CN111908852A - Concrete for prefabricated part and preparation method thereof - Google Patents
Concrete for prefabricated part and preparation method thereof Download PDFInfo
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- CN111908852A CN111908852A CN202010884636.2A CN202010884636A CN111908852A CN 111908852 A CN111908852 A CN 111908852A CN 202010884636 A CN202010884636 A CN 202010884636A CN 111908852 A CN111908852 A CN 111908852A
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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
-
- 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
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
-
- 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
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
- C08F251/02—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof on to cellulose or derivatives thereof
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/65—Water proofers or repellants
-
- 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
Abstract
The concrete for the prefabricated part comprises, by weight, 180 parts of cement 120-130 parts, 80-130 parts of sand, 300 parts of gravel 220-one, 60-100 parts of slag powder, 13-18.5 parts of a high-efficiency water reducing agent, 1-3 parts of a waterproof anti-permeability agent and 80-120 parts of water, wherein the high-efficiency water reducing agent is formed by copolymerization of acrylic acid, unsaturated polyoxyethylene ether and maleic anhydride modified cellulose serving as comonomers; according to the invention, the high-efficiency water reducing agent is introduced into the concrete, wherein the high-efficiency water reducing agent is prepared by copolymerization of acrylic acid, unsaturated polyoxyethylene ether and maleic anhydride modified cellulose serving as comonomers, vinyl groups are introduced to a cellulose chain through maleic acylation of the maleic anhydride modified cellulose, the cellulose chain and the unsaturated polyoxyethylene ether are subjected to copolymerization, and carboxyl groups generated after ring opening of the cellulose and the maleic anhydride are introduced to a main chain of the high-efficiency water reducing agent, so that the density of the carboxyl groups of the high-efficiency water reducing agent is increased, and the slump of the concrete is kept good.
Description
Technical Field
The invention belongs to the field of concrete admixtures, and particularly relates to concrete for a prefabricated part and a preparation method thereof.
Background
Concrete is a general term for engineering composite materials in which aggregate is cemented into a whole by a cementing material. The concrete is usually cement as cementing material and sand and stone as aggregate; mixing with water (containing additive or admixture) according to a certain proportion, and stirring to obtain the cement concrete, also called as common concrete;
the invention discloses a concrete which mainly comprises cement, mineral powder, fly ash, stones, scraps, sand, water, a water reducing agent and a CFT concrete synergist, wherein the concrete adopts the scraps with the fineness modulus of 3.2 to replace most of the sand and part of the stones, the water requirement is slightly more than that in the prior art, the CTF concrete synergist can be fully exerted to improve the dispersibility of cement particles, the effect of the water reducing agent is improved, the problems of shortening of setting time and the like are solved, the excellent slump, workability and compressive strength are ensured, but the concrete adopts a common water reducing agent, the water reducing effect is 15-25%, and the water reducing effect is difficult to improve from the surface of a molecular layer. When the concrete expands, the concrete is stressed in compression, and the reinforcing steel bars are stressed in tension; when the concrete is dried or cooled, cracks are easy to generate.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides concrete for prefabricated parts, which comprises the following components in parts by weight
The high-efficiency water reducing agent is prepared by copolymerization reaction of acrylic acid, unsaturated polyoxyethylene ether and maleic anhydride modified cellulose as comonomers in the presence of an initiator, a chain transfer agent and a reducing agent; wherein the mass ratio of the acrylic acid, the unsaturated polyoxyethylene ether, the maleic anhydride modified cellulose, the initiator, the chain transfer agent and the reducing agent is 1 (0.3-0.4): (0.3-0.6): (0.002-0.015): (0.001-0.006): 0.001-0.005).
