CN110922089B - Concrete additive and preparation method thereof - Google Patents
Concrete additive and preparation method thereof Download PDFInfo
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- CN110922089B CN110922089B CN201911243088.9A CN201911243088A CN110922089B CN 110922089 B CN110922089 B CN 110922089B CN 201911243088 A CN201911243088 A CN 201911243088A CN 110922089 B CN110922089 B CN 110922089B
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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
- 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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Abstract
The invention discloses a concrete admixture and a preparation method thereof, belonging to the technical field of tubular pile concrete, and the concrete admixture is obtained by polymerizing raw materials comprising 100 parts of methyl allyl polyoxyethylene ether, 18-25 parts of acrylic acid, 5.5-18.5 parts of modified composite powder, 2.5-3 parts of an oxidant in a redox initiator, 0.4-0.8 part of a reducing agent in the redox initiator and 3.5-3.8 parts of a chain transfer agent. Preparing modified composite powder: a, roasting the composite powder at the temperature of 430-450 ℃, wherein the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.1-0.5; b, adding the roasted composite powder into an ethanol solution, adjusting the pH to 4.5-4.6, stirring at 65-70 ℃, dropwise adding a silane coupling agent aqueous solution with the mass concentration of 4-6%, stirring for 2.5-3.5h, filtering under reduced pressure to remove the solvent, and drying under vacuum to obtain the composite powder. The prepared concrete admixture can improve the mechanical properties of the tubular pile concrete such as breaking strength, compressive strength and the like, and improve common quality problems such as pile body breakage, pile top or pile tip breakage and the like in the construction process of the prestressed tubular pile.
Description
Technical Field
The invention relates to the technical field of tubular pile concrete, in particular to a concrete admixture and a preparation method thereof.
Background
The prestressed pipe pile is a hollow cylinder body elongated concrete prefabricated component, is often used as the foundation of buildings such as industrial and civil buildings, roads, bridges and the like, and has the advantages of simple construction process, reliable quality, lower manufacturing cost, convenient detection and the like.
The prestressed pipe pile is sunk underground in a hammering or static pressure mode in the construction process. However, the existing prestressed pipe piles have some common quality problems in the construction process, such as pile body breakage, pile top or pile tip breakage and the like. The major reason for this problem is that the concrete used to make the prestressed pipe pile has poor mechanical properties such as flexural strength and compressive strength.
The concrete admixture has great influence on the mechanical properties of the concrete, such as the breaking strength, the compressive strength and the like, so that the development of a new concrete admixture and the development of new prestressed pipe pile concrete have great significance for improving the common quality problems in the construction process of the prestressed pipe pile.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the following steps: provides a concrete admixture to achieve the effect of improving the mechanical properties of the tubular pile concrete, such as breaking strength, compressive strength and the like.
The first purpose of the invention is realized by the following technical scheme:
a preparation method of concrete admixture is prepared by polymerization reaction of raw materials comprising 100 parts by weight of methyl allyl polyoxyethylene ether, 18-25 parts by weight of acrylic acid, 5.5-18.5 parts by weight of modified composite powder, 2.5-3 parts by weight of oxidant in redox initiator, 0.4-0.8 part by weight of reducing agent in redox initiator and 3.5-3.8 parts by weight of chain transfer agent,
the preparation method of the modified composite powder comprises the following steps:
a, roasting the composite powder at the temperature of 360-400 ℃ for 2-3h, wherein the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.1-0.5; b, adding 100 parts of the roasted composite powder into an ethanol solution, uniformly stirring, adjusting the pH to 4.5-4.6, pre-stirring at 65-70 ℃, dropwise adding 90-110 parts of a silane coupling agent aqueous solution with the mass concentration of 4-6%, continuously stirring for 2.5-3.5h, filtering under reduced pressure to remove the solvent, and drying under vacuum to obtain the modified composite powder.
The diatomite is a siliceous mineral and mainly comprises amorphous SiO2And also contains a small amount of impurities. SiO of diatomaceous earth2The content is more than 80 percent, and a small amount of impurities mainly comprise Al2O3、Fe2O3、CaO、MgO、K2O、Na2O、P2O5And organic matter. Diatomite has porosity and is commonly used as an adsorbent, and the report of the diatomite for modifying the synthetic concrete admixture is not found.
