▎ 摘　　要

NOVELTY - A micro-nanocrystalline core composite material comprises graphene oxide and/or chemically grafted modified graphene oxide, hydrated calcium silicate, and high molecular polymer. USE - Micro-nanocrystalline core composite material in cement-based material (all claimed) for concrete. ADVANTAGE - The composite material has high dispersibility, which not only promotes the hydration of cement-based materials, and provides excellent early strength and durability to concrete. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the micro-nanocrystalline core composite material, which involves preparing graphene oxide and/or chemically grafted graphene oxide dispersion, adding calcium nitrate solution and/or calcium chloride solution, sodium silicate solution and polymer to dispersion liquid and ultrasonically dispersing.