-H, C-A-H gel and hydrated calcium sulphoaluminate (3 CaO. Al)2O3·3CaSO4·30H2And when the two are mixed for use, the key alkaline components are complementary, and if the optimized proportion mixing is adopted, the C-S-H, C-A-H gel can be generated more and more quickly, the crystal type hydration products are more abundant and are filled in the micro cracks on the surface and inside of the gel, so that the strength of the concrete is further improved, and the early strength and the later strength are greatly improved. In contrast, the alkaline residue alone or the carbide residue alone hardly achieves the above-described effects, and the strength cannot be improved, as will be specifically shown in the following examples.
From the viewpoint of further improvement in strength and operability, the slag is preferably ground slag of grade S95; the fly ash is preferably F II grade fly ash; the iron tailing sand is prepared by mechanically crushing and sand-making waste tailings in mining, wherein the particle size is 0.15-2.36 mm, the fineness modulus is 2.3-3.0, and the mud content is less than 0.5%; the iron tailing stone is obtained by mechanically crushing and screening waste tailings in mining, the particle size is 4.75-20.00 mm, and the crushing index is less than 16%.
Technically, the concrete with high strength can be realized based on the technical scheme, but according to related laws and regulations, the properties of the raw materials need to meet the requirements of related regulations, such as GB/T14684-2011 'construction sand', GB/T14685-2011 'construction pebbles and gravels'.
The preparation method of the all-solid waste concrete can be a common concrete preparation method, and only relevant raw materials are replaced by the alkaline residue-carbide slag, fly ash and iron tailing sand stone. But in order to be able to achieve better strength, it is preferably prepared by the following steps:
s1, standing and layering the alkaline residue and the carbide slag stock solution to respectively obtain alkaline residue, upper clear liquid of the carbide slag and lower slurry, and separately storing the upper clear liquid and the lower slurry for later use; supernatant of carbide slag, OH-The concentration is 0.032-0.063 mol/L, and the pH value is 12.5-12.8; the water content of the lower part of the alkaline residue and the carbide residue is 50 to 60 percent.
S2, pretreating the slurry at the lower parts of the alkali slag and the carbide slag, naturally airing, crushing and sieving by a 0.15mm sieve to respectively obtain alkali slag powder and carbide slag powder, and then respectively bagging and carrying out moisture prevention for later use;
s3, sequentially adding alkali slag powder, carbide slag powder, slag and fly ash into a mixing container according to a preset mass ratio, and uniformly stirring to obtain a composite cementitious material mixture;
and S4, adding the composite cementitious material mixture prepared in the step S3 and iron tailing sand into a stirrer, stirring for 30-60 seconds, adding iron tailing, stirring for 30-60 seconds, adding part of the upper clear liquid of the carbide slag and a water reducing agent, stirring for 1-2 minutes, adding the rest of the upper clear liquid of the carbide slag and the water reducing agent, and stirring for 2-3 minutes to obtain the all-solid waste concrete.
The present invention will be described in more detail with reference to the following examples, which are provided for illustration of the present invention and are not intended to limit the scope of the present invention.
Example 1:
the alkali slag, the carbide slag, the fly ash, the iron tailing sand, the iron tailing ore and the water reducing agent are calculated according to the parts by weight: 52-156 parts of alkaline residue, 26-78 parts of carbide slag, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing and 1-3 parts of polycarboxylic acid water reducer.
The concrete formulation of the solid waste concrete is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)：
According to the mixing proportion, the preparation method comprises the following specific steps:
s1, standing and layering the alkaline residue and the carbide slag stock solution to respectively obtain alkaline residue, upper clear liquid of the carbide slag and lower slurry, and separately storing the upper clear liquid and the lower slurry for later use;
s2, pretreating the slurry at the lower parts of the alkali slag and the carbide slag, naturally airing, crushing and sieving by a 0.15mm sieve to respectively obtain alkali slag powder and carbide slag powder, and then respectively bagging and carrying out moisture prevention for later use;
s3, sequentially adding alkali slag powder, carbide slag powder, slag and fly ash into a mixing container according to a preset mass ratio, and uniformly stirring to obtain a composite cementitious material mixture;
s4, adding the composite cementitious material mixture prepared in the step S3 and iron tailing sand into a stirrer, stirring for 30S, adding the iron tailing sand, stirring for 30S, adding part of the upper clear liquid of the carbide slag and a water reducing agent, stirring for 1min, adding the remaining upper clear liquid of the carbide slag and the water reducing agent, and stirring for 2min to obtain the C30-grade all-solid waste concrete.
