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

A cement-based material and air-entraining agent technology, applied in the field of building materials, can solve the problems of weak resistance to freeze-thaw cycle damage, shrinkage of cement-based materials, etc., achieve great advantages, reduce the risk of cracking, and improve cement hydration degree of effect

Active Publication Date: 2021-12-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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specific Embodiment approach 1

[0016] Specific Embodiment 1: In this embodiment, the solid air-entraining agent for self-curing cement-based materials is composed of 1% to 20% of polymer water-absorbing resin and 80% to 99% of water-repellent treatment agent according to the mass percentage, wherein the The polymeric water-absorbing resin is polyacrylate polymeric water-absorbing resin, polyamide-based polymeric 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.

[0017] The solid air-entraining agent with self-curing function in this embodiment is composed of two components: a polymer water-absorbing resin component and a hydrophobic component.

specific Embodiment approach 2

[0018] Embodiment 2: This embodiment differs from Embodiment 1 in that the water absorption rate of the polymer water-absorbent resin is (10-1000) g / g.

specific Embodiment approach 3

[0019] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the average diameter of the dry polymer water-absorbing resin particles is 30 μm to 200 μm.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B24/28C04B24/26C04B103/30
CPCC04B40/0039C04B2103/304C04B24/085C04B24/2641C04B24/42
Inventor 杨文萃蔡小平葛勇赵慧
Owner HARBIN INST OF TECH
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