The zeolite powder is prepared by grinding natural zeolite rock, and has light green color,White. The main component of the zeolite powder is SiO2The content is more than 60 percent, and other components comprise Al2O3、Fe2O3、CaO、MgO、K2O and TiO2And the like. The zeolite powder is commonly used as a fish feed additive and a water quality purifying agent, and can also be used as an admixture to be directly mixed into concrete to improve the workability of the concrete, but the report of the zeolite powder for modifying a synthetic concrete additive is not seen.
By adopting the scheme, the modified composite powder is added in the polymerization reaction, wherein in the preparation of the modified composite powder, two kinds of powder of diatomite and zeolite powder are selected, and a double modification means of firstly roasting treatment and then silane coupling agent treatment is adopted. Experiments prove that aiming at the invention, the modified composite powder prepared by the method and other raw materials jointly participate in polymerization reaction, and the obtained novel concrete admixture can effectively improve the fluidity of cement paste or concrete, so that the mechanical properties of the concrete such as breaking strength, compressive strength and the like can be obviously improved when the concrete is prepared. The characteristics of the concrete admixture of the invention can be related to the introduction of the silicon hydroxyl in the concrete admixture by adding the modified composite powder.
The concrete admixture prepared by the invention is used for preparing the tubular pile concrete, has important significance for improving common quality problems such as pile body breakage, pile top or pile tip breakage and the like in the construction process of the prestressed tubular pile, and provides a new improvement scheme and an improvement idea for enhancing the performance of the concrete admixture.
The invention is further configured to: the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.3-0.4.
The weight ratio of the diatomaceous earth and the zeolite powder has an important influence on the performance of the concrete admixture of the present invention. Experimental data show that aiming at the proportion of the invention, when the weight ratio of the diatomite to the zeolite powder is within the numerical range, the performance of the obtained concrete admixture is more excellent, and the fluidity of cement paste or concrete can be further improved, so that the mechanical properties of the concrete, such as breaking strength, compressive strength and the like, are improved.
The invention is further configured to: in the step a of the preparation method of the modified composite powder, the roasting temperature is 375-380 ℃.
Experimental data show that the roasting temperature has a great influence on the performance of the concrete admixture, and when the roasting temperature is 375-380 ℃, the fluidity enhancing performance of the concrete admixture on cement paste or concrete is better, which is probably related to the influence of over-high or over-low temperature on the capability of introducing the silicon hydroxyl into the concrete admixture by the modified composite powder.
The invention is further configured to: the silane coupling agent comprises vinyl trioxymethylsilane and methacryloyloxymethyl triethoxysilane in a weight ratio of 1: 1.2-1.5.
In the process of modifying the composite powder containing the diatomite and the zeolite powder, the selection of the silane coupling agent has certain influence on the performance of the final concrete admixture, when the silane coupling agent selects the vinyltrioxymethylsilane and the methacryloxymethyltriethoxysilane and limits the proportion of the vinyltrioxymethylsilane and the methacryloxymethyltriethoxysilane to be in the range, the obtained concrete admixture has better fluidity enhancing performance on cement paste or concrete, which is probably related to the fact that the two silane coupling agents can introduce alkylene and methacryloxyalkyl on the surfaces of the diatomite and the zeolite powder, and therefore the performance of the concrete admixture prepared from the raw materials containing the modified composite powder is enhanced.
The invention is further configured to: the oxidizing agent is potassium persulfate, and the reducing agent is sodium bisulfite.
The invention is further configured to: the chain transfer agent is sodium methallyl sulfonate.
The invention is further configured to: the temperature of the polymerization reaction is 58-62 ℃.
The invention is further configured to include the steps of:
mixing methyl allyl polyoxyethylene ether, modified composite powder, an oxidant in a redox initiator, a chain transfer agent and deionized water, heating to 58-62 ℃, simultaneously dropwise adding acrylic acid and a reducing agent in the redox initiator for polymerization reaction, cooling to obtain a product liquid, adjusting the pH of the product liquid to 6-6.5, and stirring at a constant temperature to obtain the concrete admixture.
Object two of the present invention: provides a concrete admixture prepared by the preparation method.
