▎ 摘　　要

NOVELTY - A polymer cement mortar composition comprises 40 wt.% functional binder, 50 wt.% fine aggregate, 1 wt.% graphene dispersion, and 9 wt.% water. The functional binder comprises 31-35 wt.% crude Portland cement, 20 wt.% calcium or magnesium sulfoaluminate, 10 wt.% calcium chloroaluminate, 5 wt.% hollow silica, 5 wt.% diatomaceous earth, 5 wt.% gypsum, 5 wt.% lithium silicate-potassium silicate mixture, 5 wt.% bentonite, 1 wt.% emery powder, 0.1-2 wt.% ethylene-vinyl acetate-vinyl chloride copolymer, 0.1-2 wt.% methyl methacrylate-styrene butadiene copolymer, acrylonitrile-butadiene-polyvinyl chloride copolymer, cellulose acetate, water-reducing agent, curing retardant, antifoam agent, magnesium silicate, titanium oxide, 3-acryloxypropylmethylbis(trimethoxy)silane, alkyl polyacrylate, tetrafluoroethylene-trifluoronitrosomethane copolymer, propylene glycol alginate, and at least one hydrophilic fibers chosen from polypropylene fibers, polyester fibers, nylon fibers, and macrofibers. USE - Polymer cement mortar composition is used for repairing and reinforcing structural section of concrete (claimed). Uses include but are not limited to road sideway, median strip, wing wall, sewage pipe, sewage box, waterways, waterway bridge, and water supply tunnel. ADVANTAGE - The polymer cement mortar composition has excellent strength and durability by using graphene having high powder degree, and excellent flexural toughness, acid resistance, alkali resistance, chloride penetration resistance, neutralization resistance, freeze-thaw resistance, and water resistance. During repair and reinforcement of concrete structure, only water can be injected and used at the site, so that site constructability is improved and early strength can be expressed, which shortens construction period to reduce traffic opening time, and extends common period of the concrete structure. DETAILED DESCRIPTION - A polymer cement mortar composition comprises 40 wt.% functional binder, 50 wt.% fine aggregate, 1 wt.% graphene dispersion, and 9 wt.% water. The functional binder comprises 31-35 wt.% crude Portland cement, 20 wt.% calcium or magnesium sulfoaluminate, 10 wt.% calcium chloroaluminate, 5 wt.% hollow silica, 5 wt.% diatomaceous earth, 5 wt.% gypsum, 5 wt.% lithium silicate-potassium silicate mixture, 5 wt.% bentonite, 1 wt.% emery powder, 0.1-2 wt.% ethylene-vinyl acetate-vinyl chloride copolymer, 0.1-2 wt.% methyl methacrylate-styrene butadiene copolymer, 0.1-2 wt.% acrylonitrile-butadiene-polyvinyl chloride copolymer, 0.1-2 wt.% cellulose acetate, 0.01-0.5 wt.% water-reducing agent, 0.01-0.5 wt.% curing retardant, 0.01-0.5 wt.% antifoam agent, 0.01-0.5 wt.% magnesium silicate, 0.01-0.5 wt.% titanium oxide, 0.01-0.5 wt.% 3-acryloxypropylmethylbis(trimethoxy)silane, 0.01-0.5 wt.% alkyl polyacrylate, 0.01-0.5 wt.% tetrafluoroethylene-trifluoronitrosomethane copolymer, 0.01-0.5 wt.% propylene glycol alginate, and 0.01-0.5 wt.% of at least one hydrophilic fibers chosen from polypropylene fibers, polyester fibers, nylon fibers, and macrofibers. The graphene dispersion is obtained by adding graphene powder to an acid solution, stirring at 200 degrees C for 3 hours, cooling to room temperature, and adjusting pH to 8 using an alkaline solution to obtain a dispersion comprising 15 wt.% graphene. The fine aggregate includes 90 wt.% silica and 10 wt.% mullite. The polymer cement mortar composition has a flexural strength of 10.5-13 MPa, a compressive strength of 54-60 MPa, and an adhesive strength of 2.1-2.4 MPa under standard condition and 2.1-2.3 MPa after repeated heating and cooling, measured according to KS F 4042, a length change rate of 0.01-0.03%, a water permeability of 0.12-0.25 g, a chloride ion penetration resistance of 290-415 Coulomb, a neutralization resistance of 0.1-0.18 mm, and a chemical resistance of -0.01-0.1 for sulfuric acid and 0.4-0.9 for sodium hydroxide measured according to the original draft of Japanese industrial standard by immersing a test sample in an aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide as a test solution for 28 days, a durability index of 93-95 measured by freeze-thaw resistance test according to KS F 2456, a deodorization rate of 83-88% measured using an ammonia gas detection tube according to KFIA-FI-1004, a thermal conductivity of 10.2-10.5 W/m.K measured according to KS F4039, and an electroconductivity of 11-12 S/m. An INDEPENDENT CLAIM is included for repair and reinforcement of concrete structure.