セメント混合材の研究-1-

概要

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There are many kinds of natural siliceous pouzzolanic materials in Japan, some of them are now being used as admixture for these years to make Portland pouzzolanic cement, which is called "Silica Cement", and standardized in the Japanese Industrial Standards as JIS R 5212.In the present paper, the authors collected three kinds of natural siliceous puzozolanic materials, (a) Kayo-hakudo from Beppu, Oita Pref., which is one of the most famous and superior quality, (b) Keisan-hakudo from Matsuyama, Saitama Pref., and (c) scrap of Oya-ishi from Oya near Utsunomiya, Tochigi Pref. These samples were tested and compared on their several properties as cement admixture, e.g., chemical compositions, especially the important soluble compositions, physical tests of hardened strength of 1:2-plastic sand mortar, content of free lime amount in the hardened mortar cured for several weeks, the lime reaction in the lime-pouzzolan mortar, etc. These samples were confirmed to be of good quality tested by the "Chemical Test for Alkali Reactivity of Pouzzolans" of the U.S. Department of the Interior Bureau of Reclamation.These Pouzzolan samples are now further being studied by comparing with other samples of natural and artificial pouzzolans, which results will be reported in the near future as the continuing papers.
社団法人日本セラミックス協会の論文