▎ 摘　　要

NOVELTY - Concrete retarder comprises 10-15 pts. wt. sugar, 15-30 pts. wt. phosphate, 1-3 pts. wt. graphene, 5-10 pts. wt. stearic acid, 5-10 pts. wt. water reducing agent, 0.5-1.5 pts. wt. dispersant, 0.5-1.5 pts. wt. surfactant and 50-80 pts. wt. water. The sugar is chitosan, sucrose, glucose and/or threose. The phosphate is sodium tripolyphosphate, disodium hydrogen phosphate, sodium phosphate, and/or ammonium phosphate. The water reducer is corn starch water reducer. The dispersant is sodium lignin sulfonate. The surfactant is cation surfactant i.e. cation surfactant benzalkonium bromide. USE - Used as concrete retarder. ADVANTAGE - The concrete retarder is suitable as destone agent and has good retarding effect on concrete and quickly increases the early strength of concrete. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the concrete retarder.