S5, placing the concrete into a mold coated with a release agent and having a size of 150mmx150mmx150mm, uniformly smashing the concrete, and placing the concrete on a vibration table for vibration molding;
s7, placing the mould filled with the concrete in a standard curing condition with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing for 24h for demoulding, and continuing to place the mould in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing to the design age. Sample 1 was obtained.
Comparative example 1:
the difference from example 1 is that this comparative example does not add carbide slag and the other operations are substantially the same.
In the test, the alkali slag, the fly ash, the iron tailing sand, the iron tailing ore and the water reducing agent are calculated according to the parts by weight: 104-208 parts of alkaline residues, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing and 1-3 parts of polycarboxylic acid water reducing agent.
The concrete formulation of the solid waste concrete is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)：
According to the mixing proportion, the preparation method comprises the following specific steps:
s1, standing and layering the alkaline residue stock solution to respectively obtain an upper clear liquid and a lower slurry of the alkaline residue, and separately storing the upper clear liquid and the lower slurry for later use;
s2, pretreating the slurry at the lower part of the caustic sludge, naturally airing, crushing and sieving by a 0.15mm sieve to respectively obtain caustic sludge powder, and then bagging and carrying out moisture prevention for later use;
s3, sequentially adding the alkali slag powder, the slag and the fly ash into a mixing container according to a preset mass ratio, and uniformly stirring to obtain a composite cementitious material mixture;
s4, adding the composite cementitious material mixture prepared in the step S3 and iron tailing sand into a stirrer, stirring for 30S, adding iron tailing stone, stirring for 30S, adding part of the supernatant of the alkaline residue and a water reducing agent, stirring for 1min, adding the rest of the supernatant of the alkaline residue and the water reducing agent, and stirring for 2min to obtain the all-solid waste concrete.
S5, placing the concrete into a mold coated with a release agent and having a size of 150mmx150mmx150mm, uniformly smashing the concrete, and placing the concrete on a vibration table for vibration molding;
s7, placing the mould filled with the concrete in a standard curing condition with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing for 24h for demoulding, and continuing to place the mould in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing to the design age. Comparative sample 1 was obtained.
Comparative example 2:
the difference from example 1 is that this comparative example does not add caustic sludge, and the other operations are substantially the same.
In the test, the carbide slag, the fly ash, the iron tailing sand, the iron tailing ore and the water reducing agent are calculated according to the parts by weight: 104-208 parts of carbide slag, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing and 1-3 parts of polycarboxylic acid water reducer.
The concrete formulation of the solid waste concrete is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)：
According to the mixing proportion, the preparation method comprises the following specific steps:
s1, standing and layering the carbide slag stock solution to respectively obtain upper clear liquid and lower slurry of the carbide slag, and separately storing the upper clear liquid and the lower slurry for later use;
s2, pretreating the slurry at the lower part of the carbide slag, naturally airing, crushing and sieving by a 0.15mm sieve to respectively obtain carbide slag powder, and then bagging and carrying out moisture prevention for later use;
s3, sequentially adding carbide slag powder, slag and fly ash into a mixing container according to a preset mass ratio, and uniformly stirring to obtain a composite cementitious material mixture;
and S4, adding the composite cementitious material mixture prepared in the step S3 and iron tailing sand into a stirrer, stirring for 30S, adding the iron tailing sand, stirring for 30S, adding part of the clear liquid on the upper part of the carbide slag and a water reducing agent, stirring for 1min, adding the rest of the clear liquid on the upper part of the carbide slag and the water reducing agent, and stirring for 2min to obtain the all-solid waste concrete.
