CN111704413A - Concrete prepared from waste slurry of concrete mixing plant - Google Patents
Concrete prepared from waste slurry of concrete mixing plant Download PDFInfo
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- CN111704413A CN111704413A CN202010586731.4A CN202010586731A CN111704413A CN 111704413 A CN111704413 A CN 111704413A CN 202010586731 A CN202010586731 A CN 202010586731A CN 111704413 A CN111704413 A CN 111704413A
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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
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/002—Water
- C04B22/0046—Waste slurries or solutions used as gauging water
-
- 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
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2688—Copolymers containing at least three different monomers
- C04B24/2694—Copolymers containing at least three different monomers containing polyether side chains
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses concrete prepared from waste slurry of a concrete mixing plant, which is characterized by being prepared from the following raw materials in parts by weight: 180-350 parts of cement, 120-190 parts of mineral powder, 50-100 parts of coal ash, 820-1520 parts of aggregate, 95-150 parts of clear water and 10-50 parts of waste slurry water with solid content of 4-10%; 8-18 parts of an additive. The concrete prepared by adopting the raw material proportion can reach the grade of C50-C60, and has the characteristics of good fluidity, high density, high pressure resistance and the like.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to concrete prepared from waste slurry of a concrete mixing plant.
Background
After the concrete is produced in the mixing station, oneThe tap water is generally used for washing stirring equipment and stirring vehicle, and the produced waste water not only contains cement which is not completely hydrated, admixture which is not completely hydrated, clay, fine sand and other granular solids, but also contains a lot of hydrated ions, such as Ca2+、OH-Etc., and additives, etc., also remain. If the concrete is used and mixed improperly, the prepared concrete is easy to have the problems of short setting time, cracking, poor impermeability and the like.
Disclosure of Invention
The invention aims to provide concrete prepared from waste slurry of a concrete mixing plant, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the concrete prepared from the waste slurry of the concrete mixing plant is provided, and is prepared from the following raw materials in parts by weight: 180-350 parts of cement, 120-190 parts of mineral powder, 50-100 parts of coal ash, 820-1520 parts of aggregate, 95-150 parts of clear water and 10-50 parts of waste slurry water with solid content of 4-10%; 8-18 parts of an additive.
Preferably, the composition is prepared from the following raw materials in parts by weight: 300 parts of cement, 160 parts of mineral powder, 70 parts of coal ash, 1070 parts of aggregate, 132 parts of clear water and 33 parts of waste slurry with the solid content of 5%; 14 parts of an additive.
Preferably, the composition is prepared from the following raw materials in parts by weight: 348 parts of cement, 186 parts of mineral powder, 95 parts of coal ash, 1480 parts of aggregate, 145 parts of clear water and 40 parts of waste slurry with the solid content of 6.2 percent; 16.5 parts of an additive.
Preferably, the composition is prepared from the following raw materials in parts by weight: 250 parts of cement, 133 parts of mineral powder, 72 parts of coal ash, 850 parts of aggregate, 105 parts of clear water and 25 parts of waste slurry with the solid content of 8%; 16 parts of an additive.
Preferably, the admixture consists of the slump retaining agent and the polycarboxylic acid water reducing agent in parts by weight of 5-12 and 5-12 respectively.
Preferably, the slump retaining agent is prepared from the following raw material components: adding 320g of ethylene glycol monovinyl polyglycol ether with the molecular weight of 3000, 17g of benzyl methacrylate and 300g of deionized water into a 1L three-neck flask, and stirring for dissolving; after complete dissolution, 0.45g of ferrous sulfate, 2.1g of hydrogenated styrene-butadiene-styrene block copolymer and 5.5g of azodiisobutyl amidine hydrochloride are added in sequence, stirred for 5-10 minutes and then added with the solution A, the solution B and the solution C dropwise; wherein the solution A consists of 22g of acrylic acid, 10g of N-vinyl pyrrolidone and 60g of deionized water; the solution B consists of 30g of hydroxyethyl acrylate, 10g of caprolactone acrylate and 80g of deionized water; the solution C consists of 4.0g of mercaptoethanol, 1.0g of sodium formaldehyde sulfoxylate and 100g of deionized water; when dripping, dripping the solution A for 1.5 hours, dripping the solution B for 1.5 hours, and finishing dripping the solution C half hour later than the solution A; after the dripping is finished, the temperature is kept for 1 hour, and deionized water is added to adjust the solution to a finished product with the solid content of 42 percent.
Compared with the prior art, the invention has the following beneficial effects:
1. the concrete prepared by adopting the raw material proportion can reach the grade of C40-C60, and has the characteristics of good fluidity, high density, high pressure resistance and the like.
