CEMENT AND BLENDED CEMENT

摘要

Provided are: a cement which enables the increase in the use amount of a waste material that can be used as a raw material for a burned material (clinker) and which has the same physical properties as those of high-early-strength portland cement; and a blended cement containing the cement. A cement which comprises a pulverized product of a burned material having a hydraulic modulus (H.M.) of 2.10 to 2.30, a silica modulus (S.M.) of 1.80 to 2.48, an iron modulus (I.M.) of 1.3 to 2.6, and a 3CaO·SiO2 content of 70.0 mass% or less in 100 mass% of the burned material as calculated in accordance with the Bogue formula and gypsum, wherein the content ratio of the gypsum in 100 mass% of the cement is 1.2 mass% or more in terms of SO3 content, and the amount of gypsum hemihydrate relative to the total amount of gypsum dihydrate and the gypsum hemihydrate in the cement is 30 mass% or more in terms of SO3 content; and a blended cement which comprises the cement and a cement admixture material, wherein the cement admixture material comprises a blast furnace slag fine powder and/or coal ash.