Composite concrete air entraining agent, and preparation method and application thereof

Abstract

The invention provides a composite concrete air entraining agent, and a preparation method and application thereof. The invention is characterized in that the composite concrete air entraining agent is composed of a sulfonate Gemini surfactant, a betaine amphoteric surfactant, an alkanolamide nonionic surfactant and water; and the solid content of the composite concrete air entraining agent is 20+ / -1%. The composite concrete air entraining agent has excellent air-entraining effect in concrete; and sufficient 20-150-mu m stable small bubbles can be introduced to improve the workability of the concrete (mortar), reduce the bleeding rate and sedimentation and avoid lowering the later strength of the concrete on the premise of enhancing the air content.

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...

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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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