General provisions for retarders and retarding water-reducing admixtures

① in concrete projects, the following retardants or retarding water reducing agents can be used, sugars, lignosulfonates, hydroxycarboxylic acids and their salts, inorganic salts and other amine salts. ② retarder and retarding water-reducing agent can be used for large-volume concrete, concrete constructed in hot climate conditions, and concrete that needs to be parked for a…