Composite additive for concrete

Abstract

The invention discloses a concrete composite admixture, which comprises the following components (mass percentage): 25-40% of β-naphthalene sulfonate, 0.5-1.5% of white sugar, 5-15% of aluminum sulfate, ethylene vinyl acetate 0.1~0.4%, the rest is water. The pH value of the concrete composite admixture is 3-4, the solid content is 26-40%, and the added amount is 2-4% of the cement weight. After strict testing of the samples, all the indicators are in line with the technical requirements of JC474-1999 first-class products, can be widely used in ordinary concrete and high-performance concrete, and can significantly improve the micro-expansion account, shrinkage reduction, water reduction and retardation of concrete and other performance.

Description

technical field [0001] The invention relates to a building material admixture, in particular to a composite admixture for concrete. Background technique [0002] In the preparation process of concrete, mortar and clean slurry, a small amount (no more than 5% of the amount of cement) is added to a product that can change the performance of concrete, mortar or clean slurry, called concrete admixture. Adding an appropriate amount of admixtures to concrete can improve the quality of concrete, improve concrete performance, reduce concrete water consumption, save cement, reduce costs, and speed up construction progress. With the advancement of technology, admixtures have become the fifth necessary material besides cement, coarse and fine aggregates, admixtures and water. Adding admixtures is an important measure to optimize the design of concrete mix ratio and improve the durability of concrete. . Therefore, the newly revised "Code for Construction of Hydraulic Concrete" (DL / T51...

AI Technical Summary

Problems solved by technology

[0010] Traditional concrete admixtures often only have a single function, such as waterproofing agent, which can only improve the waterproof function of concrete, and to prolong the setting time of concrete, it is necessary to add retarder

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