| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a cement composition which improves strength development properties of a hardened product of a cement paste, mortar or concrete, while retaining the fresh properties of the cement paste, mortar or concrete. <P>SOLUTION: The method for producing a cement composition includes a step (A) in which the unit requirements of raw materials selected from the group consisting of limestone, silica stone, coal ash, clay, blast furnace slag, soil come from construction, sewage sludge, hydrocake and iron sources are adjusted in such a manner that the resulting cement composition has an Sr content of 0.02-0.06 mass%, an Mo content of 0.0002-0.0023 mass% and an R<SB POS="POST">2</SB>O content of 0.3-0.6 mass%, and the adjusted raw materials are calcined to produce cement clinker, and a step (B) of pulverizing the cement clinker and gypsum. <P>COPYRIGHT: (C)2013,JPO&INPIT |
