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High-strength concrete shrinkage reducing agent

A concrete shrinkage reducing agent and high-strength technology, which is applied in the field of building materials, can solve problems affecting the strength of concrete, and achieve the effects of preventing shrinkage cracking, enhancing strength, and improving group distribution

Inactive Publication Date: 2019-07-02
雷洪伍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a high-strength concrete shrinkage-reducing agent for the problem that the current high-strength concrete shrinkage-reducing agent still has shrinkage cracks after use, and even affects the strength of concrete.

Method used

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Examples

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Effect test

preparation example Construction

[0027] The preparation method of plasticizing active agent is:

[0028] (1) Take maleic anhydride and add active monomer at a mass ratio of 3~9:4~7, add acrylonitrile with 20~30% active monomer mass, stir and mix for 20~40min to obtain a mixture, and take the mixture at a mass ratio of 1 ~5: Add distilled water at 5~10, stir and mix at 40~50°C for 20~30min to get the mixture a;

[0029] (2) Take thioglycolic acid and add tetrabutylammonium bromide and distilled water according to the mass ratio of 3~5:1~3:10~20, stir and mix at 40~50°C for 20~30min to get the mixed solution a, take the mixed solution a According to the mass ratio of 40~50:2~5, add mixed solution b, add 10~20% of the mass of mixed solution a, formyloxyethyl trimethyl ammonium chloride, and then add 1~5% of mixed solution a Butyl hydroperoxide, keep warm at 50~60°C for 1~3h, adjust the pH to 7~8, cool to room temperature, and obtain the plasticizing active agent.

[0030] The sugar additive is: take glucose and ...

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Abstract

The invention discloses a high-strength concrete shrinkage reducing agent, and belongs to the technical field of building material. The high-strength concrete shrinkage reducing agent contains both positive ion groups and negative ion groups, is capable of improving distribution of carboxylate anion groups and effective adsorption on cement particles, increasing concrete strength, and preventing drying shrinkage cracking. According to a preparation method, tween-20 is added into a prepared mechanical reinforcing active agent for combination, so that emulsion demulsification is prevented, concrete porosity is reduced, and concrete internal mechanical performance and strength are increased. A prepared active agent capable of regulating surface tension contains amphoteric groups, so that concrete material drying shrinkage is reduced effectively. A plasticizing activator is adopted to increase concrete slurry fluidity firstly for water reducing slump retaining, plant oil is added to fill internal pores for improvement of density, and drying shirinkage prevention efficiency is increased. The high-strength concrete shrinkage reducing agent is capable of solving problems in the prior artthat shrinkage cracks still exist after adding of the concrete slump retaining agent, and influences on concrete strength are eliminated.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-strength concrete shrinkage reducing agent. Background technique [0002] Cement, a hydraulic cementitious material, has plasticity after being mixed with water, and at the same time has the cementing performance of bonding aggregates such as sand and gravel, and then gradually loses plasticity and hardens into a stone-like body with a certain strength, accompanied by volume shrinkage. The low water-to-binder ratio of modern high-performance concrete, as well as the use of mineral ultrafine powder and high-efficiency water reducer, further aggravate the self-shrinkage and drying shrinkage of concrete, and the shrinkage stress will cause cracks in concrete and reduce structural strength. , affecting the durability of concrete and shortening the service life of the building. For the shrinkage cracking of concrete, the main solutions at present are: op...

Claims

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Application Information

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IPC IPC(8): C04B24/38
CPCC04B40/0039C04B24/08C04B24/045C04B24/32C04B24/10C04B24/38C04B24/00C04B24/005
Inventor 雷洪伍
Owner 雷洪伍
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