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A kind of admixture suitable for reducing hydration heat of mass concrete and preparation method thereof

A large-volume concrete and admixture technology, applied in the field of concrete building materials, can solve the problems of narrow phase transition temperature range, single phase transition system, and limited application environment range of hydration heat materials, so as to improve water reduction effect and phase transition volume Minimal change, reduced surface cracking effect

Active Publication Date: 2022-07-01
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of admixture suitable for reducing hydration heat of mass concrete and preparation method thereof
  • A kind of admixture suitable for reducing hydration heat of mass concrete and preparation method thereof
  • A kind of 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 hydration heat of large-volume concrete prepared in this example comprises, in parts by weight, 60% by weight of double bond-containing polyether monomer, 15% by weight of unsaturated carboxylic acid monomer, and 3% by weight of propylene glycol , trimethylolaminomethane 18wt%;

[0060] In the chemical structural formula of the double bond-containing polyether monomer, R 1 is a hydrogen atom, R 2 is methyl; X is an alkyl group of 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 a carboxyl group, R 7 is methyl;

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

Embodiment 2

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

[0065] In the chemical structural formula of the double bond-containing polyether monomer, 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 respectively 50, and n is 10.

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Abstract

The invention discloses an admixture suitable for reducing the hydration heat of large-volume concrete, comprising 40-75wt% of double bond-containing polyether monomer, 10-20wt% of unsaturated carboxylic acid monomer, unsaturated alcohol by weight percentage and its derivative monomers 3-15wt%, aminoalcohol derivative monomers 12-25wt%. By combining amino alcohol derivative monomers with three other raw materials, the admixture solves the problems of narrow phase transition temperature and limited heat absorption capacity of single-component materials, adapts to the construction temperature control requirements of various types of mass concrete, delays The temperature rise rate can reduce the temperature difference between the inside and outside of the concrete structure and reduce the surface cracking phenomenon.

Description

technical field [0001] The invention belongs to the technical field of concrete building materials, in particular to an admixture suitable for reducing the hydration heat of large-volume concrete. Background technique [0002] With the development and application of modern concrete, mass concrete structures have been widely used in various types of super high-rise buildings, long-span bridges and industrial buildings. The hydration and heat release of cement in high-strength concrete components 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 large temperature stress, resulting in the generation of temperature cracks. This phenomenon is particularly significant in large-volume structures. In high temperature season, the temperature peak of mass concrete can even exceed 70℃. [0003] In order to solve the adverse effect of concrete hydration heat temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C04B24/32C08F220/06C08F216/08C08F216/04C08F216/14
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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