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Compounding process of concrete hydration reducer

A preparation method and heat of hydration technology, applied in the field of concrete admixtures, can solve problems such as complex control process, reduction of cement hydration heat, and limited temperature reduction

Inactive Publication Date: 2008-07-30
CCCC SECOND HARBOR ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature control measures are still relatively backward, the control process is also more complicated, and the cost is higher
The purpose of reducing cement hydration heat can also be achieved by mixing water reducing agent, but the reduction temperature is limited.
However, there is no report in China that the hydration heat temperature peak of cement can be lowered by more than 10°C by adding admixtures.

Method used

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  • Compounding process of concrete hydration reducer
  • Compounding process of concrete hydration reducer
  • Compounding process of concrete hydration reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] A raw material selected from polyacrylic acid-starch graft, polyglycolic acid-lactic acid copolymer, modified starch, polyformamide, polymethyl methacrylate, polyacrylonitrile alkyl ester and ethyl cellulose Dissolve in water; react at 5-55°C, separate the reacted water phase from the solid phase, and the separated solid phase is the concrete hydration heat reducer; dry the separated solid phase; pulverize, the fineness is less than 0.315 mm. The one selected from polyacrylic acid-starch graft, polyglycolic acid-lactic acid copolymer, modified starch, polyformamide, polymethyl methacrylate, polyacrylonitrile alkyl ester and ethyl cellulose The molar ratio of raw materials and water is: 1:1-50.

Embodiment 2

[0010] A raw material selected from polyacrylic acid-starch graft, polyglycolic acid-lactic acid copolymer, modified starch, polyformamide, polymethyl methacrylate, polyacrylonitrile alkyl ester and ethyl cellulose Dissolve in water; react at 10-50°C, separate the reacted water phase and solid phase, and the separated solid phase is the concrete hydration heat reducer; dry the separated solid phase; pulverize, the fineness is less than 0.315 mm. The selected from polyacrylic acid-starch graft, polyglycolic acid-lactic acid copolymer, modified starch, polyglycolic acid-lactic acid copolymer, polyformamide, polymethyl methacrylate, polyacrylonitrile alkyl ester and The molar ratio of a raw material in ethyl cellulose to water is: 1:5-40.

Embodiment 3

[0012] A raw material selected from polyacrylic acid-starch graft, polyglycolic acid-lactic acid copolymer, modified starch, polyformamide, polymethyl methacrylate, polyacrylonitrile alkyl ester and ethyl cellulose Dissolve in water; react at 15-40°C, separate the reacted water phase and solid phase, and the separated solid phase is the concrete hydration heat reducer; dry the separated solid phase; pulverize, the fineness is less than 0.315 mm. The selected from polyacrylic acid-starch graft, polyglycolic acid-lactic acid copolymer, modified starch, polyglycolic acid-lactic acid copolymer, polyformamide, polymethyl methacrylate, polyacrylonitrile alkyl ester and The molar ratio of a raw material in ethyl cellulose to water is: 1:8-35.

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Abstract

The concrete hydration heat reducer is compounded with one kind of material selected from starch grafted polyacrylate, hydroxyl acetic acid-lactic acid copolymer, modified starch, polymethylamide, polymethyl formacrylate, polyalkyl acrylonitrile and ethyl cellulose, and through dissolving in water, reaction at 5-55 deg.c, water phase-solid phase separation after reaction to obtain the solid phase concrete hydration heat reducer. The material has molar ratio to water of 1 to 1-50. The product can reduce hydration heat of cement obviously, reduce the early adiabatic temperature raise of concrete, reduce temperature raise rate to lag the peak temperature time by about 6 days, make the concrete possess excellent heat stability, less initial stage temperature stress and less cracks.

Description

technical field [0001] The invention belongs to a concrete admixture, and in particular relates to a concrete admixture capable of reducing the heat of hydration of concrete by more than 10°C in large-volume concrete construction such as bridges, dams, ports, and industrial and civil construction. Background technique [0002] In civil engineering such as port engineering, bridge engineering, and dams, some reinforced concrete structures have large dimensions. Due to the large size of the structure, the temperature rise of the concrete caused by the heat of cement hydration is not easy to dissipate, resulting in a large difference in internal and external temperature. Large temperature changes and differences cause volume changes in the concrete, which, under restraint, can lead to cracks in the concrete. If certain cooling measures are not taken, the concrete is easy to crack, affecting the durability of the structure, and bringing extremely serious harm to the entire proj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24
Inventor 雷宇芳刘秉京徐长生
Owner CCCC SECOND HARBOR ENG