▎ 摘　　要

NOVELTY - A cement concrete durability enhancement admixture comprises sulfonated graphene, graphene, graphene oxide, and water. The total effective solid content of sulfonated graphene, graphene, and graphene oxide is 1-10%. The ratio between graphene and graphene oxide is an arbitrary ratio. The mass content of sulfonated graphene is not less than 2 times of the total mass of graphene and graphene oxide. The sulfonated graphene is a water-dispersible graphene modified with a sulfonic acid group covalent bond. The sulfonated graphene comprises carbon and sulfur in a ratio of (24-1):1. USE - Cement concrete durability enhancement admixture used in preparation of cement-based composite material (claimed). ADVANTAGE - The cement concrete durability enhancement admixture has high durability, bending strength, and tensile strength, and excellent chloride ion permeability resistance. DETAILED DESCRIPTION - A cement concrete durability enhancement admixture comprises sulfonated graphene, graphene, graphene oxide, and water. The total effective solid content of sulfonated graphene, graphene, and graphene oxide is 1-10%. The ratio between graphene and graphene oxide is an arbitrary ratio. The mass content of sulfonated graphene is not less than 2 times of the total mass of graphene and graphene oxide. The sulfonated graphene is a water-dispersible graphene modified with a sulfonic acid group covalent bond. The sulfonated graphene comprises carbon and sulfur in a ratio of (24-1):1. The sulfonated graphene has thickness of 0.35-30 nm, and maximum radial size of 1-100 mu m. The graphene is a carbonaceous material composed of a sheet structure having thickness of 0.35-100 nm, and maximum radial size of 1-100 mu m. The graphene oxide comprises carbon and oxygen in a ratio of (1000-10):1. The graphene oxide has thickness of 0.35-100 nm, and maximum radial size of 1-100 mu m. An INDEPENDENT CLAIM is included for application of cement concrete durability enhancement admixture in preparation of cement-based composite material, which involves adding cement concrete durability enhancement admixture comprising sulfonated graphene, graphene, and graphene oxide to cement in a ratio of 1:10000-1:100.