S5, placing the concrete into a mold coated with a release agent and having a size of 150mmx150mmx150mm, uniformly smashing the concrete, and placing the concrete on a vibration table for vibration molding;
s7, placing the mould filled with the concrete in a standard curing condition with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing for 24h for demoulding, and continuing to place the mould in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing to the design age. Comparative sample 2 was obtained.
Example 2:
the alkali slag, the carbide slag, the fly ash, the iron tailing sand, the iron tailing ore and the water reducing agent are calculated according to the parts by weight: 52-156 parts of alkaline residue, 26-78 parts of carbide slag, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing and 1-3 parts of polycarboxylic acid water reducer.
The concrete formulation of the solid waste concrete is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)：
According to the mixing proportion, the preparation method comprises the following specific steps:
s1, standing and layering the alkaline residue and the carbide slag stock solution to respectively obtain alkaline residue, upper clear liquid of the carbide slag and lower slurry, and separately storing the upper clear liquid and the lower slurry for later use;
s2, pretreating the slurry at the lower parts of the alkali slag and the carbide slag, naturally airing, crushing and sieving by a 0.15mm sieve to respectively obtain alkali slag powder and carbide slag powder, and then respectively bagging and carrying out moisture prevention for later use;
s3, sequentially adding alkali slag powder, carbide slag powder, slag and fly ash into a mixing container according to a preset mass ratio, and uniformly stirring to obtain a composite cementitious material mixture;
s4, adding the composite cementitious material mixture prepared in the step S3 and iron tailing sand into a stirrer, stirring for 30S, adding the iron tailing sand, stirring for 30S, adding part of the upper clear liquid of the carbide slag and a water reducing agent, stirring for 1min, adding the remaining upper clear liquid of the carbide slag and the water reducing agent, and stirring for 2min to obtain the C30-grade all-solid waste concrete.
S5, placing the concrete into a mold coated with a release agent and having a size of 150mmx150mmx150mm, uniformly smashing the concrete, and placing the concrete on a vibration table for vibration molding;
s7, placing the mould filled with the concrete in a standard curing condition with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing for 24h for demoulding, and continuing to place the mould in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing to the design age. Sample 2 was obtained.
Example 3:
the alkali slag, the carbide slag, the fly ash, the iron tailing sand, the iron tailing ore and the water reducing agent are calculated according to the parts by weight: 52-156 parts of alkaline residue, 26-78 parts of carbide slag, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing and 1-3 parts of polycarboxylic acid water reducer.
The concrete formulation of the solid waste concrete is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)：
According to the mixing proportion, the preparation method comprises the following specific steps:
s1, standing and layering the alkaline residue and the carbide slag stock solution to respectively obtain alkaline residue, upper clear liquid of the carbide slag and lower slurry, and separately storing the upper clear liquid and the lower slurry for later use;
s2, pretreating the slurry at the lower parts of the alkali slag and the carbide slag, naturally airing, crushing and sieving by a 0.15mm sieve to respectively obtain alkali slag powder and carbide slag powder, and then respectively bagging and carrying out moisture prevention for later use;
s3, sequentially adding alkali slag powder, carbide slag powder, slag and fly ash into a mixing container according to a preset mass ratio, and uniformly stirring to obtain a composite cementitious material mixture;
s4, adding the composite cementitious material mixture prepared in the step S3 and iron tailing sand into a stirrer, stirring for 30S, adding the iron tailing sand, stirring for 30S, adding part of the upper clear liquid of the carbide slag and a water reducing agent, stirring for 1min, adding the remaining upper clear liquid of the carbide slag and the water reducing agent, and stirring for 2min to obtain the C30-grade all-solid waste concrete.
S5, placing the concrete into a mold coated with a release agent and having a size of 150mmx150mmx150mm, uniformly smashing the concrete, and placing the concrete on a vibration table for vibration molding;
s7, placing the mould filled with the concrete in a standard curing condition with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing for 24h for demoulding, and continuing to place the mould in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing to the design age. Sample 3 was obtained.
Example 4:
the alkali slag, the carbide slag, the fly ash, the iron tailing sand, the iron tailing ore and the water reducing agent are calculated according to the parts by weight: 52-156 parts of alkaline residue, 26-78 parts of carbide slag, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing and 1-3 parts of polycarboxylic acid water reducer.
