▎ 摘　　要

NOVELTY - Concrete for repairing bridge expansion joint, comprises 260-285 pts. wt. gel material, 3-8 pts. wt. composite fiber, 2-5 pts. wt. nano tackifier, 620-700 pts. wt. aggregate, 1-5 pts. wt. water reducing agent, 0-2 pts. wt. auxiliary material, and 50-80 pts. wt. water. The nano tackifier comprises nano graphene oxide. USE - The concrete is useful for repairing bridge expansion joint in bridge building material field. ADVANTAGE - The concrete has good adhesion performance with ultra-high performance concrete, and can realize quick repair of bridge expansion joint. The nano tackifier containing oxidized graphite is easier to permeate into the ultra high performance concrete. The graphene oxide provides base point for the gel material, promotes the gelling material of hydrated gel, and improves the early strength, so that the construction is more convenient. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparation method of concrete for repairing bridge expansion joint; and using method of concrete for repairing bridge expansion joint.