CN111205013A - High-strength high-performance concrete polycarboxylate superplasticizer and preparation method thereof - Google Patents
High-strength high-performance concrete polycarboxylate superplasticizer and preparation method thereof Download PDFInfo
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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
- C04B40/0039—Premixtures of ingredients
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- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
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- 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
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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
- 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
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- Materials Engineering (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-strength high-performance concrete polycarboxylate superplasticizer and a preparation method thereof, wherein the concrete polycarboxylate superplasticizer comprises the following raw materials in percentage by weight: 60-70% of viscosity-reducing polycarboxylic acid water-reducing mother liquor, 15-20% of slump retaining agent, 0.03-0.05% of defoaming agent, 2-6% of special retarder, 0.1-0.3% of viscosity regulator and 4-23% of water; the viscosity-reducing polycarboxylic acid water-reducing mother liquor is prepared by polymerizing unsaturated polyether, acrylic acid, a special monomer, a chain transfer agent and an initiator; the slump retaining agent is prepared by polymerizing unsaturated polyether, acrylic acid, acrylate, a molecular weight regulator, a chain transfer agent and an initiator.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to a high-strength high-performance concrete polycarboxylate superplasticizer and a preparation method thereof.
Background
Concrete is the largest volume of structural material used in today's construction field. Along with the development of large-scale real estate development and urban infrastructure buildings in China, high-rise and super high-rise buildings are continuously emerging, large bridges, high-speed railways and nuclear power engineering are in endless, and higher requirements are put forward for the performance and construction technology of concrete materials. The preparation of the high-strength and high-performance concrete can greatly facilitate engineering construction, save construction cost and improve engineering quality. Compared with common concrete, the high-strength and ultrahigh-strength high-performance concrete with extremely low water-cement ratio has the advantages of higher strength, smaller structural size, higher elastic modulus, higher rigidity, better stability and the like. Meanwhile, because high-rise or super high-rise buildings generally have complex structures and dense reinforcing steel bars, the concrete strength is required to be higher, and meanwhile, higher requirements are provided for the fluidity of the concrete, and the concrete must have the performances of large flow state, self-compaction, high working performance, no vibration, good cohesiveness, good segregation resistance and the like.
The polycarboxylate superplasticizer as a third-generation high-performance water reducer has the characteristics of low mixing amount, high water reducing rate, small slump loss, small air entraining amount, no bleeding and no segregation, and is particularly suitable for preparing high-strength and large-flow-state high-performance concrete.
It is generally believed that: the concrete agent with the strength not lower than C50 is high-strength concrete. However, in JGJ/T281-2012, technical Specification for high-strength concrete application, it is specified that concrete with strength not lower than C60 is high-strength concrete. Besides the requirement of high-strength concrete must meet the specification, the working performance also meets the following requirements: the slump is more than or equal to 220mm, the expansion degree is more than or equal to 500mm, the slump loss is less than or equal to 10 mm/h with the lapse of time, the separation and the bleeding are avoided, and the setting time meets the construction requirement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the high-strength high-performance concrete polycarboxylate superplasticizer which has the advantages of high water reducing rate, small slump loss, small air entraining amount, no bleeding and no segregation.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a high-strength high-performance concrete polycarboxylate superplasticizer comprises the following raw materials in percentage by weight: 60-70% of viscosity-reducing polycarboxylic acid water-reducing mother liquor, 15-20% of slump retaining agent, 0.03-0.05% of defoaming agent, 2-6% of special retarder, 0.1-0.3% of viscosity regulator and 4-23% of water;
the viscosity-reducing polycarboxylic acid water-reducing mother liquor is prepared by polymerizing unsaturated polyether, acrylic acid, a special monomer, a chain transfer agent and an initiator;
the slump retaining agent is prepared by polymerizing unsaturated polyether, acrylic acid, acrylate, a molecular weight regulator, a chain transfer agent and an initiator.
Preferably, the defoaming agent is one or more of a silicone defoaming agent and a polyether defoaming agent.
Preferably, the special retarder is one or more of organic phosphoric acid (salt), sodium gluconate, sucrose and polyphosphate.
Preferably, the viscosity regulator is one or more of hydroxymethyl cellulose, starch ether, xanthan gum, welan gum and sodium alginate.
