▎ 摘　　要

NOVELTY - Repairing of electromagnetic wave shielding function in a concrete structure involves removing foreign substances and deteriorated components of the concrete structure, cleaning the foreign substances of the surface-treated concrete structure with high-pressure washing water, applying a surface reinforcement material to the concrete structure from which the foreign material has been removed, applying the repair material comprising 30-40 wt.% cement, 30-50 wt.% silica sand, 5-10 wt.% expansion material, 5-20 wt.% admixture, 0.2-1.5 wt.% fluidizing agent, 0.5-5 wt.% graphene-coated polyarylate fiber, and 1-5 wt.% polymer on the surface reinforcing material application site, applying a surface protection material on the repair material application site, and uniformly applying the ceramic coat material after the surface protection material is applied. USE - Repairing of electromagnetic wave shielding function in concrete structure e.g. building or bridge. ADVANTAGE - The method improves electromagnetic wave shielding performance, flexural strength and water resistance to improve the durability of the repair site. DETAILED DESCRIPTION - Repairing of electromagnetic wave shielding function in a concrete structure involves removing foreign substances and deteriorated components of the concrete structure, cleaning the foreign substances of the surface-treated concrete structure with high-pressure washing water, applying a surface reinforcement material to the concrete structure from which the foreign material has been removed, applying the repair material comprising 30-40 wt.% cement, 30-50 wt.% silica sand, 5-10 wt.% expansion material, 5-20 wt.% admixture, 0.2-1.5 wt.% fluidizing agent, 0.5-5 wt.% graphene-coated polyarylate fiber, and 1-5 wt.% polymer on the surface reinforcing material application site, applying a surface protection material on the repair material application site, and uniformly applying the ceramic coat material after the surface protection material is applied. The graphene-coated polyarylate fiber is obtained by preparing an aqueous dispersion solution of graphene oxide in which graphene oxide and a polymer compound having an acidic group in the side chain are mixed and dispersed, etching the surface of the polyarylate fiber, treating it with polyethyleneimine, treating the graphene oxide aqueous dispersion solution to coat the graphene oxide, and reducing the graphene oxide. The high molecular compound having an acidic group in the side chain is carboxymethylcellulose or alginic acid and used in an amount of 0.5-2 times the weight relative to the graphene oxide.