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 8to 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 isreduced 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 present invention involves the field of concrete, which specifically involves a concrete composite exterior. Background technique [0002] Under normal conditions, thermal hydrophochemical in ordinary silicate can reach half of the heat value in 1 ~ 2D, which is called hydrophilic heat semi -age period.The water reduction with a water -reducing agent, especially the mitigating performance, can change the hydrophilization curve of the cement, causing the hydrophilic heating semi -aging period to change. [0003] At present, the existing concrete outer agent technology focuses on the intensity, working nature of the concrete, and the time of the initial and final condensation by adding an outer agent.The thermal curve needs to be improved. Invention content [0004] The purpose of the present invention is to overcome the shortcomings of existing technologies, provide a concrete composite exterior agent that optimizes the hydrophilization process of large...

AI Technical Summary

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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