The concrete formulation of the solid waste concrete is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)：
According to the mixing proportion, the preparation method comprises the following specific steps:
s1, standing and layering the alkaline residue and the carbide slag stock solution to respectively obtain alkaline residue, upper clear liquid of the carbide slag and lower slurry, and separately storing the upper clear liquid and the lower slurry for later use;
s2, pretreating the slurry at the lower parts of the alkali slag and the carbide slag, naturally airing, crushing and sieving by a 0.15mm sieve to respectively obtain alkali slag powder and carbide slag powder, and then respectively bagging and carrying out moisture prevention for later use;
s3, sequentially adding alkali slag powder, carbide slag powder, slag and fly ash into a mixing container according to a preset mass ratio, and uniformly stirring to obtain a composite cementitious material mixture;
s4, adding the composite cementitious material mixture prepared in the step S3 and iron tailing sand into a stirrer, stirring for 30S, adding the iron tailing sand, stirring for 30S, adding part of the upper clear liquid of the carbide slag and a water reducing agent, stirring for 1min, adding the remaining upper clear liquid of the carbide slag and the water reducing agent, and stirring for 2min to obtain the C30-grade all-solid waste concrete.
S5, placing the concrete into a mold coated with a release agent and having a size of 150mmx150mmx150mm, uniformly smashing the concrete, and placing the concrete on a vibration table for vibration molding;
s7, placing the mould filled with the concrete in a standard curing condition with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing for 24h for demoulding, and continuing to place the mould in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing to the design age. Sample 4 was obtained.
Example 5:
the alkali slag, the carbide slag, the fly ash, the iron tailing sand, the iron tailing ore and the water reducing agent are calculated according to the parts by weight: 52-156 parts of alkaline residue, 26-78 parts of carbide slag, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing and 1-3 parts of polycarboxylic acid water reducer.
The concrete formulation of the solid waste concrete is shown in the following table: (amount of concrete material used per cubic unit: kg/m)3)：
According to the mixing proportion, the preparation method comprises the following specific steps:
s1, standing and layering the alkaline residue and the carbide slag stock solution to respectively obtain alkaline residue, upper clear liquid of the carbide slag and lower slurry, and separately storing the upper clear liquid and the lower slurry for later use;
s2, pretreating the slurry at the lower parts of the alkali slag and the carbide slag, naturally airing, crushing and sieving by a 0.15mm sieve to respectively obtain alkali slag powder and carbide slag powder, and then respectively bagging and carrying out moisture prevention for later use;
s3, sequentially adding alkali slag powder, carbide slag powder, slag and fly ash into a mixing container according to a preset mass ratio, and uniformly stirring to obtain a composite cementitious material mixture;
s4, adding the composite cementitious material mixture prepared in the step S3 and iron tailing sand into a stirrer, stirring for 30S, adding the iron tailing sand, stirring for 30S, adding part of the upper clear liquid of the carbide slag and a water reducing agent, stirring for 1min, adding the remaining upper clear liquid of the carbide slag and the water reducing agent, and stirring for 2min to obtain the C30-grade all-solid waste concrete.
S5, placing the concrete into a mold coated with a release agent and having a size of 150mmx150mmx150mm, uniformly smashing the concrete, and placing the concrete on a vibration table for vibration molding;
s7, placing the mould filled with the concrete in a standard curing condition with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing for 24h for demoulding, and continuing to place the mould in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of not less than 95% for curing to the design age. Sample 5 was obtained.
The samples 1 to 5 prepared in the above examples were subjected to slump test, 3d strength test, 7d strength test and 28d strength test, and the test results are shown in Table 1.
