セメント混合材と石灰との反応セメント混合材の研究 (第2報)

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The authors, in continuing their previous report (This Journal, 62 [696] 403-406 (1954)), report in the present paper the results of further studies on the reaction between lime and various siliceous pozzolanic materials as Portland cement admixture. Three siliceous admixtures, i.e., (1) Beppu-hakudo from Oita Pref., (2) Matsuyama-hakudo from Saitama Pref., and (3) Oya-ishi from Tochigi Pref., are most famous in Japan, and were collected and analysed by the total analysis and the special soluble analysis. Nextly, these samples were analysed to confirm the amounts of soluble silica, alumina and Fe2O3 by heating with dilute HCl (d=1.12) solution at 20°C or 50°C- the so-called “Florentin” method. The amount of free lime in the hardened test piece of lime (50 parts) with one of the above siliceous admixtures (50 parts), was determined by the tribrophenol method or the glycerine-alcohol solution method (ASTM). And then, the hydrated reaction products between lime and siliceous admixture were calculated by using the results obtained in the above mentioned “Florentin” method and free lime determination method. The hydrated product of calcium silicate hydrate xCaO⋅ySiO2⋅zH2O in the cases of (2) and (3) siliceous admixtures of common amount of silica (about 69-70%) content was determined to be CaO⋅SiO2⋅mH2O having molecular ratio of CaO to SiO2 (c/s) nearly 1.0, but in the case of the specially high silica (about 94%) content of (1) admixture it was obtained the ratio (c/s)=1.0-2.0, which shows the product of calcium silicate hydrate to be the mixture of CaO⋅SiO2⋅mH2O and 2CaO⋅SiO2⋅nH2O or 3CaO⋅2SiO2⋅nH2O. On the other side, it is doubtful whether the determination of soluble SiO2, Al2O3, and Fe2O3 by the “Florentin” method is suitable or not, owing to the fact of colloidal silica separates in the course of treatment with dilute HCl (d=1.12) solution.
社団法人日本セラミックス協会の論文

セメント混合材と石灰との反応セメント混合材の研究 (第2報)

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