Self-curing cement-based material solid air-entraining agent and its preparation method and application

Abstract

Self-curing solid air-entraining agent for cement-based materials and its preparation method and application. The invention belongs to the field of building materials. It solves the problem that the existing cement-based composite materials have a weak ability to resist freeze-thaw cycle damage, and the cement-based materials are dehydrated due to water loss. And there is a problem of shrinkage. The solid air-entraining agent for self-curing cement-based materials of the present invention is composed of 1% to 20% of a polymer water-absorbing resin and 80% to 99% of a water-repellent treatment agent, wherein the polymer water-absorbing resin is Polyacrylate polymer water-absorbing resin, polyamide-based polymer water-absorbing resin or a mixture of the two resins, and the hydrophobic treatment agent is saturated sodium stearate solution or water-soluble organic silicon solution. The self-curing solid air-entraining agent of the invention forms evenly distributed approximately spherical pores with a diameter of less than 300 μm in the cement-based composite material, improves the frost resistance of the cement-based composite material, and has a self-curing function at the same time.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a cement-based composite material solid air-entraining agent with self-maintenance function and its preparation method and application. Background technique [0002] Freeze-thaw cycle damage is a common damage form of cement-based composites, and frost resistance is the main and important performance of cement-based composites. Although they cannot fully explain all damage phenomena, the hydrostatic pressure theory and osmotic pressure theory are currently generally accepted damage mechanisms of freeze-thaw cycles. Artificially introducing spherical micropores in cement-based composites can be used as a space to release hydrostatic pressure and osmotic pressure, which is the most effective way to improve frost resistance. For example, chemical air-entraining agents are added during the mixing process of cement concrete, and their surface activity is used to reduce t...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing cement-based composite materials have weak resistance to freeze-thaw cycle damage, and the shrinkage of cement-based materials due to dehydration, and provide a self-curing solid air-entraining agent for cement-based materials And its preparation method and application

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