High-performance water reducing agents are mainly divided into three types: slump-preserving type, functional type and shrinkage-reducing type. These types are briefly described below.

1. Collapse-preserving type. Slump-preserving water-reducing agents are generally used in the development of concrete. By adding this type of water-reducing agent, the slump of concrete can be ensured and the fluidity of concrete can be reasonably controlled.
2. Functional type. The functional type of water reducing agent is mainly divided into two functions, one is the early strengthening type and the other is the retarding type. Among them, the early-strength type water-reducing agent can enable the concrete to meet the heat release requirements in the early stage and promote the condensation of concrete, which is beneficial to concrete construction in winter. However, the application of retardant water-reducing admixture in concrete mainly reflects the ability to maintain the condition of the concrete to facilitate later concrete construction and repair. However, if these two water reducing agents are used together, they can play the role of cement retardant.
3. Reduced type. The shrinkage-reducing type of water-reducing agent is mainly synthesized through esterification reaction. It not only has a certain water-reducing effect and shrinkage-reducing function, but also can fully exert the effect of concrete water-reducing.