PROBLEM TO BE SOLVED: To provide a low-carbon neutralization-suppression mortar composition that suppresses neutralization as well as is excellent in compressive strength.SOLUTION: Provided is a low-carbon neutralization-suppression mortar composition comprising inorganic fine powder, gypsum, fine aggregate and kneading water and in which: the inorganic fine powder is composed of cement and blast furnace slag fine powder and the mass ratio of cement and blast furnace slag fine powder (cement: blast furnace slag) is from 10:90 to 30:70; the amount of gypsum is 6 to 10 pts.mass with respect to 100 pts.mass of the inorganic fine powder; and the kneading water has a pH of 10 to 14 and a Ca ion concentration of 100 to 5000 mg/L. The low-carbon neutralization-suppression mortar composition in which the kneading water has a Na ion concentration of 10 to 500 mg/L and a Ka ion concentration of 10 to 500 mg/L, and furthermore a SOion concentration of 10 to 5000 mg/L and a Cl ion concentration of 1 to 100 mg/L.SELECTED DRAWING: None
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