CN116355141B - Concrete modulator, preparation method thereof, concrete additive and concrete composition - Google Patents
Concrete modulator, preparation method thereof, concrete additive and concrete composition Download PDFInfo
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- CN116355141B CN116355141B CN202310322009.3A CN202310322009A CN116355141B CN 116355141 B CN116355141 B CN 116355141B CN 202310322009 A CN202310322009 A CN 202310322009A CN 116355141 B CN116355141 B CN 116355141B
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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
- 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
- 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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- 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
Abstract
The invention provides a concrete modulator and a preparation method thereof, a concrete additive and a concrete composition, wherein the preparation raw materials of the concrete modulator comprise the following components in parts by weight: 5-8 parts of polyether macromonomer, 3-8 parts of acrylic acid, 70-80 parts of acrylamide, 3-8 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-8 parts of unsaturated phosphate, 5-10 parts of organic matters with two carbon-carbon double bonds, 0.02-0.04 part of initiator and 600-1000 parts of deionized water. The concrete modifier has good water retention effect, can effectively control the slump loss of concrete with time, can improve the working performance of concrete, and reduces the problems of segregation and bleeding of concrete.
Description
Technical Field
The invention relates to the field of concrete building materials, in particular to a concrete modulator and a preparation method thereof, and simultaneously relates to a concrete additive and a concrete composition comprising the concrete modulator.
Background
Along with mass construction of economic highways, railways, hydropower stations, civil constructions and other projects, the requirements of high-performance concrete on performance are higher and higher. However, in the practical application process, due to the factors of unstable cement components, poor adaptability of the admixture and cement, low powder content of coarse and fine aggregates such as sand, stone and the like, poor cohesiveness of concrete, easy segregation, bleeding, bottom scraping and the like. Bleeding can cause a decrease in the surface strength of the concrete. The water leaves bleeding channels during the flotation. These voids can reduce the compactness of the concrete, make chloride ions, sulfate, carbon dioxide, etc. more easily enter the interior of the concrete, and seriously reduce the durability of the concrete. In addition, the water pocket formed by bleeding under concrete also reduces the strength of the interface area between aggregate and set cement. In self-compacting concrete, the bleeding water also can cause incomplete filling of the self-compacting concrete, resulting in reduced structural strength. In pumping concrete, bleeding can lead to the concrete to grab the bottom and block up the pipe, thereby reducing production efficiency and increasing the labor intensity of manpower.
In order to reduce bleeding, the concrete is often mixed with a modifier, which is also called a stabilizer, a viscosity regulator and a water-retaining agent, and is a novel concrete additive which is originally applied to underwater non-dispersed concrete and self-compacting concrete abroad. The concrete slurry can increase the cohesiveness and water retention property of concrete, reduce the occurrence of slurry bone separation, improve the uniformity of concrete slurry and improve the working performance of concrete. The modifier is usually compounded with a polycarboxylate water reducer, and is mainly applied to high-flow mortar, high-flow concrete, self-compacting concrete, underwater non-dispersing concrete and sprayed concrete at present. The method is used for improving the workability of the concrete and solving the contradiction between the deformation capability and segregation resistance of the new mortar with high fluidity and high expansion degree and the concrete.
The inventors have retrieved the following related patent documents: CN110003375B discloses a salt-resistant concrete water-retaining agent and a preparation method thereof, wherein the water-retaining agent is prepared from the following raw materials: 10-20 parts of acrylic acid substances, 2-10 parts of 2-acrylamide-2-methylpropanesulfonic acid, 2-10 parts of one of sodium alkyl sulfonate and sodium alkyl benzene sulfonate, 0.2-2 parts of hydrophobic monomers, 0.05-0.15 part of initiator and 600-830 parts of deionized water. The preparation method comprises the steps of adding acrylic substances and 2-acrylamide-2-methylpropanesulfonic acid into a reaction kettle, dissolving with deionized water, neutralizing to be neutral with sodium hydroxide, adding one of sodium alkyl sulfonate and sodium alkyl benzene sulfonate and a hydrophobic monomer, and completely dissolving; stirring and heating to 40-50 ℃, adding an initiator, and reacting for 7-8 hours; adding the rest deionized water to obtain viscous liquid, namely the water-retaining agent.