Preferably, the preparation method of the high efficiency water reducing agent comprises the following steps:
(1) adding a proper amount of cellulose into a mixed solution system of sodium hydroxide and urea, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 3 to 6 hours under the stirring condition, unfreezing the mixed solution at the room temperature, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 3 to 6 hours, and circulating the process for 2 to 3 times to obtain a cellulose solution;
(2) adding a proper amount of maleic anhydride and a catalyst into the cellulose solution obtained in the step (1), reacting for 4-6h at 50-70 ℃, and washing and drying a product after the reaction is finished to obtain maleic anhydride modified cellulose;
(3) taking materials according to the mass ratio, and dissolving an initiator, a chain transfer agent and a reducing agent in water to serve as first drop of liquid; dissolving acrylic acid in water to prepare second dropping liquid with the mass concentration of 45-60%;
(4) adding unsaturated polyoxyethylene ether, maleic anhydride modified cellulose and deionized water into a reaction kettle according to the mass ratio to prepare a mixed solution with the mass concentration of 6-8.5%, stirring and heating to 50-65 ℃, after the materials are dissolved, simultaneously dropwise adding a first dropwise added liquid and a second dropwise added liquid into the reaction kettle, and reacting for 4-5.5 hours at 80-100 ℃ after dropwise adding;
(5) and after the reaction is finished, adjusting the pH value of the material to 7-8 to obtain the high-efficiency water reducing agent.
Preferably, the crushed stones comprise 35% of small crushed stones and 65% of large crushed stones in percentage by mass.
Preferably, the waterproof and anti-permeability agent is prepared by mixing the following components in a mass ratio of 1: (0.005-0.02) limestone and nano-CaCO 3.
The initiator is at least one of ammonium persulfate or potassium persulfate.
Preferably, the chain transfer agent is at least one of dodecyl mercaptan or thioglycolic acid.
Preferably, the catalyst is pyridine.
A preparation method of concrete for prefabricated parts comprises the following steps:
s1: stirring and drying the sand and the broken stones in corresponding parts by weight at the temperature of 70-110 ℃ for 20-30min to obtain a first mixture;
s2: adding the cement and the slag powder into the first mixture, and stirring and mixing for 20-30min to obtain a second mixture;
s3: adding water, a high-efficiency water reducing agent and a waterproof anti-permeability agent in corresponding mass parts into a stirring barrel, and stirring at 600-800rpm for 5-10min to obtain a mixed solution;
s4: and (4) adding the mixed solution obtained in the step S3 into the second mixed material for multiple times, and stirring at 800-1000rpm for 20-30min to obtain the concrete for the prefabricated part. :
the invention has the following beneficial effects:
the invention introduces the high-efficiency water reducing agent into concrete, wherein the high-efficiency water reducing agent is prepared by copolymerization of acrylic acid, unsaturated polyoxyethylene ether and maleic anhydride modified cellulose serving as comonomers, vinyl groups are introduced to a cellulose chain by maleic acylation of the maleic anhydride modified cellulose, so that the cellulose chain and the unsaturated polyoxyethylene ether can be subjected to copolymerization, carboxyl groups generated after ring opening of the cellulose and the maleic anhydride are introduced to a main chain of the high-efficiency water reducing agent, the density of the carboxyl groups of the high-efficiency water reducing agent is increased, and the carboxyl groups with negative charges can be reacted with positive ions (Ca) in cement2+) The electrostatic interaction is generated between the two groups, and the electrostatic interaction can anchor the groups on the cement surface to form electric double layer distribution; thus, by the generated electrostatic repulsion force, water molecules among cement particles and wrapped in the space net structure are released, so that the water reducing effect is improved, the water-cement ratio is reduced, the porosity is reduced, and the pore diameter is refinedThe shrinkage of a hardened body is reduced, the carboxyl is adsorbed on cement particles to play an anchoring role, and the hydrophilic polyether and the hydrophilic hydroxyl chain segment can be stretched in an aqueous solution, so that a hydrophilic three-dimensional adsorption layer with a certain thickness is formed on the surface of the adsorbed cement particles, and the slump of the concrete is kept well.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.
First, make up
Secondly, the preparation process comprises the following steps:
example 1
A preparation method of concrete for prefabricated parts comprises the following steps:
s1: stirring and drying the sand and the broken stones with corresponding mass parts at 100 ℃ for 20min to obtain a first mixture;
s2: adding the cement and the slag powder into the first mixture, and stirring and mixing for 25min to obtain a second mixture;
s3: adding water, a high-efficiency water reducing agent and a waterproof anti-permeability agent in corresponding mass parts into a stirring barrel, and stirring at 600-800rpm for 10min to obtain a mixed solution;
s4: and (4) adding the mixed solution obtained in the step S3 into the second mixed material for multiple times, and stirring at 800-1000rpm for 30min to obtain the concrete for the prefabricated part.