TABLE 1 Total solid waste concrete sample Properties
| Sample numbering | Slump (mm) | 3d Strength (MPa) | 7d Strength (MPa) | 28d Strength (MPa) |
| Sample 1 | 76 | 13.4 | 23.0 | 36.3 |
| Comparative sample 1 | 67 | 5.3 | 8.7 | 18.5 |
| Comparative sample 2 | 83 | 10.6 | 15.3 | 24.8 |
| Sample 2 | 63 | 13.9 | 24.2 | 38.2 |
| Sample 3 | 55 | 12.7 | 21.9 | 34.8 |
| Sample No. 4 | 66 | 14.5 | 24.9 | 39.2 |
| Sample No. 5 | 84 | 14.1 | 24.6 | 38.8 |
As shown in table 1, the strength of sample 1 at each age is higher than that of comparative samples 1 and 2, which indicates that the alkaline residue and the carbide residue can show better synergistic excitation effect after being mixed in an optimized proportion. The concrete mixture slump of samples 1-5 is greater than 50mm, which belongs to the category of moulding concrete, the 28d compressive strength reaches more than 30MPa, the comprehensive performance difference is small, but the compressive strength of sample 4 is relatively high. Therefore, the invention uses industrial waste residues stacked in large area, and the prepared full-solid waste concrete can be applied to non-reinforced products, changes waste into valuable, reduces the production cost while protecting the environment, and has huge industrial popularization prospect and economic benefit.
The technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention to achieve the aim of the invention, and various modifications made to the technical scheme of the invention by those skilled in the art without departing from the design spirit of the invention shall fall within the protection scope defined by the claims of the invention.
Claims (9)
1. The full-solid waste concrete is characterized by comprising the following components in parts by weight: 52-156 parts of alkaline residue, 26-78 parts of carbide slag, 182-234 parts of slag, 104-208 parts of fly ash, 170-190 parts of water, 460-510 parts of iron tailing sand, 1030-1150 parts of iron tailing, and 1-3 parts of polycarboxylic acid water reducer, wherein the concrete strength grade is above C30 grade.
2. The solid waste concrete of claim 1, wherein the slag is grade S95 ground slag.
3. The solid waste concrete of claim 1, wherein the fly ash is class F II fly ash.
4. The all-solid waste concrete as claimed in claim 1, wherein the iron tailing sand is prepared by mechanically crushing and sand-making waste tailings in mining, the particle size is 0.15-2.36 mm, the fineness modulus is 2.3-3.0, and the mud content is less than 0.5%.
5. The all-solid waste concrete according to claim 1, wherein the iron tailing stones are obtained by mechanically crushing and screening waste tailings in mining, the particle size is 4.75 mm-20.00 mm, and the crushing index is less than 16%.
6. A method for preparing the whole solid waste concrete according to any one of claims 1 to 5, characterized in that it comprises the following steps:
s1, standing and layering the alkaline residue and the carbide slag stock solution to respectively obtain alkaline residue, upper clear liquid of the carbide slag and lower slurry, and separately storing the upper clear liquid and the lower slurry for later use;
s2, pretreating the alkaline residue and the slurry at the lower part of the carbide slag, naturally airing, crushing and sieving the alkaline residue and the slurry to obtain alkaline residue powder and carbide slag powder respectively, and then bagging the alkaline residue powder and the carbide slag powder respectively for moisture prevention;
s3, sequentially adding the alkali slag powder, the carbide slag powder, the slag and the fly ash into a mixing container according to a preset mass ratio, and uniformly stirring to obtain a composite cementing material mixture;
and S4, adding the composite cementitious material mixture prepared in the step S3 and iron tailing sand into a stirrer, stirring for 30-60 seconds, adding iron tailing, stirring for 30-60 seconds, adding part of the upper clear liquid of the carbide slag and a water reducing agent, stirring for 1-2 minutes, adding the rest of the upper clear liquid of the carbide slag and the water reducing agent, and stirring for 2-3 minutes to obtain the all-solid waste concrete.
7. The method for producing all-solid waste concrete according to claim 6, wherein OH of the supernatant of the carbide slag is controlled in step S1-The concentration is 0.032-0.063 mol/L, and the pH value is 12.5-12.8.
8. The method for preparing all-solid waste concrete according to claim 6, wherein the water content of the slurry at the lower part of the caustic sludge and the carbide sludge in step S1 is controlled to be 50-60%.
9. The method for preparing the all solid waste concrete according to claim 6, wherein the sieve diameter in step S2 is 0.075-0.300 mm.
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