▎ 摘　　要

NOVELTY - Making a graphene/graphite oxide mixed with other hydrophilic powders, comprises (a) obtaining graphene/graphite oxide flakes with a surface area to thickness ratio of greater than 300 Angstrom and thickness of less than 160 Angstrom , where the flakes have no significant physical surface distortions, no significant epoxy functionalization, and has an oxidation level of greater than 1.5 mass%, (b) combining with ordinary Portland cement and other dry powders, (c) mixing for at least 30 minutes in a sonic mixing system, and (d) adding water to react the powders and form a cementitious composite when cured. USE - The method is useful for making a graphene/graphite oxide which is useful for making a cement, and a graphene/graphite cement composite (all claimed). ADVANTAGE - The method provides high quality graphene/graphite oxides which have minimal surface oxidation or minimal epoxy group, and exhibit enhanced mechanical, electrical or thermal physical properties. DETAILED DESCRIPTION - Making a graphene/graphite oxide mixed with other hydrophilic powders, comprises either: (a) obtaining graphene/graphite oxide flakes with a surface area to thickness ratio of greater than 300 Angstrom and thickness of less than 160 Angstrom , where the graphene flakes have no significant physical surface distortions, no significant epoxy functionalization, and has an oxidation level of greater than 1.5 mass%, (b) combining with ordinary Portland cement and other dry powders, (c) mixing for at least 30 minutes in a sonic mixing system, and (d) adding water to react the powders and form a cementitious composite when cured; or the step (a), combining with sand and other dry powders, and mixing for at least 30 minutes in a sonic mixing system. INDEPENDENT CLAIMS are also included for: (1) a graphene/graphite oxide preparation for making a cement comprising graphene/graphite oxide flakes combined with ordinary Portland cement and other dry powders, where the mixture is capable of forming a cementitious composite when cured in the presence of water; and (2) a graphene/graphite cement composite comprising graphene/graphite oxide flakes combined with ordinary Portland cement and other dry powders, and water to react the powders and form a cementitious composite when cured.