In conclusion, the invention has the following beneficial effects:
in the preparation of the concrete admixture, the modified composite powder containing the diatomite and the zeolite powder is added, and the obtained concrete admixture can effectively improve the fluidity of cement paste or concrete, thereby improving the mechanical properties of the concrete, such as breaking strength, compressive strength and the like, and providing a new improvement scheme and an improvement idea for enhancing the performance of the concrete admixture.
Detailed Description
The present invention will be described in further detail below.
Introduction of raw materials diatomaceous earth was purchased from henan super-win environmental protection technology limited, and the physical and chemical properties are shown in table 1:
TABLE 1 physical and chemical Properties of diatomaceous Earth
The zeolite powder is purchased from a Guishou county Peng apparent mineral processing factory, and the physical and chemical properties are shown in Table 2:
TABLE 2 Zeolite powder physico-chemical Properties
Vinyltrioxymethylsilane, the content of which is more than or equal to 98 percent, Shandong-Xiya chemical industry Co., Ltd;
methacryloyloxymethyl triethoxysilane, 98% content, available from Zhengzhou Jex chemical products Co., Ltd;
methallyl polyoxyethylene ether, TPEG-2400, available from national mechanical chemical Co., Haian county;
acrylic acid (content: 98%) and potassium persulfate (content: 99.5%) were obtained from national pharmaceutical group chemical reagent GmbH, sodium bisulfite and sodium methallyl sulfonate (2-methyl-2-propene-1-sulfonic acid sodium salt, content: 98%).
Example 1
A concrete admixture is provided, which comprises a concrete admixture,
the raw materials adopted by weight portion comprise:
base solution: 100 parts of methyl allyl polyoxyethylene ether, 5.5 parts of modified composite powder, 3.8 parts of chain transfer agent sodium methyl propylene sulfonate, 3 parts of oxidizing agent potassium persulfate in redox initiator and 100 parts of deionized water;
solution A: 18 parts of acrylic acid and 40 parts of deionized water;
solution B: 0.8 part of reducing agent sodium bisulfite and 50 parts of deionized water in the redox initiator,
the preparation method of the modified composite powder comprises the following steps:
a, roasting the composite powder at 360 ℃ for 2h, wherein the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.1;
b, preparing 500 parts of a mixed solution a of anhydrous ethanol and water in a volume ratio of 1: 1; preparing 90 parts of aqueous solution b of a silane coupling agent with the mass concentration of 4%, wherein the silane coupling agent comprises vinyltrioxymethylsilane and methacryloxymethyltriethoxysilane in a weight ratio of 1: 1.2; adding 100 parts of the roasted composite powder into the mixed solution a, uniformly stirring, adjusting the pH to 4.5, pre-stirring for 25min at 65 ℃, dropwise adding an aqueous solution b of a silane coupling agent, continuously stirring for 2.5h, filtering under reduced pressure to remove the solvent, drying for 10h at 80 ℃ in vacuum to obtain modified composite powder,
the preparation method of the concrete admixture comprises the following steps:
a, heating the base solution to 58 ℃, and simultaneously dropwise adding the solution A and the solution B into the base solution, wherein the dropwise adding time of the solution A is 1 hour, and the dropwise adding time of the solution B is 1.5 hours; after the solution A and the solution B are completely dripped, keeping the temperature and reacting for 30 min; and b, adjusting the pH value to 6 by adopting a sodium hydroxide aqueous solution with the mass concentration of 32%, and stirring for 20min under the condition of heat preservation to obtain the concrete admixture.