CN113087844a discloses a polycarboxylic acid water-retaining agent for wet-mixed mortar and concrete and a preparation method thereof, wherein the preparation raw materials comprise sodium propenyl sulfonate, acrylamide, hydrogen peroxide, acrylic acid, mercaptopropionic acid, VC and deionized water, wherein the proportion of sodium propenyl sulfonate is set to 5-10 parts, the proportion of acrylamide is set to 5-10 parts, and the proportion of hydrogen peroxide is set to 0.3-0.5 part.
The technology does not give a specific guiding scheme for how the water-retaining agent has good cement adsorptivity, improves the segregation and bleeding resistance of concrete and reduces the sensitivity of the modulator, and the water-retaining agent prepared according to the method has no obvious effect.
Disclosure of Invention
The concrete modifier provided by the invention has a good water retention effect, can effectively control the slump loss of concrete with time, can improve the working performance of concrete, and can reduce the problems of segregation and bleeding of concrete.
The preparation raw materials of the concrete modulator comprise the following components in parts by weight: 5-8 parts of polyether macromonomer, 3-8 parts of acrylic acid, 70-80 parts of acrylamide, 3-8 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-8 parts of unsaturated phosphate, 5-10 parts of organic matters with two carbon-carbon double bonds, 0.02-0.04 part of initiator and 600-1000 parts of deionized water.
The preparation raw materials of the concrete modulator can enable the polymerized molecular chains to form a network structure by adding the organic matters with two carbon-carbon double bonds, so that free water is easier to absorb, and the bleeding rate of concrete is reduced. The carboxylic acid group, the sulfonic acid group and the amino group introduced in the preparation raw materials have adsorption effect, so that the viscosity of aggregate and slurry can be improved, the stability of fresh concrete is improved, and the yield stress resistance and segregation resistance of the concrete are improved. The introduced phosphate can release phosphate groups, has stronger complexing capacity with calcium ions, and can reduce the bleeding phenomenon in the later stage of concrete.
Further, the unsaturated phosphate comprises at least one of acrylic acid phosphate, methacrylic acid phosphate and hydroxyethyl methacrylate phosphate.
Further, the polyether macromonomer comprises at least one of isobutylether, isopentylether and six-carbon polyether macromonomer, and the molecular weight of the polyether macromonomer is 2400-5000.
Further, the organic matter with two carbon-carbon double bonds comprises at least one of methyl 1, 3-butadiene, ethyl 2, 3-butadiene, benzyl 2, 3-butadiene, isoprene and 1,3 butadiene.
Further, the initiator is ammonium persulfate or hydrogen peroxide.
The invention also provides a preparation method of the concrete modulator, which is characterized in that: and uniformly mixing and dissolving a polyether macromonomer, acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, unsaturated phosphate, an organic matter with two carbon-carbon double bonds and deionized water, adding an initiator, adding alkali to neutralize to pH=6-8, and uniformly stirring to obtain the concrete modulator.
Further, the reaction temperature is controlled between 50-60 ℃.
The invention also provides a concrete additive, which comprises the concrete modifier.
Further, the concrete admixture further comprises a polycarboxylate water reducer.
The invention also provides a concrete composition, and the preparation raw materials of the concrete composition comprise the concrete modulator.
The concrete composition of the invention has the advantages of good working performance and low bleeding rate by adopting the concrete modulator.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The experimental methods in the following examples are conventional methods unless otherwise specified. The test materials used in the examples described below, unless otherwise specified, were purchased from conventional biochemical reagent stores. In addition, unless specifically described otherwise, each term and process referred to in this embodiment is understood by those skilled in the art in light of the commonly recognized and conventional approaches in the art.
The concrete modulator comprises the following preparation raw materials in parts by weight: 5-8 parts of polyether macromonomer, 3-8 parts of acrylic acid, 70-80 parts of acrylamide, 3-8 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-8 parts of unsaturated phosphate, 5-10 parts of organic matters with two carbon-carbon double bonds, 0.02-0.04 part of ammonium persulfate and 600-1000 parts of deionized water.
The concrete modulator of the invention initiates polyether macromonomer, acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, unsaturated phosphate and organic matters with two carbon-carbon double bonds by adopting an initiator to carry out free radical polymerization, and a polymerized product is a high molecular polymer with a cross-linked network structure, wherein the polymerized product is provided with a polyether long side chain, a carboxylic acid group, an amide group, a sulfonic acid group and a phosphate group. The initiator may be a conventional radical polymerization initiator such as a peroxy-type initiator, and the present invention is preferably initiated using ammonium persulfate.
