Concrete composite additive and preparation method and use thereof

Abstract

The invention relates to a concrete additive and discloses a concrete composite additive capable of optimizing a hydration heat release process of cement, which is prepared from the following raw materials in percentage by mass: 65 to 75 percent of naphthalene sulfonate-formaldehyde condensation product, 9 to 15 percent of lignosulfonic acid calcium salt, 8 to 10 percent of sodium gluconate and 8 to 10 percent of sucrose. When the additive is used, the hydration heat release of cement has the characteristic of two peaks and equal peak values. When other conditions are the same, the hydration heat half age of the cement mixed with the additive is three times longer than cement mixed with a naphthalene sulfonate water reducer and a concrete thermal-insulation temperature rise at a 7d age is reduced by about 7 DEG C; and the additive allows a cooling measure of introducing water to concrete to play a better cooling role, reduces the temperature rise peak value of the concrete by about 4 DEG C, ensures a remarkable cooling effect and has a great significance for the temperature control and cracking prevention of concrete. In addition, when the product provided by the invention is added, the pressure strength, working performance, durability and the like of concrete are all improved obviously.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a concrete composite admixture. Background technique [0002] Under normal conditions, the hydration heat of ordinary silicate mesothermal cement can reach half of the final value within 1-2 days, which is called the half-value age of heat of hydration. The incorporation of superplasticizers, especially those with retarding properties, can change the exothermic curve of cement hydration and change the half-value age of heat of hydration. [0003] At present, the existing concrete admixture technology focuses on improving the strength, workability, and initial and final setting times of concrete by adding admixtures. The hydration heat release curve of the existing admixtures is basically a single peak, and the hydration release Thermal curves could be improved. Contents of the invention [0004] The purpose of the present invention is to overcome the shortcoming of prior art, provide ...

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Problems solved by technology

[0003] At present, the existing concrete admixture technology focuses on improving the strength, workability, and initial and final setting times of concrete by adding admixtures. The hydration heat release curve of the existing admixtures is basically a single peak, and the hydration release Thermal curve could be improved

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