Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material

Abstract

The invention provides a cement hydration rate regulating material which is dextrin grafted with a water-soluble polymer. The cement hydration rate regulating material is simple in preparation process and low in cost; the cement hydration rate regulating performance of the cement hydration rate regulating material is greatly improved as comparison with that of the prior art; and the peak value of the maximum heat release rate for cement hydration can be reduced by more than 80%.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a cement hydration rate control material and a preparation method and application thereof. Background technique [0002] Cement hydration will release a lot of heat. When the heat released by cement hydration in concrete is too late to dissipate, the internal temperature of concrete will rise, and when the hydration stops later, the concrete temperature will drop to ambient temperature; this temperature The change will cause the volume of concrete to change. Under constrained conditions, when the tensile stress formed by temperature deformation exceeds the tensile strength of concrete, it will lead to the formation of temperature cracks. In order to reduce temperature cracks, the temperature rise of concrete must be reduced. Therefore, it is necessary to regulate the hydration process of cement and reduce the hydration rate of cement during the acceleration period a...

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Problems solved by technology

[0005] Patent CN201410009447 discloses a medium-heat Portland cement hydration process control material, which is composed of dextrin, modified dextrin and oleic acid. The published results show that the optimal ratio can reduce the peak rate of cement hydration by 66.3 %, but its preparation is also more complicated

[0006] Patent JP4905977B2 discloses that although dextrin has a certain effect of inhibiting the heat of hydration, it greatly prolongs the coagulation time and reduces the strength

[0007] In summary, although the existing patent literature mentions that dextrin has a certain hydration rate regulation function, dextrin is an intermediate product of starch hydrolysis, and there are many types. Not all dextrins have excellent hydration regulation function. Moreover, the hydration control performance in the published results is still limited.

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