The organic matters with two carbon-carbon double bonds strengthen intermolecular crosslinking, a molecular network structure is more complex, a polymeric network structure can be provided for a polymerized macromolecular chain, and compared with the long linear structure of a traditional water-retaining agent, the network structure can more effectively and easily absorb free water through actions such as winding, absorption and connection, so that the free water quantity is reduced, and the possibility of concrete bleeding is reduced. The organic substance having two carbon-carbon double bonds may be a binary unsaturated aliphatic compound or a linear diene, and may be at least one of methyl 1, 3-butadiene, ethyl 2, 3-butadiene, benzyl 2, 3-butadiene, isoprene, and 1, 3-butadiene.
The polyether macromonomer is added, so that the polymer has a polyether long side chain, has better compatibility with the polycarboxylate water reducer synthesized by the polyether monomer, and is not layered after being compounded. The polyether macromonomer preferably comprises at least one of isobutylether, isopentylether and hexacarbon polyether macromonomer, and further preferably has a molecular weight of 2400-5000,
acrylic acid, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid provide carboxylic acid groups, sulfonic acid groups and amino groups for polymerized products, the groups have adsorption effect and can be effectively adsorbed on cement particles, meanwhile, a polymer molecular network structure is wound and wrapped with mixing water to lock water, so that the water is fully contacted with the cement particles, the viscosity of slurry is improved, the viscosity of the slurry is increased, the cohesive effect between aggregate and slurry is enhanced, the stability and yield stress value of fresh concrete are improved, and the segregation resistance of the concrete is enhanced.
Unsaturated phosphates provide the phosphate groups to the product after polymerization. In general, cement presents alkaline condition, phosphate is hydrolyzed under alkaline condition to release phosphate group, and compared with traditional carboxylic acid group, sulfonic acid group and amino group, the phosphate group has stronger electronegativity and stronger complexing ability with calcium ions, reduces sensitivity of the modulator, and can avoid bleeding phenomenon in later period of concrete. The unsaturated phosphate esters preferred in the present invention may include at least one of acrylic phosphate ester, methacrylic phosphate ester, hydroxyethyl methacrylate phosphate ester.
In conclusion, the preparation raw materials of the concrete modulator can enable the polymerized molecular chains to form a network structure by adding the organic matters with two carbon-carbon double bonds, free water is easier to absorb, the bleeding rate of concrete is reduced, carboxylic acid groups, sulfonic acid groups and amino groups introduced into the preparation raw materials have adsorption effect, the viscosity of aggregate and slurry can be improved, the stability of fresh concrete is improved, the yield stress resistance and segregation resistance of the concrete are improved, and the introduced phosphate can release the phosphoric acid groups, have stronger complexing capacity with calcium ions, and can reduce the bleeding phenomenon in the later stage of the concrete.
The invention also provides a preparation method of the concrete modulator, which comprises the following steps of adding 5-8 parts of polyether macromonomer, 3-8 parts of acrylic acid, 70-80 parts of acrylamide, 3-8 parts of 2-acrylamide-2-methylpropanesulfonic acid, 3-8 parts of unsaturated phosphate, 5-10 parts of organic matters with two carbon-carbon double bonds and 600-1000 parts of deionized water into a reaction kettle, stirring until the organic matters are completely dissolved, adding 0.02-0.04 part of ammonium persulfate, continuing stirring for 1-2 hours, stopping stirring and preserving heat for 10-14 hours, adding liquid alkali for neutralization until pH=6-8, and stirring for 10-30 minutes to obtain the concrete modulator. In order to make the prepared concrete modulator have better performance, the temperature of the preparation process is preferably controlled to be 50-60 ℃.
The invention also provides a concrete additive, which comprises the concrete modifier. It is worth to say that, because the concrete modulator has good compatibility with the polycarboxylate water reducer, and the dosage is insensitive, the concrete modulator is very suitable for being matched with the polycarboxylate water reducer, the working performance of the concrete can be improved, and the problems of concrete segregation and bleeding are solved, so the concrete admixture of the invention can preferably further comprise the polycarboxylate water reducer.
The invention also provides a concrete composition, and the preparation raw materials of the concrete composition comprise the concrete modifier. The concrete composition of the invention has the advantages of good working performance and low bleeding rate by adopting the concrete modulator.
Specific embodiments of the present invention are described in detail below.
