Alkaline-free anti-crack concrete shrinkage reducing agent

Abstract

The invention discloses an alkaline-free anti-crack concrete shrinkage reducing agent comprising the following components in percentage by weight: 35-66% of I-grade coal ash, 8-18% of polypropylene staple fiber, 2-18% of polyethylene glycol, 3-17% of methacrylic acid, 2-15% of calcium formate, 3-16% of neopentyl glycol and 0.2-0.8% of sodium dodecyl benzene sulfonate. The invention provides possibility for realizing the comprehensive improvement of an additive technology, reducing concrete shrinkage, inhibiting non-loaded cracks and improving the durability of concrete through the research on and application as a shrinkage reducing additive and creates the environment-friendly alkaline-free anti-crack concrete shrinkage reducing agent. The technology is simple in feeding way, easily-controlled in production condition, simple in process and capable of producing the alkaline-free anti-crack concrete shrinkage reducing agent which is low in alkaline content and mixing amount and capable of effectively controlling the shrinkage of concrete. The alkaline-free anti-crack concrete shrinkage reducing agent has a relatively good social benefit and a relatively high economic benefit.

Description

technical field [0001] The invention relates to an alkali-free anti-crack concrete shrinkage reducer. Background technique [0002] Concrete is the most widely used building material in contemporary construction projects. Concrete engineering technology is always advancing along with the needs of engineering construction and the development of science and technology. It has been widely used in industrial and civil construction, water conservancy, urban construction, agriculture and forestry, transportation and seaport and other projects. At the same time, many new problems will appear in the application process of concrete, especially in recent years, the durability degradation of concrete. Accidents of structural damage due to insufficient durability occur frequently, and the resulting economic losses are also incalculable. The biggest disadvantage of concrete is that it is prone to cracks. Cracks in concrete are not only an accident of engineering quality, but their exi...

AI Technical Summary

Problems solved by technology

These shrinkage reducing agents rarely consider the anti-cracking effect on concrete