▎ 摘　　要

NOVELTY - Graphene-modified concrete retarder comprises 10-40 pts. wt. graphene, 5-35 pts. wt. EDTA salt, 10-30 pts. wt. formate, 10-35 pts. wt. calcium bromide and 10-20 pts. wt. urea. USE - Used as graphene-modified concrete retarder. ADVANTAGE - The graphene-modified concrete retarder: delays the condensing time of the concrete; improves the growth rate of the concrete strength; and improves the strength of concrete at all ages. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the graphene-modified concrete retarder, comprising (i) mixing EDTA salt and graphene evenly, adding water, stirring and dispersing ultrasonically to obtain mixture, and (ii) mixing the obtained mixture with calcium bromide, urea and formate to obtain graphene-modified concrete retarder.