▎ 摘　　要

NOVELTY - The impermeable concrete comprises 280-300 pts. wt. cement, 1000-1050 pts. wt. coarse aggregate, 40-50 pts. wt. fly ash, 30-38 pts. wt. expansion gent, 5.6-7.5 pts. wt. water reducing agent, 20-26 pts. wt. composite fiber and 160-180 pts. wt. water. The composite fiber comprises lignin fiber, basalt fiber, and epoxy-based modified polypropylene fiber. The expansion agent is a slow-release expansion agent. The slow-release expansion agent comprises a core layer and a coating layer. The core layer is composed of an expansion agent and melamine/graphene oxide/sepiolite composite, and the coating layer is made of guar gum and boric acid. USE - Impermeable concrete such as civil engineering material used in subway water-rich pressure-bearing sand layer. ADVANTAGE - The impermeable concrete has good service performance, excellent durability, high compression strength, and good impermeability, and can satisfy the requirement of different application scene, and solves the problem of bad durability.