The role of waterproofing agents in grouting materials. Inventory of the four major types of waterproofing agents

I believe that many people have heard of waterproofing agents. However, I believe many people are not very clear about the real role of waterproofing agents in grouting materials. The following is mainly for everyone Let’s introduce the role of waterproofing agent in grouting materials.

The role of waterproofing agent in grouting materials

1. Water-reducing agent waterproofing mechanism

Water-reducing agent has a strong dispersing effect on cement. With the help of polar adsorption effect, it greatly reduces the attraction between cement particles and effectively hinders and destroys cement particles. It improves the flocculation effect between particles and releases the water in the floc, thereby reducing the water consumption of the grouting material, improving the workability of the grouting material, improving the distribution of the pore structure after hardening, and improving the homogeneity and impermeability of the grouting material. progress.

2. Waterproof mechanism of air-entraining agent

Air-entraining agent is a hydrophobic epoxy The surface-active substances used in resin mortar grouting materials can significantly reduce the surface strength of the grouting material mixture. After mixing, many fine, airtight, and disconnected bubbles can be produced in the grouting material mixture, making the capillary tubes become small, tortuous, and Dispersed, reducing water seepage channels. Air-entraining agents can also increase viscosity, improve workability, reduce settlement, bleeding and stratification, make up for structural defects of grouting materials, thereby improving the compactness and impermeability of grouting materials.

3. Triethanolamine waterproofing mechanism

Triethanolamine is an agitator for cement hydration , so that the cement generates more hydration products in the early stage of hydration, and part of the free water combines into crystal water, which correspondingly reduces the capillary channels and pores, thus improving the impermeability of the grouting material.

4. Waterproofing mechanism of swelling agent

Reaction of swelling agent with cement hydration products , generate crystals with increased volume, fill and plug the pores, and produce a certain volume expansion, compensate for the shrinkage of the grouting material, improve the crack resistance of the grouting material, and thereby improve the waterproofing ability of the grouting material.

Organic waterproofing agent is mainly a surfactant or compound with a hydrophobic effect. Through the hydrophobic effect, the grouting material can prevent the column reinforcement grouting material from cracking.

Each component in the composite waterproofing agent works together and has complementary advantages, which greatly improves the impermeability and waterproofing capabilities of the grouting material. </p