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Admixture suitable for reducing hydration heat of mass concrete and preparation method thereof

A technology of large-volume concrete and admixture, applied in the field of concrete building materials, can solve the problems of limiting the application environment range of hydration heat materials, narrow phase transition temperature range, single phase transition system, etc. The effect of small changes and stable material properties

Active Publication Date: 2021-05-28
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above-mentioned existing technologies all have the problems of a single phase transition system and a narrow phase transition temperature range, which limits the application environment range of hydration heat materials.

Method used

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  • Admixture suitable for reducing hydration heat of mass concrete and preparation method thereof
  • Admixture suitable for reducing hydration heat of mass concrete and preparation method thereof
  • Admixture suitable for reducing hydration heat of mass concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The admixture suitable for reducing the heat of hydration of mass concrete prepared in this example comprises 60 wt% of polyether monomer containing double bonds, 15 wt% of unsaturated carboxylic acid monomer, and 3 wt% of propylene glycol in parts by weight , trishydroxymethylaminomethane 18wt%;

[0060] In the chemical structural formula of the polyether monomer containing double bonds, R 1 is a hydrogen atom, R 2 is a methyl group; X is an alkyl group with 2 carbon atoms; R 3 O is an alkoxy group with 2 carbon atoms, a=54, R 4 is a hydrogen atom;

[0061] In the chemical structural formula of the unsaturated carboxylic acid monomer, R 5 is a hydrogen atom, R 6 is carboxyl, R 7 is methyl;

[0062] In the chemical structural formula of the admixture, m and z are 10 respectively, and n is 50.

Embodiment 2

[0064] The admixture suitable for reducing the heat of hydration of mass concrete prepared in this example comprises 75 wt% of polyether monomer containing double bonds, 10 wt% of unsaturated carboxylic acid monomer, and 3 wt% of methallyl alcohol in parts by weight. %, 5-amino-1-hydroxymethyl-cyclohexyl-1,2,3,4-tetraol 12wt%;

[0065] In the chemical structural formula of the polyether monomer containing double bonds, R 1 and R 2 Each is an alkyl group of 5 carbon atoms; X is a methylene group; R 3 O is an alkoxy group of 5 carbon atoms, a=50, R 4 is an alkyl group of 2 carbon atoms;

[0066] In the chemical structural formula of the unsaturated carboxylic acid monomer, R 5 , R 6 , R 7 is methyl;

[0067] In the chemical structural formula of the admixture, m and z are 50 respectively, and n is 10.

Embodiment 3

[0069] The admixture suitable for reducing the heat of hydration of mass concrete prepared in this example includes 40 wt% of polyether monomer containing double bonds, 20 wt% of unsaturated carboxylic acid monomer, and 15 wt% of methallyl alcohol in parts by weight. %, 5-amino-1-hydroxymethyl-cyclohexyl-1,2,3,4-tetraol 25wt%;

[0070] In the chemical structural formula of the polyether monomer containing double bonds, R 1 and R 2 Respectively hydrogen atom or 4 carbon atoms of the alkyl group; X is a hydrogen atom; R 3 O is an alkoxy group of 3 carbon atoms, a=30, R 4 is a hydrogen atom;

[0071] In the chemical structural formula of the unsaturated carboxylic acid monomer, R 5 , R 6 , R 7 are hydrogen atoms;

[0072] In the chemical structural formula of the admixture, m and z are 20 respectively, and n is 30.

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Abstract

The invention discloses an admixture suitable for reducing hydration heat of mass concrete. The admixture comprises the following components in percentage by weight: 40-75wt% of a polyether monomer containing double bonds, 10-20wt% of an unsaturated carboxylic acid monomer, 3-15wt% of an unsaturated alcohol and derivative monomer thereof, and 12-25wt% of an amino alcohol derivative monomer. According to the admixture, the amino alcohol derivative monomer is combined with the other three raw materials, so that the problems of narrow phase change temperature range and limited heat absorption capacity of a single-component material are solved, the admixture meets the construction temperature control requirements of various mass concrete, the temperature rise is delayed, the temperature difference between the inner surface and the outer surface of a concrete structure is reduced, and the surface cracking phenomenon is reduced.

Description

technical field [0001] The invention belongs to the technical field of concrete building materials, in particular to an admixture suitable for reducing the heat of hydration of large-volume concrete. Background technique [0002] With the development and application of modern concrete, mass concrete structures have been widely used in various super high-rise buildings, long-span bridges and industrial buildings. The exothermic heat of cement hydration in the high-strength concrete component causes the internal temperature of the concrete to rise rapidly, and the temperature gradient formed between the inside and outside of the concrete is likely to generate a large temperature stress, resulting in the generation of temperature cracks. This phenomenon is especially significant in large-volume structures. In high temperature seasons, the temperature peak of mass concrete can even exceed 70°C. [0003] In order to solve the adverse effect of concrete hydration heat temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C08F283/06C08F220/06C08F216/08C08F216/04C08F216/14
CPCC04B40/0039C04B24/32C08F283/065C08F220/06C08F216/08C08F216/04C08F216/14C04B24/04C04B24/026C04B24/122C04B24/085
Inventor 李兴郑涛赵日煦高飞熊龙邢菊香
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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