A kind of preparation method of starch-based hydration heat regulating material

Abstract

The present invention provides a starch-based hydration heat regulation material preparation method, which comprises: 1, preparing enzymolysis dextrin: adding water to corn starch, blending into starch milk, placing the corn milk in a boiling water bath, heating to achieve a completely pasting state, cooling to a room temperature, adjusting the pH value to 5.5-6.5, adding isoamylase and beta-amylase, carrying out a hydrolysis reaction, adjusting the pH value to less than or equal to 3.0 after completing the reaction, inactivating the enzyme, adjusting the pH value to a neutral pH value, cooling to a room temperature, adding ethanol to the reaction solution, stirring, filtering, drying the filtrate, and crushing so as to obtain the enzymolysis dextrin; and 2, preparing the starch-based hydration heat regulation material: adding water to the enzymolysis dextrin prepared in the step 1, blending into a dextrin solution, adding an emulsifier, carrying out an emulsifying reaction, filtering, drying the solid, and crushing so as to obtain the finished product. According to the present invention, the method has characteristics of simple process and low cost, and the prepared hydration heat regulation material has characteristics of stable performance, effective reduction of the cement hydration heat release rate peak value, and substantial no influence on the medium-late stage strength of concrete.

Description

technical field [0001] The invention belongs to the field of concrete admixtures for building materials, and in particular relates to a preparation method of a starch-based hydration heat regulating material. Background technique [0002] Cement will release a lot of heat during the hydration process, and the heat release is mainly concentrated in the first seven days after pouring. Due to the poor thermal conductivity of concrete, the exothermic heat of hydration accumulates inside the concrete and cannot be dissipated in time, which will form internal and external temperature differences and temperature stress. Once the temperature stress exceeds the ultimate tensile strength that the concrete can withstand, temperature cracks will occur. As time goes on, the cracks will continue to expand, which will affect the safety and durability of the concrete. For large-volume concrete, this phenomenon is more serious, and sometimes the temperature difference between the inside and...

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Problems solved by technology

However, the patent does not specify the type and properties of the modified starch, resulting in uncertain practicability

[0007] Since dextrin is a product obtained by starch hydrolysis and has a wide molecular weight distribution, there are large differences in the structure and properties of dextrin obtained from different raw materials and different preparation processes, which in turn will have a greater impact on the inhibitory effect on the heat of hydration of cement. However, the current research on the effect of dextrin on the cement hydration process is still very lacking.

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