Preferably, the viscosity-reducing polycarboxylic acid water-reducing mother liquor comprises the following components in percentage by mass: 85-90% of unsaturated polyether, 7-12% of acrylic acid, 2-3% of special monomer, 0.01-0.02% of chain transfer agent and 0.2-0.3% of initiator.
Preferably, the slump retaining agent comprises the following components in percentage by mass: 80-85% of unsaturated polyether, 5-10% of acrylic acid, 4-10% of acrylate, 0.01-0.02% of molecular weight regulator, 0.01-0.02% of chain transfer agent and 0.1-0.3% of initiator.
The invention also discloses a preparation method of the high-strength high-performance concrete polycarboxylate superplasticizer, which comprises the following steps:
preparing a viscosity-reducing polycarboxylic acid water-reducing mother liquor: firstly, adding unsaturated polyether and a special monomer into a reaction kettle at a certain temperature, uniformly stirring, then adding a chain transfer agent and an initiator into the reaction kettle, uniformly stirring, finally dropwise adding acrylic acid into the reaction kettle, and reacting at constant temperature for a certain time after the dropwise adding of the acrylic acid is finished to obtain a viscosity-reducing polycarboxylic acid water-reducing mother liquor;
preparation of slump retaining agent: firstly, adding unsaturated polyether and acrylic ester into a reaction kettle at a certain temperature, uniformly stirring, then adding a chain transfer agent and an initiator into the reaction kettle, uniformly stirring, finally dropwise adding acrylic acid into the reaction kettle, reacting at constant temperature for a certain time after the dropwise adding of the acrylic acid is finished, and adding a molecular weight regulator into the constant-temperature reaction process to finally obtain a slump retaining agent;
weighing water, injecting the water into a reaction kettle, simultaneously adding the viscosity reduction type polycarboxylic acid water reducing mother liquor, the slump retaining agent, the defoaming agent and the special retarder into the reaction kettle, and uniformly stirring to obtain a finished product.
Preferably, the temperature of the constant-temperature reaction is 45-70 ℃ in the preparation process of the viscosity-reducing polycarboxylic acid water-reducing mother liquor.
Preferably, in the preparation of the slump retaining agent, the temperature of the isothermal reaction is 45-70 ℃.
The invention has the beneficial effects that: the polycarboxylic acid water reducing agent for the high-strength and high-performance concrete can endow the concrete with excellent performances of high strength (C60-C80), large fluidity, self-compaction, pump loss resistance and the like. The high-strength concrete prepared by the method does not need to use a silica fume admixture, has high cost performance, and is economical and applicable.
Detailed Description
The claimed solution will now be described in further detail with reference to specific embodiments.
Example one
The high-strength high-performance concrete polycarboxylate superplasticizer in the embodiment comprises the following raw materials in percentage by weight: 60% of viscosity-reducing polycarboxylic acid water-reducing mother liquor, 15% of slump retaining agent, 0.03% of defoaming agent, 2% of special retarder, 0.1% of viscosity regulator and 22.87% of water.
The viscosity-reducing polycarboxylic acid water-reducing mother liquor is prepared by polymerizing unsaturated polyether, acrylic acid, a special monomer, a chain transfer agent and an initiator, wherein the mass percentages of the components in the viscosity-reducing polycarboxylic acid water-reducing mother liquor are as follows: 85% of unsaturated polyether, 11.99% of acrylic acid, 3% of special monomer, 0.01% of chain transfer agent and 0.25% of initiator.
The preparation process of the viscosity-reducing polycarboxylic acid water-reducing mother liquor comprises the following steps: firstly, adding unsaturated polyether and a special monomer into a reaction kettle at the temperature of about 45-70 ℃, uniformly stirring, then adding a chain transfer agent and an initiator into the reaction kettle, uniformly stirring, finally dropwise adding acrylic acid into the reaction kettle, and reacting at the constant temperature of 45-70 ℃ for a certain time after the dropwise adding of the acrylic acid is finished to obtain the viscosity-reducing polycarboxylic acid water-reducing mother liquor.
The slump retaining agent is prepared by polymerizing unsaturated polyether, acrylic acid, acrylates, a molecular weight regulator, a chain transfer agent and an initiator, wherein the slump retaining agent comprises the following components in percentage by mass: 80% of unsaturated polyether, 10% of acrylic acid, 9.98% of acrylates, 0.01% of molecular weight regulator, 0.01% of chain transfer agent and 0.2% of initiator.