Example 2
A concrete admixture is provided, which comprises a concrete admixture,
the raw materials adopted by weight portion comprise:
base solution: 100 parts of methyl allyl polyoxyethylene ether, 10 parts of modified composite powder, 3.6 parts of chain transfer agent sodium methyl propylene sulfonate, 2.7 parts of oxidizing agent potassium persulfate in redox initiator and 100 parts of deionized water;
solution A: 22 parts of acrylic acid and 40 parts of deionized water;
solution B: 0.6 part of reducing agent sodium bisulfite and 50 parts of deionized water in the redox initiator,
the preparation method of the modified composite powder comprises the following steps:
a, roasting the composite powder at 378 ℃ for 2.5h, wherein the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.35;
b, preparing 500 parts of a mixed solution a of anhydrous ethanol and water in a volume ratio of 1: 1; preparing 100 parts of aqueous solution b of a silane coupling agent with the mass concentration of 5%, wherein the silane coupling agent comprises vinyltrioxymethylsilane and methacryloxymethyltriethoxysilane in a weight ratio of 1: 1.3; adding 100 parts of the roasted composite powder into the mixed solution a, uniformly stirring, adjusting the pH to 4.5, pre-stirring for 30min at 67 ℃, dropwise adding 100 parts of aqueous solution b of a silane coupling agent, continuously stirring for 3h, filtering under reduced pressure to remove the solvent, drying for 10h at 80 ℃ in vacuum to obtain modified composite powder,
the preparation method of the concrete admixture comprises the following steps:
a, heating the base solution to 60 ℃, and simultaneously dropwise adding a solution A and a solution B into the base solution, wherein the dropwise adding time of the solution A is 1 hour, and the dropwise adding time of the solution B is 1.5 hours; after the solution A and the solution B are completely dripped, keeping the temperature and reacting for 30 min;
and b, adjusting the pH value to 6.3 by adopting a sodium hydroxide aqueous solution with the mass concentration of 32%, and stirring for 20min under the condition of heat preservation to obtain the concrete admixture.
Example 3
A concrete admixture is provided, which comprises a concrete admixture,
the raw materials adopted by weight portion comprise:
base solution: 100 parts of methyl allyl polyoxyethylene ether, 18.5 parts of modified composite powder, 3.5 parts of chain transfer agent sodium methyl propylene sulfonate, 2.5 parts of oxidizing agent potassium persulfate in redox initiator and 100 parts of deionized water;
solution A: 25 parts of acrylic acid and 40 parts of deionized water;
solution B: 0.4 part of reducing agent sodium bisulfite and 50 parts of deionized water in the redox initiator,
the preparation method of the modified composite powder comprises the following steps:
a, roasting the composite powder at 400 ℃ for 3h, wherein the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.5;
b, preparing 500 parts of a mixed solution a of anhydrous ethanol and water in a volume ratio of 1: 1; preparing 110 parts of aqueous solution b of a silane coupling agent with the mass concentration of 6%, wherein the silane coupling agent comprises vinyltrioxymethylsilane and methacryloxymethyltriethoxysilane in a weight ratio of 1: 1.5; adding 100 parts of the roasted composite powder into the mixed solution a, uniformly stirring, adjusting the pH to 4.6, pre-stirring for 35min at 70 ℃, dropwise adding 100 parts of aqueous solution b of a silane coupling agent, continuously stirring for 3.5h, filtering under reduced pressure to remove the solvent, drying for 10h at 80 ℃ in vacuum to obtain modified composite powder,
the preparation method of the concrete admixture comprises the following steps:
a, heating the base solution to 62 ℃, and simultaneously dropwise adding the solution A and the solution B into the base solution, wherein the dropwise adding time of the solution A is 1 hour, and the dropwise adding time of the solution B is 1.5 hours; after the solution A and the solution B are completely dripped, keeping the temperature and reacting for 30 min;
and b, adjusting the pH value to 6.5 by adopting a sodium hydroxide aqueous solution with the mass concentration of 32%, and stirring for 20min under the condition of heat preservation to obtain the concrete admixture.
Example 4
A concrete admixture, which is different from example 2 in that, in the step a of the preparation method of the modified composite powder, the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.1.
Example 5
A concrete admixture, which is different from example 2 in that, in the step a of the preparation method of the modified composite powder, the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.5.
Example 6
A concrete admixture, which is different from example 2 in that, in the step a of the preparation method of the modified composite powder, the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.3.
Example 7
A concrete admixture, which is different from example 2 in that, in the step a of the preparation method of the modified composite powder, the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.4.
Example 8
A concrete admixture, which is different from example 2 in that in the step a of the preparation method of the modified composite powder, the roasting temperature is 360 ℃.
Example 9
A concrete admixture, which is different from example 2 in that in the step a of the preparation method of the modified composite powder, the baking temperature is 400 ℃.
Example 10
A concrete admixture, which is different from example 2 in that, in the step a of the preparation method of the modified composite powder, the baking temperature is 375 ℃.
Example 11
A concrete admixture, which is different from example 2 in that in the step a of the preparation method of the modified composite powder, the baking temperature is 380 ℃.
