CN111116084A - Concrete high-efficiency water-reducing additive and preparation method thereof - Google Patents
Concrete high-efficiency water-reducing additive and preparation method thereof Download PDFInfo
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- CN111116084A CN111116084A CN201911393875.1A CN201911393875A CN111116084A CN 111116084 A CN111116084 A CN 111116084A CN 201911393875 A CN201911393875 A CN 201911393875A CN 111116084 A CN111116084 A CN 111116084A
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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
- 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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a concrete high-efficiency water-reducing admixture and a preparation method thereof, wherein the concrete high-efficiency water-reducing admixture comprises a first monomer, a second monomer, a third monomer, a polymerization initiator and a regulator; the first monomer is methacrylic acid, the second monomer is ethyl acrylate, the third monomer is sodium allylsulfonate, the polymerization initiator is ammonium persulfate and benzoyl peroxide, and the regulator is mercaptoacetic acid. The benzoyl peroxide is added to serve as an initiator of polymerization reaction on one hand, and on the other hand, excessive initiator after reaction can form part of hydrogen peroxide under certain pH value, so that the additive forms a large amount of micro bubbles in the concrete manufacturing process, has the function of an air entraining agent and further enhances the frost resistance of concrete.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a concrete high-efficiency water-reducing admixture and a preparation method thereof.
Background
The concrete admixture is a chemical substance which is added in the process of stirring the concrete, accounts for less than 5 percent of the mass of the cement and can obviously improve the performance of the concrete. The concrete admixture has the characteristics of multiple varieties, small mixing amount, great influence on the performance of concrete, low investment, quick response and obvious technical and economic benefits. With the continuous progress of scientific technology, the additive has been used more and more, and the additive has become the 5 th important component of concrete besides 4 basic components.
At present, concrete admixtures are various in types and multiple in functions, different types of additives are required to be added into the concrete in order to enable the concrete to achieve different functional characteristics, the operation is excessively complicated, and whether mutual exclusion exists among the various admixtures needs to be considered, particularly in the aspects of water reducing property, air introducing property and frost resistance of the concrete. Therefore, it is of great practical significance to develop a concrete admixture capable of solving the above problems.
Disclosure of Invention
The invention aims to solve the problems and provide a concrete high-efficiency water-reducing admixture with simple structure and reasonable design and a preparation method thereof.
The invention realizes the purpose through the following technical scheme:
an efficient water-reducing additive for concrete is composed of the first monomer, the second monomer, the third monomer, polymerization initiator and regulator.
As a further optimized scheme of the invention, the monomer comprises 70-80 parts of first monomer, 5-10 parts of second monomer, 5-10 parts of third monomer, 1-5 parts of polymerization initiator and 1-5 parts of regulator by weight.
As a further optimization scheme of the invention, the first monomer is methacrylic acid, the second monomer is ethyl acrylate, the third monomer is sodium allylsulfonate, the polymerization initiator is ammonium persulfate and benzoyl peroxide, and the regulator is mercaptoacetic acid.
As a further optimization scheme of the invention, the adding proportion of the ammonium persulfate to the benzoyl peroxide is 1: 2.
a preparation method of the concrete high-efficiency water-reducing admixture comprises the following steps:
step S1: adding a first monomer and a second monomer into a reaction kettle, gradually adding a polymerization hair agent and a regulator under the condition of heating and stirring, and continuously reacting;
step S2: continuously adding a third monomer, a polymerization initiator and a regulator on the basis of the step S1, continuously heating and stirring at constant temperature, and continuously reacting;
step S3: after the reaction of step S2 is finished, a pH regulator is added into the mixture, and the water-reducing admixture is finally obtained after stirring.
As a further optimization scheme of the invention, the heating temperature in the step S1 is 80-90 ℃, and the reaction is continued for 1-2 h.
As a further optimization scheme of the invention, the step S2 is continuously reacted for 1-2h, and the pH value in the step S3 is adjusted to 6.5-7.5.
The invention has the beneficial effects that:
1) according to the invention, a certain proportion of polymerized monomers is added, and a part of monomers are polymerized into large monomers and then polymerized with a part of small monomers to finally obtain the water-reducing admixture with stable chemical properties;
2) the invention adds the mixture of ammonium persulfate and benzoyl peroxide as a polymerization initiator into the water-reducing admixture, and plays a role in initiating reaction in the polymerization reaction;
3) the benzoyl peroxide is added to serve as an initiator of polymerization reaction on one hand, and on the other hand, excessive initiator after reaction can form part of hydrogen peroxide under certain pH value, so that the admixture forms a large amount of micro bubbles in the concrete manufacturing process, has the function of an air entraining agent and further enhances the frost resistance of concrete;
4) the method is simple, high in stability, reasonable in design and convenient to implement.
Detailed Description
The present application is described in further detail below, and it should be noted that the following detailed description is provided for illustrative purposes only, and is not intended to limit the scope of the present application, which is defined by the appended claims.