The preparation method of the high-efficiency water reducing agent comprises the following steps:
(1) adding a proper amount of cellulose into a mixed solution system of sodium hydroxide and urea, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 3.5 hours under the condition of stirring, unfreezing the mixed solution at room temperature, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 3.5 hours, and circulating the process for 2 times to obtain a cellulose solution;
(2) adding a proper amount of maleic anhydride and catalyst pyridine into the cellulose solution obtained in the step (1), reacting for 5 hours at 65 ℃, and washing and drying a product after the reaction is finished to obtain maleic anhydride modified cellulose;
(3) taking materials according to the mass ratio, and dissolving an initiator ammonium persulfate, a chain transfer agent dodecyl mercaptan and a reducing agent in water to serve as a first drop of liquid; dissolving acrylic acid in water to prepare second dropping liquid with the mass concentration of 45%;
(4) adding unsaturated polyoxyethylene ether, maleic anhydride modified cellulose and deionized water into a reaction kettle according to the mass ratio to prepare a mixed solution with the mass concentration of 7.0%, stirring and heating to 55 ℃, after the materials are dissolved, simultaneously dropwise adding a first dropping liquid and a second dropping liquid into the reaction kettle, and reacting for 4 hours at 85 ℃ after dropwise adding is finished;
(5) and after the reaction is finished, adjusting the pH value of the material to 7-8 to obtain the high-efficiency water reducing agent.
Example 2
A preparation method of concrete for prefabricated parts comprises the following steps:
s1: stirring and drying the sand and the broken stones with corresponding mass parts at 100 ℃ for 20min to obtain a first mixture;
s2: adding the cement and the slag powder into the first mixture, and stirring and mixing for 25min to obtain a second mixture;
s3: adding water, a high-efficiency water reducing agent and a waterproof anti-permeability agent in corresponding mass parts into a stirring barrel, and stirring at 600-800rpm for 5min to obtain a mixed solution;
s4: and (4) adding the mixed solution obtained in the step S3 into the second mixed material for multiple times, and stirring at 800-1000rpm for 25min to obtain the concrete for the prefabricated part.
The preparation method of the high-efficiency water reducing agent comprises the following steps:
(1) adding a proper amount of cellulose into a mixed solution system of sodium hydroxide and urea, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 4.5 hours under the condition of stirring, unfreezing the mixed solution at room temperature, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 4.5 hours, and circulating the process for 2 times to obtain a cellulose solution;
(2) adding a proper amount of maleic anhydride and catalyst pyridine into the cellulose solution obtained in the step (1), reacting for 5 hours at 70 ℃, and washing and drying a product after the reaction is finished to obtain maleic anhydride modified cellulose;
(3) taking materials according to the mass ratio, and dissolving an initiator ammonium persulfate, a chain transfer agent dodecyl mercaptan and a reducing agent in water to serve as a first drop of liquid; dissolving acrylic acid in water to prepare second dropping liquid with the mass concentration of 45%;
(4) adding unsaturated polyoxyethylene ether, maleic anhydride modified cellulose and deionized water into a reaction kettle according to the mass ratio to prepare a mixed solution with the mass concentration of 6.5%, stirring and heating to 50 ℃, after the materials are dissolved, simultaneously adding a first dropping liquid and a second dropping liquid into the reaction kettle, and reacting for 4 hours at 80 ℃ after the dropping is finished;
(5) and after the reaction is finished, adjusting the pH value of the material to 7-8 to obtain the high-efficiency water reducing agent.
Example 3
A preparation method of concrete for prefabricated parts comprises the following steps:
s1: stirring and drying the sand and the broken stones with corresponding mass parts at the drying temperature of 110 ℃ for 20min to obtain a first mixture;
s2: adding the cement and the slag powder into the first mixture, and stirring and mixing for 20min to obtain a second mixture;
s3: adding water, a high-efficiency water reducing agent and a waterproof anti-permeability agent in corresponding mass parts into a stirring barrel, and stirring at 600-800rpm for 8min to obtain a mixed solution;
s4: and (4) adding the mixed solution obtained in the step S3 into the second mixed material for multiple times, and stirring at 800-1000rpm for 22min to obtain the concrete for the prefabricated part.
