Swinging in the field of national infrastructure construction is the most commonly used method. For example: rock
Using soil body reinforcement, dam anti -seepage, slope support and geological drilling projects must be used
The grouting material, and requires the following characteristics of grouting materials [1]: ① Good liquidity, benefit
Pumping and pumping. ② The condensation time is appropriate, and the time interval between the beginning and ending is short, which is conducive to efficiency rate. ③ Early intensity and continuous growth. Currently commonly used ordinary silicate cement irrigation. The slurry material generally has the weakness of the condensation time, low strength, and low stones rate. One modifications must be performed in use to meet the quality requirements of the project. Sulfate aluminum cement is generally used in fast rescue projects, which is characterized by condensation time fast, early intensity is high. For the grouting project, the biggest problem is that the liquidity is not good and condensed time is too fast. How to effectively use ordinary silicate cement and sulfate cement cement
The advantages of their respective advantages are better for the grouting engineering, which is a new topic for the current research of grouting materials.
At present, there are already studies mainly to stay simply to cooperate with two kinds of cement.
It is used for research on grouting materials. This article starts from the performance of grouting materials, right
The grouting characteristics of ordinary silica cement and sulfate and sulfate cement are studied.
And supplemented with the additional dosage modification, obtained a reclaimed modification scheme that meets the grouting requirements, which can be promotion and application in actual engineering.

Polycarboxylic acid water-reducing agent is a high-performance concrete admixture. The following is a detailed introduction to it:

1. Definition and Overview
Polycarboxylate Superplasticizer is a variety of polymer organic compounds with polycarboxylate as the main body, which is produced through graft copolymerization. It is one of the most technologically advanced environmentally friendly concrete admixtures in the world today and has extremely strong water-reducing properties.

2. Performance characteristics
High water reduction rate: High polycarboxylic acid water reducing agent has a high water reduction rate, usually as high as 40%, which makes it excellent in the preparation process of high-performance concrete.
Low dosage: Due to its efficient water-reducing performance, its dosage is relatively low, which is beneficial to cost control and performance optimization.
Good slump retention performance: It can effectively prevent concrete slump loss and maintain the working performance of concrete.
Low concrete shrinkage: Helps reduce concrete shrinkage and improves the stability and durability of the structure.
The molecular structure is highly tunable: By changing different functional groups, adjusting the length of the main and side chains, the density of the main and side chains, etc., it can be functionally designed to meet different engineering needs.
Green and environmentally friendly: This water-reducing agent is environmentally friendly, non-flammable and non-explosive, and can be safely transported by trains and cars.
3. Application fields
Large-scale projects such as highways, bridges, and tunnels: In these projects, the use of high-polycarboxylate water-reducing agents can greatly improve the strength and durability of concrete and extend the service life of the project.
House construction engineering: It can improve the fluidity, workability and strength of concrete after hardening, and improve the quality and safety of houses.
Water conservancy projects: Improve the impermeability and durability of concrete, and enhance the stability and safety of water conservancy facilities.
Port engineering: improve the strength and durability of concrete and enhance the stability and safety of docks.
4. Synthesis method
The synthesis methods of high polycarboxylic acid water-reducing agents mainly include in-situ polymerization grafting method, polymerization first and then functionalization method, and direct copolymerization of monomers. Among them, the direct copolymerization of monomers has become the most commonly used synthesis method at this stage because of its simple operation and stable product quality.

5. Summary
Polycarboxylic acid superplasticizer plays an important role in concrete engineering due to its advantages of high water reduction rate, low dosage, good slump retention performance, low concrete shrinkage, strong adjustability of molecular structure and environmental protection. With the continuous development of science and technology, its performance and application fields are also constantly expanding.