Example 12
A concrete admixture is different from example 2 in that 100 parts of aqueous solution b of a silane coupling agent with the mass concentration of 5% is prepared in the step b of the preparation method of the modified composite powder, wherein the silane coupling agent comprises vinyltrioxymethylsilane and methacryloxymethyltriethoxysilane in a weight ratio of 1: 1.2.
Example 13
A concrete admixture is different from the concrete admixture in example 2 in that in the step b of the preparation method of the modified composite powder, 100 parts of aqueous solution b of a silane coupling agent with the mass concentration of 5% is prepared, wherein the silane coupling agent comprises vinyltrioxymethylsilane and methacryloxymethyltriethoxysilane in a weight ratio of 1: 1.5.
Comparative example 1
A concrete admixture, which is different from example 2 in that, in the step a of the preparation method of the modified composite powder, the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.05.
Comparative example 2
A concrete admixture, which is different from example 2 in that, in the step a of the preparation method of the modified composite powder, the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.6.
Comparative example 3
A concrete admixture, which is different from example 2 in that in the step a of the preparation method of the modified composite powder, the baking temperature is 350 ℃.
Comparative example 4
A concrete admixture, which is different from example 2 in that in the step a of the preparation method of the modified composite powder, the baking temperature is 410 ℃.
Comparative example 5
A concrete admixture differing from example 2 in that, in step b of the method for producing a modified composite powder, 100 parts of an aqueous solution b of a silane coupling agent having a mass concentration of 5% was prepared, wherein the silane coupling agent includes vinyltrioxymethylsilane.
Comparative example 6
A concrete admixture is different from the concrete admixture in example 2 in that in the step b of the preparation method of the modified composite powder, 100 parts of an aqueous solution b of a silane coupling agent with the mass concentration of 5% is prepared, wherein the silane coupling agent comprises methacryloyloxymethyltriethoxysilane.
Comparative example 7
The common polycarboxylic acid water reducing agent is sold in markets and purchased from Shandong Shansheng building materials Co.
Performance detection
The concrete admixtures of examples 1 to 13 and comparative examples 1 to 7 were subjected to the test for fluidity with time of cement paste in accordance with the regulations in GB/T8077-2000 "method for testing homogeneity of concrete admixture". The cement is P.O.32.5, the water cement ratio is 0.29, the concrete admixture folding and fixing mixing amount is 0.3 percent (calculated by the mass of the cement), the test temperature is 20 +/-2 ℃, and the results are shown in Table 3.
The concrete admixtures of examples 1 to 13 and comparative examples 1 to 7 were subjected to a cement strength test in accordance with the provisions of GB/T8077-2000 "method for testing homogeneity of concrete admixtures". The cement is P.O.32.5, the concrete admixture folding and fixing mixing amount is 0.3 percent (calculated by the mass of the cement), the test temperature is 20 +/-2 ℃, the relative humidity is 99 percent, and the results are shown in Table 4.
TABLE 3 influence of concrete admixture on fluidity of cement paste
TABLE 4 test results of the influence of concrete admixture on the strength of cement
As can be seen from tables 3 and 4, compared with comparative example 7, the concrete admixtures prepared in examples 1 to 3 can maintain a better fluidity of the cement paste, almost have no loss with time, and can significantly improve the cement strength, thereby proving that the concrete admixtures obtained by the preparation method provided by the invention have better performance, can effectively improve the fluidity of the cement paste, and thus achieve the efficacy of improving the mechanical properties of the concrete, such as flexural strength, compressive strength, and the like when used for preparing the concrete.
As can be seen by combining examples 4 to 7 with comparative examples 1 and 2, the weight ratio of diatomaceous earth and zeolite powder has an important influence on the performance of the concrete admixture obtained with respect to the preparation method of the present invention. When the weight ratio of the diatomite to the zeolite powder is 1:0.1-0.5, the concrete admixture has better performance of improving the fluidity of cement paste and the strength of cement. When the weight ratio of the diatomite to the zeolite powder is 1:0.3-0.4, the concrete admixture has better performance of improving the fluidity of cement paste and the strength of cement. When the weight ratio of the diatomite to the zeolite powder exceeds the range of 1:0.1-0.5, the performance of the concrete admixture is greatly reduced.