Example 1
The concrete modulator of the embodiment is prepared from the following raw materials in parts by weight: 5 parts of isopentenyl alcohol polyoxyethylene ether (molecular weight 2400), 3 parts of acrylic acid, 75 parts of acrylamide, 3 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 parts of acrylic acid phosphate, 5 parts of 1, 3-methyl butadiene, 0.02 part of ammonium persulfate and 864 parts of deionized water.
The preparation method of the concrete modulator specifically comprises the following steps: adding isopentenol polyoxyethylene ether, acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid phosphate, 1, 3-methyl butadiene and deionized water into a reaction kettle, heating to 50 ℃, stirring until the mixture is completely dissolved, adding ammonium persulfate, continuously stirring for 1 hour, stopping stirring, keeping the temperature for 10 hours, adding liquid alkali for neutralization, and stirring for 20 minutes to obtain the concrete modulator.
The concrete modifier of the embodiment is compounded with the polycarboxylate water reducer, and is added into cement concrete for mixing, and slump, expansion degree, bleeding rate ratio and compressive strength are tested.
Example two
The concrete modulator of the embodiment is prepared from the following raw materials in parts by weight: 7 parts of isobutylether (molecular weight 3000), 5 parts of acrylic acid, 75 parts of acrylamide, 5 parts of 2-acrylamide-2-methylpropanesulfonic acid, 6 parts of phosphoric acid methacrylate, 7 parts of 2, 3-ethyl butadiene, 0.03 part of ammonium persulfate and 945 parts of deionized water.
The preparation method of the concrete modulator specifically comprises the following steps: adding the isobutylether, the acrylic acid, the acrylamide, the 2-acrylamide-2-methylpropanesulfonic acid, the methacrylic acid phosphate, the 2, 3-ethyl butadiene and the deionized water into a reaction kettle, heating to 55 ℃, stirring until the mixture is completely dissolved, adding the ammonium persulfate, continuing stirring for 1.5 hours, stopping stirring, preserving heat for 12 hours, adding liquid alkali for neutralization, and stirring for 10 minutes to obtain the concrete modulator.
The concrete modifier of the embodiment is compounded with the polycarboxylate water reducer, and is added into cement concrete for mixing, and slump, expansion degree, bleeding rate ratio and compressive strength are tested.
Example III
The concrete modulator of the embodiment is prepared from the following raw materials in parts by weight: 8 parts of isopentenyl alcohol polyoxyethylene ether (molecular weight 5000), 5 parts of acrylic acid, 75 parts of acrylamide, 8 parts of 2-acrylamide-2-methylpropanesulfonic acid, 8 parts of hydroxyethyl methacrylate phosphate, 10 parts of benzyl 2, 3-butadiene acid ester, 0.04 part of ammonium persulfate and 709 parts of deionized water.
The preparation method of the concrete modulator specifically comprises the following steps: adding isopentenol polyoxyethylene ether, acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, hydroxyethyl methacrylate phosphate, benzyl 2, 3-butadiene acid and deionized water into a reaction kettle, heating to 60 ℃, stirring until the mixture is completely dissolved, adding ammonium persulfate, continuing stirring for 2 hours, stopping stirring, preserving heat for 14 hours, adding liquid alkali for neutralization, and stirring for 30 minutes to obtain the concrete modulator.
The concrete modifier of the embodiment is compounded with the polycarboxylate water reducer, and is added into cement concrete for mixing, and slump, expansion degree, bleeding rate ratio and compressive strength are tested.
Example IV
The concrete modulator of the embodiment is prepared from the following raw materials in parts by weight: 5 parts of six-carbon polyether macromonomer (with the molecular weight of 3000), 8 parts of acrylic acid, 80 parts of acrylamide, 5 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 parts of methacrylic acid phosphate, 5 parts of isoprene, 0.03 part of ammonium persulfate and 722 parts of deionized water.
The preparation method of the concrete modulator specifically comprises the following steps: adding a six-carbon polyether macromonomer, acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, methacrylic acid phosphate, isoprene and deionized water into a reaction kettle, heating to 55 ℃, stirring until the components are completely dissolved, adding ammonium persulfate, continuously stirring for 1.5 hours, stopping stirring and preserving heat for 12 hours, adding liquid alkali for neutralization, and stirring for 20 minutes to obtain the concrete modulator.
The concrete modifier of the embodiment is compounded with the polycarboxylate water reducer, and is added into cement concrete for mixing, and slump, expansion degree, bleeding rate ratio and compressive strength are tested.