The preparation method of the high-efficiency water reducing agent comprises the following steps:
(1) adding a proper amount of cellulose into a mixed solution system of sodium hydroxide and urea, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 5 hours under the condition of stirring, unfreezing the mixed solution at the room temperature, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 5 hours, and repeating the operation for 3 times to obtain a cellulose solution;
(2) adding a proper amount of maleic anhydride and catalyst pyridine into the cellulose solution obtained in the step (1), reacting for 6 hours at 65 ℃, and washing and drying a product after the reaction is finished to obtain maleic anhydride modified cellulose;
(3) taking materials according to a mass ratio, and dissolving an initiator potassium persulfate, a chain transfer agent thioglycolic acid and a reducing agent in water to serve as a first drop of liquid; dissolving acrylic acid in water to prepare a second dropping liquid with the mass concentration of 60%;
(4) adding unsaturated polyoxyethylene ether, maleic anhydride modified cellulose and deionized water into a reaction kettle according to the mass ratio to prepare a mixed solution with the mass concentration of 6.0%, stirring and heating to 58 ℃, after the materials are dissolved, simultaneously dropwise adding a first dropping liquid and a second dropping liquid into the reaction kettle, and reacting for 5 hours at 83 ℃ after dropwise adding;
(5) and after the reaction is finished, adjusting the pH value of the material to 7-8 to obtain the high-efficiency water reducing agent.
Example 4
A preparation method of concrete for prefabricated parts comprises the following steps:
s1: stirring and drying the sand and the broken stones in corresponding parts by weight at the temperature of 70-110 ℃ for 20-30min to obtain a first mixture;
s2: adding the cement and the slag powder into the first mixture, and stirring and mixing for 26min to obtain a second mixture;
s3: adding water, a high-efficiency water reducing agent and a waterproof anti-permeability agent in corresponding mass parts into a stirring barrel, and stirring at 600-800rpm for 9min to obtain a mixed solution;
s4: and (4) adding the mixed solution obtained in the step S3 into the second mixed material for multiple times, and stirring at 800-1000rpm for 25min to obtain the concrete for the prefabricated part.
The preparation method of the high-efficiency water reducing agent comprises the following steps:
(1) adding a proper amount of cellulose into a mixed solution system of sodium hydroxide and urea, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 5.5 hours under the condition of stirring, unfreezing the mixed solution at the room temperature, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 5.5 hours, and circulating the process for 3 times to obtain a cellulose solution;
(2) adding a proper amount of maleic anhydride and catalyst pyridine into the cellulose solution obtained in the step (1), reacting for 5 hours at 70 ℃, and washing and drying a product after the reaction is finished to obtain maleic anhydride modified cellulose;
(3) taking materials according to a mass ratio, and dissolving an initiator potassium persulfate, a chain transfer agent thioglycolic acid and a reducing agent in water to serve as a first drop of liquid; dissolving acrylic acid in water to prepare a second dropping liquid with the mass concentration of 60%;
(4) adding unsaturated polyoxyethylene ether, maleic anhydride modified cellulose and deionized water into a reaction kettle according to the mass ratio to prepare a mixed solution with the mass concentration of 7.5%, stirring and heating to 50 ℃, after the materials are dissolved, simultaneously adding a first dropping liquid and a second dropping liquid into the reaction kettle, and reacting for 5 hours at 90 ℃ after the dropping is finished;
(5) and after the reaction is finished, adjusting the pH value of the material to 7-8 to obtain the high-efficiency water reducing agent.
The implementation effect is as follows:
concrete test pieces formed by preparing the concrete given in examples 1 to 4 into 100X 515mm are cured at the temperature of 20 +/-2 ℃ and the humidity of more than 90 percent, and the working performance of the concrete and the indexes of the compression resistance and the shrinkage performance of the concrete test pieces are measured and shown in Table 1; the admixture for the comparative example was a commercially available polycarboxylic acid water reducing agent, and the rest was the same as in example 1.