2. By adopting the technical scheme of the invention, on one hand, direct economic benefits can be obtained: the production cost is reduced, and meanwhile, the cost of transporting and treating the slurry in the waste water as construction waste is reduced, and on the other hand, the waste water is used as mixing water to produce concrete, so that the problem of water resource shortage can be relieved, and the pollution of waste water discharge to the environment can be reduced, thereby realizing the regeneration and cyclic utilization of concrete production, ensuring the sustainable development of the construction industry, and having immeasurable social benefit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The concrete prepared from the waste slurry of the concrete mixing plant is prepared from the following raw materials in parts by weight: 180-350 parts of cement, 120-190 parts of mineral powder, 50-100 parts of coal ash, 820-1520 parts of aggregate, 95-150 parts of clear water (tap water) and 10-50 parts of waste slurry water with solid content of 4-10%; 8-18 parts of an additive. Wherein the cement is Runfeng p.o42.5, the mineral powder is S95 grade mineral powder, the coal ash is II grade, and the aggregate is crushed sand stone with the particle size of 5-25 mm;
more preferably, the waste slurry is formed by precipitating waste water of a concrete mixing plant, the water content of the waste slurry is 45% -50%, and the generation time of the waste slurry is within 24 hours;
preferably, the admixture is a slump retaining agent and a polycarboxylic acid water reducing agent, and the weight parts of the admixture are 5-12 parts and 5-12 parts respectively.
The slump retaining agent is prepared from the following raw materials in parts by weight: adding 320g of ethylene glycol monovinyl polyglycol ether with the molecular weight of 3000, 17g of benzyl methacrylate and 300g of deionized water into a 1L three-neck flask, and stirring for dissolving; after complete dissolution, 0.45g of ferrous sulfate, 2.1g of hydrogenated styrene-butadiene-styrene block copolymer and 5.5g of azodiisobutyl amidine hydrochloride are added in sequence, stirred for 5-10 minutes and then added with the solution A, the solution B and the solution C dropwise; wherein the solution A consists of 22g of acrylic acid, 10g of N-vinyl pyrrolidone and 60g of deionized water; the solution B consists of 30g of hydroxyethyl acrylate, 10g of caprolactone acrylate and 80g of deionized water; the solution C consists of 4.0g of mercaptoethanol, 1.0g of sodium formaldehyde sulfoxylate and 100g of deionized water; when the solution A is dripped, the solution A is dripped for 1.5 hours, the solution B is dripped for 1.5 hours (the solution A and the solution B are simultaneously dripped, the solution C is half an hour later than the solution A, the temperature is kept for 1 hour after the dripping is finished, and the deionized water is supplemented to adjust the solid content to be 42 percent of the finished product.
The polycarboxylic acid water reducing agent is prepared from a high-performance polycarboxylic acid water reducing agent and a preparation method thereof in Chinese patent application number 201710186383. X.
Based on the above formulation, the amounts of the different components were adjusted to give examples 1-5, as specified in the following table:
for the concrete produced by the test of the above 6 examples, the initial slump, the initial expansion and the 16h slump were measured, and concrete test pieces were prepared according to the standard conventional method, wherein 32 concrete test pieces molded by 150 × 150mm test molds were taken from each example, and were cured for 7 days and 28 days at 20 ± 2 ℃ and a relative humidity of more than 95%, and the average value of the test data was obtained, and the properties such as the compressive strength were as follows:
the results show that: the concrete produced in the examples 1-5 belongs to the grade C50-C60, the slump is small, the workability is good, the compressive strength is respectively over 70% and 110% at 7d and 28d, and the concrete meets the regulation of GB50107-2010 concrete strength test evaluation standard, so that the scheme for producing the high-performance concrete by using the waste slurry is feasible.
The principle of the concrete prepared by adopting the waste slurry of the concrete mixing station can reach the high-performance concrete with the grade of C40-C60 is explained as follows:
1. the selected raw materials are simple in components and easy to prepare, and the proportion is scientific and reasonable;
2. for the slurry containing Ca2+、OH-When the concrete is prepared by using the alkaline substances, the slump retaining agent which is specially developed is adopted, the slump retaining agent is subjected to multiple reactions of raw materials, the molecular chain of the obtained product is long, and the longer the chain length is, the slower the hydrolysis rate is, so that the embedded carboxyl is difficult to release, the more difficult the embedded carboxyl is to be adsorbed on the surface of cement particles to realize the dispersion effect, and the occurrence of concrete segregation and bleeding caused by concentrated hydrolysis and release of ester groups is effectively avoided. And the slump retaining agent is adopted to mix the alkaline medium of the waste slurry and cement hydration products with free Ca on one hand2+An unstable complex is formed, the concentration of Ca2+ in the liquid phase is reduced at the initial stage of hydration, the crystallization of CH is delayed, and the reduction of water molecules and OH-Penetration of ions. On the other hand, there are ester monomers having a benzene ring or benzyl group, sinceThe water solubility is small, and the benzene ring and benzyl structures can increase steric hindrance space and inhibit the hydration reaction of the compound, thereby generating a retarding effect. Although the complex compound which is unstable automatically decomposes the concrete during the hydration process and the hydration continues to be normally carried out, the later hydration of the cement is not influenced, so that ester groups on a chain of the complex compound are delayed and protected from being rapidly hydrolyzed, the density and the toughness can be effectively improved, and the adsorption effect can well lock water, cement and mortar, so that the setting time of the concrete is prolonged, the plasticity of the fresh concrete is kept for a long time, and the concrete is prevented from being set to cause pumping blockage due to overlong parking time.
