Concrete admixtures are classified according to chemical composition

(1) Inorganic admixtures: including various inorganic salts, some metal elements and a small amount of hydroxides. Such as calcium chloride and sodium sulfate in early strength agents, aluminum powder in air-entraining agents, sodium hydroxide in waterproofing agents, etc. (2) Organic admixtures: This type of admixtures account for the vast majority of concrete admixtures. There are…