Compounding process of concrete hydration reducer

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...

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.

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