▎ 摘　　要

NOVELTY - A composition (C1) comprises cementitious material, liquid and uniformly dispersed graphene oxide without separate inclusion of dispersant, surfactant or stabilizing agents, which upon curing forms a matrix material that exhibits improved compressive and flexural strength relative to an equivalent non-graphene oxide comprising matrix material. USE - As composition for making matrix materials (claimed) for applications in buildings, roads, bridges, surfaces and pavements, airport runways, dam walls, retaining walls, railway sleepers, pipes, precast elements such as for commercial and residential buildings, cladding, mortar, render, marine and aquatic structure (claimed). ADVANTAGE - The graphene oxide sheets can be readily dispersed throughout cementitious material pastes such that the cementitious matrix formed upon curing exhibits significantly improved mechanical qualities compared to an equivalent cementitious material matrix that does not include graphene oxide. The uniform dispersion of graphene oxide sheets throughout the paste and the matrix material derived from it is able to be obtained without the adoption of separate dispersant, surfactant or stabilizing agents. In the composition, the compressive strength of the matrix material formed upon curing is improved by at least 15%; and the flexural strength of the matrix material formed upon curing is improved by at least 30%. The matrix material exhibits improved compressive and flexural strength relative to an equivalent non-graphene oxide comprising matrix material. The cementitious paste compositions and the matrix materials formed from it can offer a number of significant advantages such as the ability to improve matrix durability, to- reduce the quantity of steel reinforcement required in cementitious matrix structures and thus allows adoption of thinner and lighter concrete structures, allowing for new architectural designs, reduced concrete consumption and improved environmental sustainability. The durability of the matrix materials can be improved due to the reduced need for adoption of corrosive steel (particularly for marine or aquatic applications) and due to enhanced porosity resulting from particles acting as nucleation agents for Ordinary Portland Cement (OPC) hydration. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a matrix material produced by curing the composition (C1); and (2) producing the composition or matrix material involving dispersing graphene oxide sheets within the liquid to form a dispersion without the separate inclusion of dispersant, surfactant or stabilizing agents and mixing the dispersion with cementitious material to form a paste which upon curing forms a matrix material that exhibits improved compressive and flexural strength relative to an equivalent non-graphene oxide comprising matrix material.