抄録
In Japan, the qualities of Portland blast-furnace slag cement have been rapidly improved by the“Separate Grinding Method”recommended by Dr. Touru Mori. The present author's study up to this time show that there exists a slight difference in quality between concretes using ordinary Portland cement and Portland blast-furnace slag cement under the condition of the approximately same water-cement ratio and slump, and that the former can be advantageously used for the conventional structures or those which have the massive section or may be affected by sea water. However, it should be noted that the high content of iron-blast-furnace slag in concrete retards the development of early strength, and thus it requires longer initial curing and mold retaining periods by one or two days than the ordinary Portland cement, while it provides higher resistances against heat, acid and sulfates in sea water and hot spring water.
