According to the definition of the national standard "Concrete Admixtures", high-performance water-reducing admixture refers to a higher water-reducing rate, better slump retention performance, less drying shrinkage than high-efficiency water-reducing admixtures, and has For water-reducing agents with certain air-entraining properties, the water-reducing rate should be no less than 25%.

High-performance water-reducing admixture is a new type of admixture developed in recent years. It is mainly a polycarboxylate product. It has a "comb-like" structural feature, with a main chain with free carboxylic acid anion groups and a polycarboxylate-based product. Composed of oxyethylene side chains, high-performance superplasticizers with various properties and characteristics can be produced by changing the type, proportion, and reaction conditions of monomers. Early-strength, standard, and retardant high-performance water-reducing admixtures can be produced by introducing different functional groups through molecular design or can be compounded by incorporating different components.

High-performance water-reducing agent has stronger performance than ordinary/high-efficiency water-reducing agent. Its main features are:

1. The dosage is low (calculated based on solid content, generally 0.15%~0.25% of the mass of the cementitious material) and the water reduction rate is high.

2. The concrete mixture has good workability and workability retention.

3. The content of chloride ions and alkali in the admixture is low.

4. The shrinkage rate of concrete prepared with it is small, which can improve the volume stability and durability of concrete.

5. Good adaptability to cement.

6. The production and use process does not pollute the environment and is an environmentally friendly water-reducing agent.

7. It greatly improves the performance of concrete and can greatly improve the durability, mechanical properties and dimensional stability of concrete.

High-performance water-reducing agents are mainly used to prepare low water-cement ratio, high-strength, self-compacting and high-durability concrete. They are the main development direction of concrete water-reducing agents.