▎ 摘　　要

NOVELTY - This invention discloses a betaine-containing copolymer-PSA as a dispersing agent for graphene oxide in cementitious materials. PSA has the following chemical structure: Wherein x is an integer ranging from 10 to 5000, y or z is an integer ranging from 0 to 5000, 10 y+z 5000. R1 is H, NH4 or alkaline metal element. PSA could make graphene oxide(GO) powder to be less aggregated in pore solutions. Addition of PSA in cement pastes, mortars, or concrete could improve the compressive strength and flexural strength of the resulting cement-based materials. Therefore, PSA polymer is a good dispersant for dispersing GO powder in cement-based materials.