Calcium-resistant concrete thickener and preparation method thereof

A thickener and concrete technology, applied in the field of calcium-resistant concrete thickener and preparation, can solve the problems of water reducing agent interference, etc., to improve the dispersion of slurry, increase zeta potential value, improve workability and workability sexual effect

Pending Publication Date: 2020-12-11
STATE GRID JIBEI ELECTRIC POWER COMPANY +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, the molecular structure of polyacrylic acid is modified, and different functional groups are introduced into the side chain to improve its thickening performance and other properties, but the side chain of common polyacrylic acid thickener contains a large amount of calcium-sensitive Active groups such as carboxyl groups, its polymer molecules are easy to agglomerate and precipitate in high alkali salt solution, which has a great influence on the structure and encapsulation of the slurry, and has a strong interference effect on the water reducer

Method used

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  • Calcium-resistant concrete thickener and preparation method thereof
  • Calcium-resistant concrete thickener and preparation method thereof
  • Calcium-resistant concrete thickener and preparation method thereof

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Embodiment 1-14

[0034] Mix sodium methacrylate sulfonate (MAS), isobutenol (Isobutenol), and hydroxyethyl acrylate (HEA) to prepare a solution with a mass fraction of 10% (note: solution A); the initiator is ammonium persulfate (APS ), its dosage is 0.3-0.5% of the total mass of the monomer (sodium methacrylic acid sulfonate, isobutenol, hydroxyethyl acrylate), and it is prepared into a solution with a mass fraction of 1% (note: solution B), and evenly divides Three parts; the chain transfer agent is mercaptoethanol (QC), and its consumption is 0.1-0.3% of the total mass of the monomers, prepared into a 1% solution (note: solution C), and divided into three parts. Stir the A solution at 25±5°C, add the above B and C solutions to the A solution three times, and the interval between each two is 30min. Finally, the mixed solution was stirred for 30 minutes to obtain the anti-calcium concrete thickener of the present invention. Each embodiment thickener ratio is shown in table 1; Concrete ratio ...

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Abstract

The invention discloses a calcium-resistant concrete thickener, which is prepared from the following components in parts by mass: 158 parts of sodium methacrylate sulfonate, 216-360 parts of isobutylene alcohol, 48-580 parts of hydroxyethyl acrylate, 2.89-4.29 parts of an initiator and 0.86-2.57 parts of a chain transfer agent. The thickener provided by the invention can significantly improve theworking performance of fresh concrete and improve the wrapping property and cohesiveness of slurry, the slump of the thickener is greater than 230 mm, the expansion degree of the thickener is greaterthan 700 mm, the thickener is free of segregation and bleeding, and the preparation method provided by the invention is simple and convenient.

Description

technical field [0001] The invention relates to a thickener and a preparation method, in particular to a calcium-resistant concrete thickener and a preparation method. Background technique [0002] With the rapid development of the concrete industry, high fluidity and high stability have become necessary conditions for the excellent working performance of concrete. In actual concrete engineering, bleeding and segregation are two common problems that affect the performance of concrete. [0003] Thickeners can be divided into inorganic thickeners and organic thickeners. Inorganic thickeners include bentonite, montmorillonite and other viscous minerals; organic thickeners include polyacrylamide, polyacrylic acid, cellulose ethers, and Bioglue etc. These thickeners can solve the problems of concrete bleeding and segregation to a certain extent, but their compatibility with water reducers and the sensitivity of their dosage have not been resolved. Clay minerals such as bentoni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/20C08F216/04C08F228/02C04B24/16C04B103/44
CPCC08F220/20C04B24/163C04B2103/44C08F216/04C08F228/02
Inventor 罗毅张琰谭洪波王鑫卫超
Owner STATE GRID JIBEI ELECTRIC POWER COMPANY
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