As can be seen by combining examples 8 to 11 and comparative examples 3 and 4, the calcination temperature of the modified composite powder has an important influence on the performance of the concrete admixture obtained with the preparation method of the present invention. When the roasting temperature is 360-400 ℃, the performance of the concrete admixture is better. When the roasting temperature is 375-380 ℃, the performance of the concrete admixture is better. When the roasting temperature exceeds the range of 360-400 ℃, the performances of improving the cement paste fluidity and enhancing the cement strength of the concrete admixture are greatly reduced. This may be related to the influence of the high or low temperature on the ability of the modified composite powder to introduce the silicon hydroxyl groups into the concrete admixture.
As can be seen by combining examples 12 and 13 with comparative examples 5 and 6, the weight ratios of vinyltrioxymethylsilane and methacryloxymethyltriethoxysilane in the silane coupling agent have an important influence on the properties of the concrete admixture obtained with respect to the production method of the present invention. When the weight ratio of the vinyltrioxymethylsilane to the methacryloxymethyltriethoxysilane is 1:1.2-1.5, the concrete admixture has better performance of improving the fluidity of cement paste and the strength of cement, and after the weight ratio exceeds the range, the performance of the concrete admixture is greatly reduced. The method is probably related to the difference of the quantity of the alkylene and the methacryloxy radical introduced on the surfaces of the diatomite and the zeolite powder by the two silane coupling agents with different weight ratios, and changes the group distribution on the surfaces of the diatomite and the zeolite powder, thereby changing the performance of the concrete admixture prepared from the raw materials including the modified composite powder.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (6)
1. A preparation method of the concrete admixture is characterized by comprising the following steps:
according to the weight portion, the modified acrylic acid,
the preparation method of the modified composite powder comprises the following steps:
a, roasting the composite powder at 378 ℃ for 2.5h, wherein the composite powder comprises diatomite and zeolite powder in a weight ratio of 1: 0.35;
b, preparing 500 parts of a mixed solution a of anhydrous ethanol and water in a volume ratio of 1: 1; preparing 100 parts of aqueous solution b of a silane coupling agent with the mass concentration of 5%, wherein the silane coupling agent comprises vinyltrioxymethylsilane and methacryloxymethyltriethoxysilane in a weight ratio of 1: 1.3; and (3) adding 100 parts of the roasted composite powder into the mixed solution a, uniformly stirring, adjusting the pH to 4.5, pre-stirring for 30min at 67 ℃, dropwise adding 100 parts of a silane coupling agent aqueous solution b, continuously stirring for 3h, filtering under reduced pressure to remove the solvent, and drying for 10h at 80 ℃ in vacuum to obtain the modified composite powder.
2. The method for producing a concrete admixture according to claim 1, characterized in that: the oxidizing agent is potassium persulfate, and the reducing agent is sodium bisulfite.
3. The method for producing a concrete admixture according to claim 1, characterized in that: the chain transfer agent is sodium methallyl sulfonate.
4. The method for producing a concrete admixture according to claim 1, characterized in that: the temperature of the polymerization reaction is 58-62 ℃.
5. The method for preparing a concrete admixture according to any one of claims 1 to 4, characterized by comprising the steps of:
mixing methyl allyl polyoxyethylene ether, modified composite powder, an oxidant in a redox initiator, a chain transfer agent and deionized water, heating to 58-62 ℃, simultaneously dropwise adding acrylic acid and a reducing agent in the redox initiator for polymerization reaction, cooling to obtain a product liquid, adjusting the pH of the product liquid to 6-6.5, and stirring at a constant temperature to obtain the concrete admixture.
6. A concrete admixture obtained by the production method according to any one of claims 1 to 5.
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| CN105384379A (en) * | 2015-12-10 | 2016-03-09 | 西安建筑科技大学 | White carbon black modified polycarboxylic acid water reducer and preparation method thereof |
| CN105754045A (en) * | 2016-03-02 | 2016-07-13 | 海南太和科技有限公司 | Silane coupling agent modified polycarboxylate superplasticizer and preparation method thereof |
| CN108658504A (en) * | 2018-05-02 | 2018-10-16 | 芜湖恒固混凝土材料有限公司 | A kind of compound antifreezer of concrete for salvaging |
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