The configuration process of the slump retaining agent is as follows: firstly, adding unsaturated polyether and acrylic ester into a reaction kettle at a certain temperature, uniformly stirring, then adding a chain transfer agent and an initiator into the reaction kettle, uniformly stirring, finally dropwise adding acrylic acid into the reaction kettle, reacting at a constant temperature of 45-70 ℃ for a certain time after the dropwise adding of the acrylic acid is finished, and adding a molecular weight regulator into the constant temperature reaction process to finally obtain the slump retaining agent.
In this embodiment, the special retarder is one or more of organic phosphoric acid (salt), sodium gluconate, sucrose, and polyphosphate.
In this embodiment, the defoaming agent is one or more of a silicone defoaming agent and a polyether defoaming agent.
In this embodiment, the viscosity regulator is one or more of hydroxymethyl cellulose, starch ether, xanthan gum, welan gum and sodium alginate.
When the high-strength high-performance concrete polycarboxylate superplasticizer is prepared, water is weighed and injected into a reaction kettle, and meanwhile, a viscosity-reducing polycarboxylate water-reducing mother liquor, a slump retaining agent, a defoaming agent and a special retarder are added into the reaction kettle and uniformly stirred to obtain a finished product.
Example two
The high-strength high-performance concrete polycarboxylate superplasticizer in the embodiment comprises the following raw materials in percentage by weight: 70 percent of viscosity-reducing polycarboxylic acid water-reducing mother liquor, 20 percent of slump retaining agent, 0.05 percent of defoaming agent, 5 percent of special retarder, 0.3 percent of viscosity regulator and 4.65 percent of water.
The viscosity-reducing polycarboxylic acid water-reducing mother liquor is prepared by carrying out redox polymerization on unsaturated polyether, acrylic acid, a special monomer and a chain transfer agent, wherein the mass percentages of the components in the viscosity-reducing polycarboxylic acid water-reducing mother liquor are as follows: 90% of unsaturated polyether, 7.98% of acrylic acid, 2% of special monomer, 0.02% of chain transfer agent and 0.25% of initiator.
The preparation process of the viscosity-reducing polycarboxylic acid water-reducing mother liquor comprises the following steps: firstly, adding unsaturated polyether and a special monomer into a reaction kettle at the temperature of about 45-70 ℃, uniformly stirring, then adding a chain transfer agent into the reaction kettle, uniformly stirring, finally dropwise adding acrylic acid into the reaction kettle, and reacting at the constant temperature of 45-70 ℃ for a certain time after the dropwise adding of the acrylic acid is finished to obtain the viscosity-reducing polycarboxylic acid water-reducing mother liquor.
The slump retaining agent is prepared by carrying out redox polymerization on unsaturated polyether, acrylic acid, acrylate, a molecular weight regulator and a chain transfer agent. Wherein the slump retaining agent comprises the following components in percentage by mass: 85% of unsaturated polyether, 5% of acrylic acid, 9.96% of acrylate, 0.02% of molecular weight regulator, 0.02% of chain transfer agent and 0.2% of initiator.
The configuration process of the slump retaining agent is as follows: firstly, adding unsaturated polyether and acrylic ester into a reaction kettle at a certain temperature and uniformly stirring, then adding a chain transfer agent into the reaction kettle and uniformly stirring, finally dropwise adding acrylic acid into the reaction kettle, reacting at a constant temperature of 45-70 ℃ for a certain time after the dropwise adding of the acrylic acid is finished, and adding a molecular weight regulator into the constant temperature reaction process to finally obtain the slump retaining agent.
In this embodiment, the special retarder is one or more of sucrose and polyphosphate.
In this embodiment, the defoaming agent is one or more of polyether defoaming agents.
In this embodiment, the viscosity regulator is one or more of xanthan gum, welan gum and sodium alginate.
When the high-strength high-performance concrete polycarboxylate superplasticizer is prepared, water is weighed and injected into a reaction kettle, and meanwhile, a viscosity-reducing polycarboxylate water-reducing mother liquor, a slump retaining agent, a defoaming agent and a special retarder are added into the reaction kettle and uniformly stirred to obtain a finished product.
