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Preparation method of activated grinding aid for concrete composite admixture

A composite admixture and concrete technology, applied in the field of building materials, can solve the problem that the workability of the active concrete of the admixture is not very helpful, and achieve the effect of reducing the limit fineness, accelerating the wetting and penetration, and improving the activity

Active Publication Date: 2021-10-08
HUNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the currently commonly used grinding aids only play the role of grinding aids, and do not contribute much to the activity of admixtures and the workability of concrete.

Method used

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  • Preparation method of activated grinding aid for concrete composite admixture
  • Preparation method of activated grinding aid for concrete composite admixture
  • Preparation method of activated grinding aid for concrete composite admixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of an activated grinding aid for a concrete composite admixture, specifically comprising the following steps:

[0033] The first step is to take 25 parts of polyacrylamide with a molecular weight of 5 million; dissolve it in 500 parts of water, stir it well, dissolve it, and add 10 parts of 1mol / L dilute sulfuric acid to convert the electrically neutral PAM into " -NH 3 + ” group of cationic PAM solution;

[0034] In the second step, the solution obtained in the first step is heated to 60°C under an ultrasonic generator with a power of 300W and a frequency of 40-120kHz and stirred at a constant temperature for 1-2 hours; at the same time, 25 parts of 10% mass concentration of The K12 solution was added dropwise to the PAM solution at a uniform speed, and the dropwise addition was completed in 1 hour; after the dropwise addition was completed, the ultrasonic generator was turned off, the stirring was stopped, and the temperature was lowered to 50 °...

Embodiment 2

[0037] A preparation method of an activated grinding aid for a concrete composite admixture, specifically comprising the following steps:

[0038]The first step is to take 25 parts of polyacrylamide with a molecular weight of 1 million; dissolve it in 500 parts of water, stir well and dissolve it, add 10 parts of 1 mol / L dilute sulfuric acid, and convert the electrically neutral PAM into " -NH 3 + ” group of cationic PAM solution;

[0039] In the second step, the obtained solution was heated to 60°C under an ultrasonic generator with a power of 200W and a frequency of 40-120kHz and stirred at a constant temperature for 1 hour; at the same time, 50 parts of K12 solution with a mass concentration of 8% was uniformly added dropwise to the PAM In the solution, the dropwise addition was completed for 1 hour; after the dropwise addition was completed, the ultrasonic generator was turned off, the stirring was stopped, and the temperature was lowered to 50° C. for 1 hour.

[0040] ...

Embodiment 3

[0042] A preparation method of an activated grinding aid for a concrete composite admixture, specifically comprising the following steps:

[0043] The first step is to take 25 parts of polyacrylamide with a molecular weight of 10 million; dissolve it in 500 parts of water, fully stir and dissolve it, add 10 parts of 1mol / L dilute sulfuric acid, and convert the electrically neutral PAM into " -NH 3 + ” group of cationic PAM solution;

[0044] In the second step, the obtained solution was heated to 60°C under an ultrasonic generator with a power of 500W and a frequency of 40-120kHz and stirred at a constant temperature for 1 hour; at the same time, 15 parts of K12 solution with a concentration of 12% was uniformly added dropwise to the PAM solution , the dropwise addition was completed for 1 hour; after the dropwise addition was completed, the ultrasonic generator was turned off, the stirring was stopped, and the temperature was lowered to 50° C. for 1 hour.

[0045] In the t...

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Abstract

The invention provides a preparation method of an activated grinding aid for concrete composite admixture, comprising: pretreating polyacrylamide to obtain 3 + cationic polyacrylamide solution; add the K12 solution with a mass concentration of 8~12% to the cationic polyacrylamide solution at a constant speed, and at the same time, use an ultrasonic generator with a power of 200~500W and a frequency of 40~120kHz , heated to 60°C and stirred at a constant temperature for 1-2 hours; after the dropwise addition was completed, turn off the ultrasonic generator, stop stirring, and lower the temperature to 50°C for 1-2 hours; put the solution obtained after ultrasonication in a vacuum drying oven, without The activated grinding aid for the concrete composite admixture is obtained by evaporating, drying and concentrating at a temperature exceeding 50°C. The grinding aid prepared by the method of the invention can slowly release K12 molecules during the grinding process to continuously produce the grinding aiding effect, thereby greatly improving the grinding efficiency.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular, to a preparation method of an activated grinding aid for a concrete composite admixture. Background technique [0002] The currently used concrete admixtures (such as granulated blast furnace slag powder, limestone powder, etc.) directly add granular raw materials to the mill, add a single grinding aid (such as triethanolamine, etc.), and then grind. Compared with many polymer grinding aids, the admixture produced by this relatively simple method has the advantages of simplicity and low cost; the disadvantage is that there are two major problems of low grinding efficiency and low activity of the admixture. It is more prominent in raw materials with high hardness and poor activity (such as steel slag). [0003] Currently commonly used grinding aids, such as triethanolamine, surfactants, polymer dispersants, etc., whether used alone or in combination, all have the problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B24/16C04B103/52
CPCC04B40/0039C04B2103/52C04B24/2652C04B24/16
Inventor 秦一诚刘望洪李镓睿张叶高刘世雄周作添
Owner HUNAN UNIV
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