A composite concrete air-entraining agent, its preparation method and its application

Abstract

The invention provides a composite concrete air-entraining agent, its preparation method and its application, characterized in that: the composite concrete air-entraining agent consists of sulfonate type gemini surfactant, betaine type amphoteric surfactant, alkane Alcohol amide type non-ionic surfactant and water; the solid content of the composite concrete air-entraining agent is 20±1%. The composite concrete air-entraining agent of the present invention has an excellent air-entraining effect in concrete, introduces a sufficient amount of 20-150 μm stable micro-bubbles, improves the workability of concrete (mortar), reduces bleeding rate and settlement, and While increasing the air content, it does not reduce the later strength of concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a composite concrete air-entraining agent capable of significantly improving the durability of concrete and a preparation method thereof. Background technique [0002] The freeze-thaw damage and salt freeze damage of concrete buildings and various structures, roads and marine engineering have always been the focus of people's attention. Studies have shown that adding an appropriate amount of air-entraining agent in the concrete preparation process, introducing and retaining an appropriate amount of air bubbles with small sizes and reasonable structures in the concrete is the most important measure to greatly improve the freeze-thaw cycle resistance of concrete and increase the durability index. [0003] The commonly used chemical air-entraining agents in the field of concrete mainly include modified rosin sulfonate, alkyl sulfonate, alkyl polyoxyethylene et...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the special environment of high salinity and high alkali inside the concrete, but the air-entraining effect of the existing air-entraining agent is average, and the amount of micro-bubbles is insufficient, so the addition of the air-entraining agent will affect the strength of the concrete. The invention provides a composite Type concrete air-entraining agent and preparation method thereof

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