EXAMPLE III
The high-strength high-performance concrete polycarboxylate superplasticizer in the embodiment comprises the following raw materials in percentage by weight: 65% of viscosity-reducing polycarboxylic acid water-reducing mother liquor, 17% of slump retaining agent, 0.03% of defoaming agent, 6% of special retarder, 0.3% of viscosity regulator and 11.67% of water.
The viscosity-reducing polycarboxylic acid water-reducing mother liquor is prepared by carrying out redox polymerization on unsaturated polyether, acrylic acid, a special monomer and a chain transfer agent, wherein the mass percentages of the components in the viscosity-reducing polycarboxylic acid water-reducing mother liquor are as follows: 85.98% of unsaturated polyether, 12% of acrylic acid, 2% of special monomer, 0.02% of chain transfer agent and 0.2% of initiator.
The preparation process of the viscosity-reducing polycarboxylic acid water-reducing mother liquor comprises the following steps: firstly, adding unsaturated polyether and a special monomer into a reaction kettle at the temperature of about 45-70 ℃, uniformly stirring, then adding a chain transfer agent into the reaction kettle, uniformly stirring, finally dropwise adding acrylic acid into the reaction kettle, and reacting at the constant temperature of 45-70 ℃ for a certain time after the dropwise adding of the acrylic acid is finished to obtain the viscosity-reducing polycarboxylic acid water-reducing mother liquor.
The slump retaining agent is prepared by carrying out redox polymerization on unsaturated polyether, acrylic acid, acrylate, a molecular weight regulator and a chain transfer agent. Wherein the slump retaining agent comprises the following components in percentage by mass: 82.96% of unsaturated polyether, 7% of acrylic acid, 10% of acrylate, 0.02% of molecular weight regulator, 0.02% of chain transfer agent and 0.2% of initiator.
The configuration process of the slump retaining agent is as follows: firstly, adding unsaturated polyether and acrylic ester into a reaction kettle at a certain temperature and uniformly stirring, then adding a chain transfer agent into the reaction kettle and uniformly stirring, finally dropwise adding acrylic acid into the reaction kettle, reacting at a constant temperature of 45-70 ℃ for a certain time after the dropwise adding of the acrylic acid is finished, and adding a molecular weight regulator into the constant temperature reaction process to finally obtain the slump retaining agent.
In this embodiment, the special retarder is one or more of organic phosphoric acid (salt), sodium gluconate, sucrose, and polyphosphate.
In this embodiment, the defoaming agent is one or more of a silicone defoaming agent and a polyether defoaming agent.
In this embodiment, the viscosity regulator is one or more of hydroxymethyl cellulose, starch ether, xanthan gum, welan gum and sodium alginate.
When the high-strength high-performance concrete polycarboxylate superplasticizer is prepared, water is weighed and injected into a reaction kettle, and meanwhile, a viscosity-reducing polycarboxylate water-reducing mother liquor, a slump retaining agent, a defoaming agent and a special retarder are added into the reaction kettle and uniformly stirred to obtain a finished product.
The polycarboxylate water reducers obtained in the above examples are tested, and specifically, the polycarboxylate water reducers in the above examples are mixed into concrete with various strength grades in an amount of 2.2%, and the concrete with various strength grades is tested to obtain test results.
The concrete raw materials used in the tests were as follows:
| cement | Jinying P.O 42.5 cement |
| Mineral powder | S95 mineral powder with specific surface area of 4180cm2 per g, density of 2.85g per cm3, activity of 86% in 7 days and 98% in 28 days |
| Fly ash | Class I fly ash with fineness of 9.5%, loss on ignition of 2.6% and water demand of 93% |
| Sand | Natural river sand with fineness modulus of 2.8 and mud content of 0.8% |
| Crushing stone | 5-20mm continuous gradation, apparent density 2750 kg/m 3, needle sheet content of 3.8%, crushing index of 6.8%, 0-5mm melon-rice stone, mud content of 0.3% |
The concrete with various strength grades comprises the following raw materials in proportion:
| strength grade | Cement | Mineral powder | Fly ash | Sand | Stone (0-5) | Stone (1-2) | Water (W) |
| C60 | 270 | 90 | 100 | 830 | 130 | 850 | 128 |
| C70 | 330 | 100 | 100 | 790 | 100 | 910 | 130 |
| C80 | 380 | 100 | 90 | 700 | 100 | 900 | 133 |
Concrete workability and strength results:
the above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes and modifications to the disclosed embodiments, or modify equivalent embodiments to practice the disclosed embodiments, without departing from the scope of the disclosed embodiments. Therefore, equivalent variations made according to the idea of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical solution of the present invention.
