WO 2020/170397 A1

Cement composition for high-temperature environments, and concrete for high-temperature environments

(22) 21.02.2019

(43) 27.08.2020

(57) The present invention is a cement composition for high-temperature environments containing at least Portland cement and fly ash satisfying all the fly ash conditions in (F1) to (F6), the fly ash content ratio being 10 to 50% by mass when the sum total of the Portland cement and the fly ash is 100% by mass, and the cement composition being used for concrete defined by the definition for the following concrete for high-temperature environments. [Fly ash conditions] (F1) Blaine specific surface area for the fly ash is 2500 to 6000 cm2/g (F2) After the fly ash has been heated at 975±25°C for 15 minutes, the fly ash mass loss rate is 5% by mass or less (F3) In the fly ash, the SiO2 content ratio is 50% by mass or more (F4) In the fly ash, the mass ratio (Na2O+0.658xK2O)/(MgO+SO3+TiO2+P2O5+MnO) is 0.2 to 1.0 (in the formula, the chemical formula units are percentages by mass) (F5) In the fly ash, the sphere-converted specific surface area of particles wherein iron oxide and a non-crystalline substance are mixed, is 2800 to 11000 cm2/cm3 (F6) In the fly ash, the sphere-converted specific surface area of non-crystalline particles containing Ca is 2100 to 22500 cm2/cm3 [Definition for the concrete for high-temperature environments] Concrete containing at least (Cnl) to (Cn5) to be used where the mean temperature (environmental temperature) in the vicinity of the concrete is 25°C or higher. (Cnl) Cement composition for high-temperature environments (Cn2) Super retarding water-reducing agent (R1) (Cn3) Water-reducing agent (R2) excluding super retarding water-reducing agent (R1), retarding-type water-reducing agent, retarding-type AE water-reducing agent, and retarding-type high-performance AE water-reducing agent (Cn4) Fine aggregate (Cn5) Coarse aggregate (Cn6) Water

(71) Taiheiyo Cement Corporation, Tokyo (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)


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