特殊アルミナセメントの研究 (第7報) セメントの物理性を支配する因子について

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In continuing the previous studies (Reports 1-6), in the present paper were reported the results of fundmental studies on the factors relating to the important physical properties of the special alumina cements obtained from high aluminous residue of potassium sulphate extraction of alunite ores.Various compounds, which can be surmised to be produced and contained in the clinker of the present special alumina cements from alunite, of calcium aluminates (mCaO⋅nAl2O3), calcium silicates (mCaO⋅nSiO2), calcium alumino-silicates (1CaO⋅mAl2O3⋅nSiO2), calcium ferrites (mCaO⋅nFe2O3), calcium alumino-ferrites (1CaO⋅mAl2O3⋅nFe2O3), ferrous silicates (mFeO⋅nSiO2), ferrous aluminates (mFeO⋅nSiO2), calcium magnesio-silicates (1CaO⋅mMgO⋅nSiO2), etc., were fully discussed and compared with those from other samples of common alumina cements, by various studying methods of microscope, X-ray analysis, separation of fine crystal powder by heavy liquide, etc.Among these results, the large amount contamination of 2CaO⋅Fe2O3 in the heavy specific gravity part (above 3.33) has the most inferior effect on the hardened strength, and the exsistences of 3CaO⋅Al2O3 and various alumino-silicates mAl2O3⋅nSiO2 (sillimanite Al2O3⋅SiO2, mullite 3Al2O3⋅2SiO2, etc.) are of most ambiguous points, which must be studied in the future studying.
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