Water reducing agent

Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After being added to the concrete mixture, it can disperse the cement particles, improve its workability, reduce the unit water consumption, and improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement.

Appearance forms are divided into water and powder. The solid content of water preparations is generally 20%, 40% (also known as mother liquor), and 60%, and the solid content of powder preparations is generally 98%.

According to the water reducing and strengthening ability of the water reducing agent, it is divided into ordinary water reducing agent (also known as plasticizer, water reducing rate is not less than 8%), high-efficiency water reducing agent (also known as superplasticizer, water reducing rate is not less than 14%) %) and high-performance water reducing agent (water reducing rate not less than 25%), and are divided into early strength type, standard type and retarded type.

According to the composition materials, it is divided into: (1) lignosulfonate; (2) polycyclic aromatic salt; (3) water-soluble resin sulfonate.

Ordinary water reducers are suitable for concrete where the daily minimum temperature is above 5°C. High-efficiency water-reducing agent is suitable for concrete construction with the daily minimum temperature above 0°C, and is suitable for the preparation of high-fluidity concrete, high-strength concrete and steam-cured concrete.