What are the characteristics of high-performance water reducing agent?

2024-05-29

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 polycarboxylate-based series products. 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:

• 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.

• The concrete mixture has good workability and workability retention.

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

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

• Good adaptability to cement.

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

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

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.