The present invention, based on 100 parts by weight of cement, 5 to 30 parts by weight of calcium sulfoaluminate; 5 to 20 parts by weight of charcoal powder; Cellulose fibers 1 to 10 parts by weight; 5 to 30 parts by weight of silica sand; 1 to 10 parts by weight of methyl methacrylate; Limestone 2 to 10 parts by weight; 10 to 60 parts by weight of fly ash; 1 to 20 parts by weight of nano-ceramic particles; 3 to 15 parts by weight of an antioxidant; 1 to 10 parts by weight of an adhesion promoter; 1 to 10 parts by weight of a thickener; And it provides a mortar composition for cross-section repair comprising 0.5 to 5 parts by weight of an antifoaming agent and a cross-section repair method using the same. The mortar composition for cross-section repair according to the present invention has the effect of improving the working environment and reducing environmental pollution while having the strength equal to or higher than that of conventional cement.
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