Water reducing agent added to the concrete mix after the cement particles have a dispersing effect, can improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mix; reduce the unit of cement dosage, save cement.

Water reducing agent belongs to anionic surfactants, lignin sulfonate, naphthalene sulfonate formaldehyde polymers. Appearance form is divided into water and powder. According to the water reducing agent and enhance the ability to reduce water, divided into ordinary water reducing agent, high-efficiency water reducing agent and high-performance water reducing agent, and were divided into early-strength type, standard type and slow-setting type.