Example 1
The preparation method of the concrete high-efficiency water-reducing admixture comprises the following steps:
step S1: adding 70-80 parts by weight of first monomer methacrylic acid and 5-10 parts by weight of second monomer ethyl acrylate into a reaction kettle, gradually adding a polymerization hair agent and a regulator under the condition of heating and stirring at 80-90 ℃, and continuously reacting for 1-2 hours;
step S2: continuously adding 5-10 parts of third monomer sodium allylsulfonate, a polymerization initiator and a regulator on the basis of the step S1, continuously stirring at constant temperature of 80-90 ℃, and continuously reacting for 1-2 h;
step S3: after the reaction of step S2 is completed, a pH adjusting agent is added thereto with stirring to a pH of 6.5 to 7.5, to finally obtain the water-reducing admixture.
The polymerization initiator is ammonium persulfate and benzoyl peroxide, the adding ratio of the ammonium persulfate to the benzoyl peroxide is 1:2, and the regulator is mercaptoacetic acid.
Example 2
The preparation method of the concrete high-efficiency water-reducing admixture comprises the following steps:
step S1: adding 70 parts by weight of first monomer methacrylic acid and 5 parts by weight of second monomer ethyl acrylate into a reaction kettle, gradually adding a polymerization hair agent and a regulator mercaptoacetic acid under the condition of heating and stirring at 80 ℃, and continuously reacting for 2 hours;
step S2: continuously adding 5 parts of third monomer sodium allylsulfonate, a polymerization initiator and a regulator on the basis of the step S1, continuously stirring at constant temperature of 80 ℃, and continuously reacting for 2 hours;
step S3: after the reaction of step S2 is completed, a pH adjusting agent is added thereto with stirring to a pH of 6.5, to finally obtain the water-reducing admixture.
The polymerization initiator is ammonium persulfate and benzoyl peroxide, and the addition ratio of the ammonium persulfate to the benzoyl peroxide is 1: 2.
Example 3
The preparation method of the concrete high-efficiency water-reducing admixture comprises the following steps:
step S1: adding 75 parts by weight of first monomer methacrylic acid and 10 parts by weight of second monomer ethyl acrylate into a reaction kettle, gradually adding a polymerization hair agent and a regulator mercaptoacetic acid under the condition of heating and stirring at 90 ℃, and continuously reacting for 1 hour;
step S2: continuously adding 10 parts of third monomer sodium allylsulfonate, a polymerization initiator and a regulator on the basis of the step S1, continuously stirring at constant temperature of 90 ℃, and continuously reacting for 1 h;
step S3: after the reaction of step S2 is completed, a pH adjusting agent is added thereto with stirring to a pH of 7, to finally obtain the water-reducing admixture.
The polymerization initiator is ammonium persulfate and benzoyl peroxide, and the addition ratio of the ammonium persulfate to the benzoyl peroxide is 1: 2.
Example 4
The preparation method of the concrete high-efficiency water-reducing admixture comprises the following steps:
step S1: adding 80 parts by weight of first monomer methacrylic acid and 10 parts by weight of second monomer ethyl acrylate into a reaction kettle, gradually adding a polymerization hair agent and a regulator mercaptoacetic acid under the condition of heating and stirring at 90 ℃, and continuously reacting for 1 hour;
step S2: continuously adding 10 parts of third monomer sodium allylsulfonate, a polymerization initiator and a regulator on the basis of the step S1, continuously stirring at constant temperature of 90 ℃, and continuously reacting for 1 h;
step S3: after the reaction of step S2 is completed, a pH adjusting agent is added thereto with stirring to a pH of 7.5, to finally obtain the water-reducing admixture.
The polymerization initiator is ammonium persulfate and benzoyl peroxide, and the addition ratio of the ammonium persulfate to the benzoyl peroxide is 1: 2.
Comparative example 1
The preparation method of the concrete high-efficiency water-reducing admixture comprises the following steps:
step S1: adding 75 parts by weight of first monomer methacrylic acid and 10 parts by weight of second monomer ethyl acrylate into a reaction kettle, gradually adding a polymerization hair agent and a regulator mercaptoacetic acid under the condition of heating and stirring at 90 ℃, and continuously reacting for 1 hour;
step S2: continuously adding 10 parts of third monomer sodium allylsulfonate, a polymerization initiator and a regulator on the basis of the step S1, continuously stirring at constant temperature of 90 ℃, and continuously reacting for 1 h;
step S3: after the reaction of step S2 is completed, a pH adjusting agent is added thereto with stirring to a pH of 7, to finally obtain the water-reducing admixture.
The polymerization initiator is ammonium persulfate.
Comparative example 2
The preparation method of the concrete high-efficiency water-reducing admixture comprises the following steps:
step S1: adding 75 parts by weight of first monomer methacrylic acid and 10 parts by weight of second monomer ethyl acrylate into a reaction kettle, gradually adding a polymerization hair agent and a regulator mercaptoacetic acid under the condition of heating and stirring at 90 ℃, and continuously reacting for 1 hour;
step S2: continuously adding 10 parts of third monomer sodium allylsulfonate, a polymerization initiator and a regulator on the basis of the step S1, continuously stirring at constant temperature of 90 ℃, and continuously reacting for 1 h;
step S3: after the reaction of step S2 is completed, a pH adjusting agent is added thereto with stirring to a pH of 7, to finally obtain the water-reducing admixture.
