| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method for cement capable of preparing concrete and the like optimized by favorable fluidity just after kneading and to the extent of small change with time of fluidity.SOLUTION: There is provided a method for production of cement including the ground material of cement clinker and gypsum. The method includes deciding the percentage of hemihydrate gypsum in the total amount of dihydrate gypsum and hemihydrate gypsum in response to the magnitude of a water-soluble alkali component content in a cement clinker. The content of the water-soluble alkali component in the cement clinker is calculated as an estimate, based on respective measurement values of the chemical composition (MgO, SO, NaO and KO) and the mineral composition (alite and ferrite phase).SELECTED DRAWING: Figure 2 |