TABLE 1 concrete and concrete test piece Performance test
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The concrete for the prefabricated part is characterized by comprising the following components in parts by weight
The high-efficiency water reducing agent is prepared by copolymerization reaction of acrylic acid, unsaturated polyoxyethylene ether and maleic anhydride modified cellulose as comonomers in the presence of an initiator, a chain transfer agent and a reducing agent; wherein the mass ratio of the acrylic acid, the unsaturated polyoxyethylene ether, the maleic anhydride modified cellulose, the initiator, the chain transfer agent and the reducing agent is 1 (0.3-0.4): (0.3-0.6): (0.002-0.015): (0.001-0.006): 0.001-0.005).
2. The concrete for the prefabricated parts as claimed in claim 1, wherein the preparation method of the high efficiency water reducing agent comprises the following steps:
(1) adding a proper amount of cellulose into a mixed solution system of sodium hydroxide and urea, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 3 to 6 hours under the stirring condition, unfreezing the mixed solution at the room temperature, placing the mixed solution system at the temperature of minus 10 to minus 18 ℃ for 3 to 6 hours, and circulating the process for 2 to 3 times to obtain a cellulose solution;
(2) adding a proper amount of maleic anhydride and a catalyst into the cellulose solution obtained in the step (1), reacting for 4-6h at 50-70 ℃, and washing and drying a product after the reaction is finished to obtain maleic anhydride modified cellulose;
(3) taking materials according to the mass ratio, and dissolving an initiator, a chain transfer agent and a reducing agent in water to serve as first drop of liquid; dissolving acrylic acid in water to prepare second dropping liquid with the mass concentration of 45-60%;
(4) adding unsaturated polyoxyethylene ether, maleic anhydride modified cellulose and deionized water into a reaction kettle according to the mass ratio to prepare a mixed solution with the mass concentration of 6-8.5%, stirring and heating to 50-65 ℃, after the materials are dissolved, simultaneously dropwise adding a first dropwise added liquid and a second dropwise added liquid into the reaction kettle, and reacting for 4-5.5 hours at 80-100 ℃ after dropwise adding;
(5) and after the reaction is finished, adjusting the pH value of the material to 7-8 to obtain the high-efficiency water reducing agent.
3. The concrete for precast members according to claim 1, wherein the crushed stone comprises 35% of small crushed stone and 65% of large crushed stone by mass fraction.
4. The concrete for prefabricated parts according to claim 1, wherein the waterproof and anti-permeability agent is a mixture of a waterproof and anti-permeability agent and a water-soluble agent, wherein the waterproof and anti-permeability agent is a mixture of the waterproof and anti-permeability agent and the water-soluble agent in a mass ratio of 1: (0.005-0.02) limestone and nano CaCO mixed3。
5. A precast concrete according to claim 1 or 2, wherein the initiator is at least one of ammonium persulfate or potassium persulfate.
6. The concrete for precast elements according to claim 1 or 2, wherein the chain transfer agent is at least one of dodecyl mercaptan or thioglycolic acid.
7. The precast concrete according to claim 2, wherein the catalyst is pyridine.
8. The method for preparing a concrete for precast members according to claim 1 or 2, comprising the steps of:
s1: stirring and drying the sand and the broken stones in corresponding parts by weight at the temperature of 70-110 ℃ for 20-30min to obtain a first mixture;
s2: adding the cement and the slag powder into the first mixture, and stirring and mixing for 20-30min to obtain a second mixture;
s3: adding water, a high-efficiency water reducing agent and a waterproof anti-permeability agent in corresponding mass parts into a stirring barrel, and stirring at 600-800rpm for 5-10min to obtain a mixed solution;
s4: and (4) adding the mixed solution obtained in the step (3) into the second mixture for multiple times, and stirring at 800-1000rpm for 20-30min to obtain the concrete for the prefabricated part.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113999349A (en) * | 2021-12-07 | 2022-02-01 | 科之杰新材料集团(海南)有限公司 | Peaceful water reducing agent and preparation method thereof |
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| CN108751774A (en) * | 2018-04-24 | 2018-11-06 | 安徽海螺建材设计研究院有限责任公司 | A kind of preparation method of concrete prefabricated element polycarboxylate water-reducer |
| CN110240450A (en) * | 2019-07-05 | 2019-09-17 | 云南建投绿色高性能混凝土股份有限公司 | A kind of high cracking resistance lower shrinkage high performance concrete suitable for high temperature River Valley Region |
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