Example five
The concrete modulator of the embodiment is prepared from the following raw materials in parts by weight: 8 parts of isobutylether (molecular weight of 5000), 5 parts of acrylic acid, 75 parts of acrylamide, 5 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 parts of acrylic acid phosphate, 5 parts of 1,3 butadiene, 0.03 part of ammonium persulfate and 920 parts of deionized water.
The preparation method of the concrete modulator specifically comprises the following steps: adding the isobutylether, the acrylic acid, the acrylamide, the 2-acrylamide-2-methylpropanesulfonic acid, the acrylic acid phosphate, the 1,3 butadiene and the deionized water into a reaction kettle, heating to 50 ℃, stirring until the mixture is completely dissolved, adding the ammonium persulfate, continuously stirring for 1-2 hours, stopping stirring, preserving heat for 13 hours, adding liquid alkali for neutralization, and stirring for 15 minutes to obtain the concrete modulator.
The concrete modifier of the embodiment is compounded with the polycarboxylate water reducer, and is added into cement concrete for mixing, and slump, expansion degree, bleeding rate ratio and compressive strength are tested.
Comparative example one
The cement concrete is not added with any water-retaining agent or concrete modifier, and only the polycarboxylate water reducer is added, so that the slump, the expansion degree, the bleeding rate ratio and the compressive strength of the cement concrete are tested.
Comparative example two
The slump, the expansion degree, the bleeding rate ratio and the compressive strength of the cement concrete are tested by adding a common water-retaining agent sold in the market into the cement concrete.
The concrete modulators prepared in the first, second, third, fourth and fifth examples were used in combination with the polycarboxylic acid water reducer, which was the polycarboxylic acid water reducer mother liquor P1 produced by the major construction materials company of the Shijia city, compared with the comparative examples one and two. The effect on concrete slump, expansion, bleeding rate and strength were tested separately using the concrete mix ratios shown in table 2. The experiment is carried out according to GB/T50080-2016 Standard for Performance test of common concrete mixtures.
Table 1 concrete composition material ratios
Table 2 results of concrete performance test
Table 2 shows that: compared with the common water-retaining agent in the market without the water-retaining agent, the concrete prepared by adding the concrete modifier has good fluidity, small slump loss and low bleeding rate, can better solve the problems of concrete segregation and bleeding, and can improve the compressive strength of the concrete.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Claims (8)
1. A concrete modulator, characterized by: the preparation raw materials of the concrete modulator comprise the following components in parts by weight: 5-8 parts of polyether macromonomer, 3-8 parts of acrylic acid, 70-80 parts of acrylamide, 3-8 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-8 parts of unsaturated phosphate, 5-10 parts of organic matters with two carbon-carbon double bonds, 0.02-0.04 part of initiator and 600-1000 parts of deionized water;
the unsaturated phosphate comprises at least one of acrylic acid phosphate, methacrylic acid phosphate and hydroxyethyl methacrylate phosphate;
the polyether macromonomer comprises at least one of isobutenyl alcohol polyoxyethylene ether, isopentenyl alcohol polyoxyethylene ether and six-carbon polyether macromonomer;
the organic matter with two carbon-carbon double bonds comprises at least one of methyl 1, 3-butadiene, ethyl 2, 3-butadiene, benzyl 2, 3-butadiene, isoprene and 1, 3-butadiene.
2. The concrete modulator according to claim 1, wherein: the molecular weight of the polyether macromonomer is 2400-5000.
3. The concrete modulator according to claim 1 or 2, characterized in that: the initiator is ammonium persulfate or hydrogen peroxide.
4. A method of preparing the concrete modulator of any one of claims 1-3, characterized by: and uniformly mixing and dissolving a polyether macromonomer, acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, unsaturated phosphate, an organic matter with two carbon-carbon double bonds and deionized water, adding an initiator, adding alkali to neutralize to pH=6-8, and uniformly stirring to obtain the concrete modulator.
5. The method for preparing a concrete modulator according to claim 4, wherein: the reaction temperature is controlled between 50 ℃ and 60 ℃.
6. A concrete admixture characterized in that: the concrete admixture comprising the concrete admixture according to any one of claims 1 to 3.
7. The concrete admixture according to claim 6, wherein: the concrete admixture further comprises a polycarboxylate water reducer.
8. A concrete composition characterized in that: the raw materials for preparing the concrete composition comprise the concrete modulator according to any one of claims 1 to 3.
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