3. The selected polycarboxylate superplasticizer has small molecular weight, effectively reduces the generation of polymers with small molecular weight, further reduces the gas content, and can form various viscous polymeric substances with stable forms with slump retaining agents with different long chain lengths when being mixed with the slump retaining agents with different long chain lengths for use, thereby having the effect of replacing part of cementing materials, not only reducing the using amount of the cementing materials and water in concrete raw materials, but also adsorbing and gathering powder due to the viscosity of the polycarboxylate superplasticizer, improving the compactness of concrete, improving the dispersibility of the polycarboxylate superplasticizer and prolonging the setting time of the concrete. And the composite slump retaining agent is combined with a high slump retaining agent for use, so that the slump and the fluidity of the concrete can be maintained for a long time, and the purpose of long-distance transportation of the concrete is achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The concrete prepared from the waste slurry of the concrete mixing plant is characterized by being prepared from the following raw materials in parts by weight: 180-350 parts of cement, 120-190 parts of mineral powder, 50-100 parts of coal ash, 820-1520 parts of aggregate, 95-150 parts of clear water and 10-50 parts of waste slurry water with solid content of 4-10%; 8-18 parts of an additive.
2. The concrete prepared from the waste slurry of the concrete mixing plant according to claim 1, wherein: the composition is prepared from the following raw materials in parts by weight: 300 parts of cement, 160 parts of mineral powder, 70 parts of coal ash, 1070 parts of aggregate, 132 parts of clear water and 33 parts of waste slurry with the solid content of 5%; 14 parts of an additive.
3. The concrete prepared from the waste slurry of the concrete mixing plant according to claim 1, wherein: the composition is prepared from the following raw materials in parts by weight: 348 parts of cement, 186 parts of mineral powder, 95 parts of coal ash, 1480 parts of aggregate, 145 parts of clear water and 40 parts of waste slurry with the solid content of 6.2 percent; 16.5 parts of an additive.
4. The concrete prepared from the waste slurry of the concrete mixing plant according to claim 1, wherein: the composition is prepared from the following raw materials in parts by weight: 250 parts of cement, 133 parts of mineral powder, 72 parts of coal ash, 850 parts of aggregate, 105 parts of clear water and 25 parts of waste slurry with the solid content of 8%; 16 parts of an additive.
5. The concrete prepared from the waste slurry of the concrete mixing plant according to any one of claims 1 to 4, wherein: the admixture consists of 5-12 parts of slump retaining agent and 5-12 parts of polycarboxylic acid water reducing agent by mass.
6. The concrete prepared from the waste slurry of the concrete mixing plant according to claim 5, wherein: the slump retaining agent is prepared from the following raw material components: adding 320g of ethylene glycol monovinyl polyglycol ether with the molecular weight of 3000, 17g of benzyl methacrylate and 300g of deionized water into a 1L three-neck flask, and stirring for dissolving; after complete dissolution, 0.45g of ferrous sulfate, 2.1g of hydrogenated styrene-butadiene-styrene block copolymer and 5.5g of azodiisobutyl amidine hydrochloride are added in sequence, stirred for 5-10 minutes and then added with the solution A, the solution B and the solution C dropwise; wherein the solution A consists of 22g of acrylic acid, 10g of N-vinyl pyrrolidone and 60g of deionized water; the solution B consists of 30g of hydroxyethyl acrylate, 10g of caprolactone acrylate and 80g of deionized water; the solution C consists of 4.0g of mercaptoethanol, 1.0g of sodium formaldehyde sulfoxylate and 100g of deionized water; when dripping, dripping the solution A for 1.5 hours, dripping the solution B for 1.5 hours, and finishing dripping the solution C half hour later than the solution A; after the dripping is finished, the temperature is kept for 1 hour, and deionized water is added to adjust the solution to a finished product with the solid content of 42 percent.
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| CN202010586731.4A CN111704413A (en) | 2020-06-24 | 2020-06-24 | Concrete prepared from waste slurry of concrete mixing plant |
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| CN202010586731.4A CN111704413A (en) | 2020-06-24 | 2020-06-24 | Concrete prepared from waste slurry of concrete mixing plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112939552A (en) * | 2021-04-23 | 2021-06-11 | 北京金隅混凝土有限公司 | Concrete prepared from mixing station waste slurry and preparation method thereof |
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| CN112939552A (en) * | 2021-04-23 | 2021-06-11 | 北京金隅混凝土有限公司 | Concrete prepared from mixing station waste slurry and preparation method thereof |
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