A durable concrete waterproofing agent

Abstract

The invention discloses a high-durability concrete waterproofing agent which comprises the following components in percentage by weight: 3-11% of alum, 3-12% of copper sulfate, 15-29% of fly ash, 7-22% of polycarboxylic acid water reducing agent, 20-38% of expanding agent, 0.03-0.7% of air entraining agent, 0-0.5% of alkyl sodium sulfonate and 8-26% of silica fume. The waterproofing agent can reduce the porosity, promote the hydration of the cement, enhance the density of the concrete, reduce the shrinkage of the concrete and improve the comprehensive durability of the concrete.

Description

technical field [0001] The invention relates to a durable concrete waterproofing agent. Background technique [0002] Waterproofing is an important measure, even a fundamental measure, to improve the durability of cement concrete structures. The waterproof performance of cement concrete structure basically determines its durability. Hardened cement concrete, according to the traditional point of view, is a dense substance, but in fact, according to a large number of current research results, under the requirements of 50 or even 100 years of use, ordinary cement concrete is not only not good for water. Dense and permeable. Water is an important substance that causes durability damage to cement concrete structures and reinforced concrete structures. Whether it is soft water erosion of cement concrete, freeze-thaw damage, alkali-aggregate reaction, steel bar corrosion and sulfate corrosion, etc., or steel bar oxidation corrosion in cement concrete, or even the dissolution o...

AI Technical Summary

Problems solved by technology

Practice has proved that most waterproofing agents can improve the impermeability of stick concrete, but the first three methods are in the actual application process. There is often a phenomenon of concrete shrinkage and cracking that causes leakage

Although the fourth method can avoid the shrinkage and cracking of concrete, it is expected that the amount of common expansion agent will be large.

cause waterproof failure