▎ 摘　　要

NOVELTY - Preparing graphene-nanosheets based concrete additive comprises: (a) mixing polycarboxylate ether-A (PCE-A) to a retarder-based salt solution to obtain a retarder based polycarboxylate ether-A (PCE-A) solution; (b) adding polycarboxylate ether-B (PCE-B) to the retarder based polycarboxylate ether-A solution to obtain a retarder based polycarboxylate ether (PCE) solution; (c) mixing graphene nanosheets to the retarder based PCE solution to obtain graphene nanosheets based PCE solution; and (d) adding at least one air entrainment agent to the graphene nanosheets based PCE solution obtained at step (c) to obtain the graphene nanosheets based concrete additive. USE - The method is useful for preparing graphene-nanosheets based concrete additive, which is used for concrete. The graphene-nanosheets-based concrete additive is useful in cementing material, and sand and stone as aggregate. ADVANTAGE - The method provides graphene-nanosheets based concrete additive with improved compressive strength and flexural strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for additive for concrete. DESCRIPTION OF DRAWING(S) - The figure shows a method flowchart to prepare the graphene nanosheets based concrete additive. 102Mix at least one retarder with water 104Add polycarboxylate ether-A to a retarder salt solution 106Add polycarboxylate ether-B to a retarder based PCE-A solution 108Mix graphene nanosheets to a retarder based PCE solution 110Add an air entrainment agent to graphene nanosheets based PCE solution