The present invention is a cement composition for high temperature environments that comprises at least Portland cement and fly ash that satisfies all of the conditions (F1) to (F6) of fly ash, wherein the content of the fly ash is 10 to 50 mass% of 100 mass% of the total of the fly ash and the Portland cement. (F1) The fly ash has a Blaine specific surface area of 2500 to 6000 cm2/g.(F2) The fly ash has a mass reduction rate after being heated at 975±25°C for 15 minutes of 5 mass% or less.(F3) The fly ash has an SiO2 content of 50 mass% or more.(F4) The fly ash has a mass ratio of (Na20+0.658×K20)/(MgO+SO3+TiO2+P205+MnO) of 0.2 to 1.0 (provided that the unit of the chemical formulas in the formula is mass%).(F5) The particles in the fly ash in which iron oxides and amorphous particles are mixed have a sphere equivalent specific surface area of 2800 to 11000 cm2/cm3.(F6) The amorphous particles containing Ca in the fly ash have a sphere equivalent specific surface area of 2100 to 22500 cm2/cm3.
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机译：本发明是用于高温环境的水泥组合物，其至少包含满足粉煤灰的所有条件（F1）至（F6）的波特兰水泥和粉煤灰，其中粉煤灰的含量为10至50质量％。占粉煤灰和硅酸盐水泥总量的100质量％。 （F1）粉煤灰的布莱恩比表面积为2500至6000 cm 2 / g。（F2）粉煤灰在975±25℃下加热15分钟后的质量降低率为5质量％以下。（F3）粉煤灰的SiO 2 含量为50质量％以上。[F4）粉煤灰的质量比为（Na 2 0 + 0.658×K 2 0）/（MgO + SO 3 + TiO 2 + P 2 0 5 + MnO）为0.2到1.0（前提是化学式中的单位为质量％ ）。（F5）混有氧化铁和无定形颗粒的粉煤灰中的颗粒的当量比表面积为2800至11000 cm 2 / cm 3 。（F6）粉煤灰中含有Ca的无定形颗粒具有的球当量比表面积为2100至22500 cm 2 / cm 3 。
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