| 摘要 |
Provided are: cement compositions which can keep or improve the strength development of cement paste, mortar or concrete while keeping the properties of cement paste, mortar or concrete in the fresh state; and a process for producing the same. A cement composition having a V content of 0.0063 to 0.012 mass%; a cement composition as described above, which has an Sr content of 0.035 to 0.08 mass%; and a process for producing cement compositions which comprises a step (A) of adjusting the unit requirements of raw materials selected from the group consisting of limestone, silica stone, coal ash, clay, blast furnace slag, soil generated by construction works, sewage sludge, hydrocakes, and iron sources so as to yield a cement composition having a V content of 0.0063 to 0.012 mass%, and firing the raw materials thus adjusted to form a cement clinker and a step (B) of pulverizing the cement clinker, gypsum, and an admixture together. |