Claims (9)
1. The high-strength high-performance concrete polycarboxylate superplasticizer is characterized by comprising the following raw materials in percentage by weight: 60-70% of viscosity-reducing polycarboxylic acid water-reducing mother liquor, 15-20% of slump retaining agent, 0.03-0.05% of defoaming agent, 2-6% of special retarder, 0.1-0.3% of viscosity regulator and 4-23% of water;
the viscosity-reducing polycarboxylic acid water-reducing mother liquor is prepared by polymerizing unsaturated polyether, acrylic acid, a special monomer, a chain transfer agent and an initiator;
the slump retaining agent is prepared by polymerizing unsaturated polyether, acrylic acid, acrylate, a molecular weight regulator, a chain transfer agent and an initiator.
2. The high-strength high-performance concrete polycarboxylate superplasticizer according to claim 1, characterized in that: the defoaming agent is one or more of an organic silicon defoaming agent and a polyether defoaming agent.
3. The high-strength high-performance concrete polycarboxylate superplasticizer according to claim 1, characterized in that: the special retarder is one or more of organic phosphoric acid (salt), sodium gluconate, sucrose and polyphosphate.
4. The high-strength high-performance concrete polycarboxylate superplasticizer according to claim 1, characterized in that: the viscosity regulator is one or more of hydroxymethyl cellulose, starch ether, xanthan gum, welan gum and sodium alginate.
5. The high-strength high-performance concrete polycarboxylate superplasticizer according to claim 1, characterized in that: the viscosity-reducing polycarboxylic acid water-reducing mother liquor comprises the following components in percentage by mass: 85-90% of unsaturated polyether, 7-12% of acrylic acid, 2-3% of special monomer, 0.01-0.02% of chain transfer agent and 0.2-0.3% of initiator.
6. The high-strength high-performance concrete polycarboxylate superplasticizer according to claim 1, characterized in that: the slump retaining agent comprises the following components in percentage by mass: 80-85% of unsaturated polyether, 5-10% of acrylic acid, 4-10% of acrylate, 0.01-0.02% of molecular weight regulator, 0.01-0.02% of chain transfer agent and 0.1-0.3% of initiator.
7. The preparation method of the high-strength high-performance concrete polycarboxylate superplasticizer according to claim 1, characterized by comprising the following steps:
preparing a viscosity-reducing polycarboxylic acid water-reducing mother liquor: firstly, adding unsaturated polyether and a special monomer into a reaction kettle at a certain temperature, uniformly stirring, then adding a chain transfer agent and an initiator into the reaction kettle, uniformly stirring, finally dropwise adding acrylic acid into the reaction kettle, and reacting at constant temperature for a certain time after the dropwise adding of the acrylic acid is finished to obtain a viscosity-reducing polycarboxylic acid water-reducing mother liquor;
preparation of slump retaining agent: firstly, adding unsaturated polyether and acrylic ester into a reaction kettle at a certain temperature, uniformly stirring, then adding a chain transfer agent and an initiator into the reaction kettle, uniformly stirring, finally dropwise adding acrylic acid into the reaction kettle, reacting at constant temperature for a certain time after the dropwise adding of the acrylic acid is finished, and adding a molecular weight regulator into the constant-temperature reaction process to finally obtain a slump retaining agent;
weighing water, injecting the water into a reaction kettle, simultaneously adding the viscosity reduction type polycarboxylic acid water reducing mother liquor, the slump retaining agent, the defoaming agent and the special retarder into the reaction kettle, and uniformly stirring to obtain a finished product.
8. The preparation method of the high-strength high-performance concrete polycarboxylate superplasticizer according to claim 7, which is characterized by comprising the following steps: in the preparation process of the viscosity-reducing polycarboxylic acid water-reducing mother liquor, the temperature of the constant-temperature reaction is 45-70 ℃.
9. The preparation method of the high-strength high-performance concrete polycarboxylate superplasticizer according to claim 7, which is characterized by comprising the following steps: in the preparation of the slump retaining agent, the constant temperature reaction temperature is 45-70 ℃.
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Application publication date: 20200529 |