The polymerization initiator is benzoyl peroxide.
Test 1: detection of frost resistance of concrete water-reducing admixture
The premixed concrete premix was equally divided into 3 parts, to which equal amounts of the admixture obtained in example 3, comparative example 1 and comparative example 2 were added, respectively, to finally obtain corresponding concrete, and the slump, air content and compressive strength of each concrete were measured, respectively, and the results thereof are shown in the following table 1:
the results in the table above show that: after the admixture obtained in the example 3 is added, the air content of the prepared concrete is obviously increased, and the strength of the prepared concrete has certain advantages compared with that of a comparative example; in addition, after the benzoyl peroxide is added, the concrete is equivalently added with a certain air entraining agent, tiny air bubbles formed after the concrete is hardened are different from 'retained' air in the uncompacted concrete, the 'retained' air in the uncompacted concrete is often irregular in shape, is larger and unevenly distributed, is different in volume and size, is unstable during vibration and has no benefit on the concrete. The air bubbles formed by the concrete added with the air entraining agent not only have proper volume, but also can form a proper form, namely, the air bubbles appear in the form of a large amount of small air bubbles instead of a small amount of large air bubbles. This is because the air entraining agent is generally an anionic surfactant, which acts as a surfactant for the air entraining agent, directing polar groups at the air-water interface towards the water, reducing the surface tension of the system, promoting bubble formation and preventing the tendency for dispersed bubbles to coalesce. The polar groups are combined with the solid phase by the directional force on the solid-water interface, so that the non-polar groups are directed to water, and therefore, air bubbles introduced during the mixing of the concrete can exist in a relatively stable form, and the diameter of the air bubbles is relatively small and uniform. A large number of tiny bubbles with regular shapes can reduce the harm of water pressure, thereby improving the frost resistance of the concrete.
According to the invention, a certain proportion of polymerized monomers is added, and a part of monomers are polymerized into large monomers and then polymerized with a part of small monomers to finally obtain the water-reducing admixture with stable chemical properties; the invention adds the mixture of ammonium persulfate and benzoyl peroxide as a polymerization initiator into the water-reducing admixture, and plays a role in initiating reaction in the polymerization reaction; the benzoyl peroxide is added to serve as an initiator of polymerization reaction on one hand, and on the other hand, excessive initiator after reaction can form part of hydrogen peroxide under certain pH value, so that the additive forms a large amount of micro bubbles in the concrete manufacturing process, has the function of an air entraining agent and further enhances the frost resistance of concrete.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (7)
1. The concrete high-efficiency water-reducing admixture is characterized in that: comprises a first monomer, a second monomer, a third monomer, a polymerization initiator and a regulator.
2. The concrete high-efficiency water-reducing admixture according to claim 1, characterized in that: the adhesive comprises, by weight, 70-80 parts of a first monomer, 5-10 parts of a second monomer, 5-10 parts of a third monomer, 1-5 parts of a polymerization initiator and 1-5 parts of a regulator.
3. The concrete high-efficiency water-reducing admixture according to claim 1, characterized in that: the first monomer is methacrylic acid, the second monomer is ethyl acrylate, the third monomer is sodium allylsulfonate, the polymerization initiator is ammonium persulfate and benzoyl peroxide, and the regulator is mercaptoacetic acid.
4. The concrete high-efficiency water-reducing admixture according to claim 3, characterized in that: the adding proportion of the ammonium persulfate to the benzoyl peroxide is 1: 2.
5. a method for preparing the concrete high-efficiency water-reducing admixture according to any one of claims 1 to 4, which comprises the following steps:
step S1: adding a first monomer and a second monomer into a reaction kettle, gradually adding a polymerization hair agent and a regulator under the condition of heating and stirring, and continuously reacting;
step S2: continuously adding a third monomer, a polymerization initiator and a regulator on the basis of the step S1, continuously heating and stirring at constant temperature, and continuously reacting;
step S3: after the reaction of step S2 is finished, a pH regulator is added into the mixture, and the water-reducing admixture is finally obtained after stirring.
6. The preparation method of the concrete high-efficiency water-reducing admixture according to claim 5, which is characterized in that: the heating temperature in the step S1 is 80-90 ℃, and the reaction is continued for 1-2 h.
7. The preparation method of the concrete high-efficiency water-reducing admixture according to claim 5, which is characterized in that: the step S2 continues the reaction for 1-2h, and the pH is adjusted to 6.5-7.5 in the step S3.
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| CN110204663A (en) * | 2019-05-30 | 2019-09-06 | 上海宏韵新型建材有限公司 | Viscosity reduction type polycarboxylic acid concrete additive |
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| CN101353397A (en) * | 2008-09-16 | 2009-01-28 | 中国矿业大学(北京) | Water-soluble grafting polycarboxylic acids dehydragent and preparation thereof |
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