(57) Provided is a cement additive which can significantly improve strength of a cured product of a cement composition for a prolonged period of time. Also provided is a cement composition which includes the cement additive. This cement additive includes: a compound (A) which has a mass average molecular weight of greater than 3000 and a structure in which 5 mol or more of alkylene oxide is added to 1 mol of polyhydric alcohol; and an alkanolamine compound (B).
(71) Nippon Shokubai Co., LTD., Osaka (JP)
(84) ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)