Abstract
Calcium aluminosulfate (3CaO.3AlO.CaSOor AS) was prepared by chemical synthesis from the nitrate salts and aluminum sulfate. AS was the main phase after calcination at 110. The specific surface areas after calcination at 110 and 130 were about 2.5 and 1.0 /g, respectively. Hydration was investigated by XRD, DSC, SEM, EDS, conduction calorimetry and analysis of the liquid phase. Calorimetry showed that the induction period was longer than that of a sample prepared by conventional solid state sintering and this was attributed to the formation of amorphous coatings in abundance of O and SO. Crystalline hydration products, principally calcium monosulfoaluminate hydrate and Al(OH), appeared subsequently.ᜎࠀࠀ㘲㌮㠵㘻Ԁ䭃䑎䷕᜕ఽ0〳⸵㬅K䍄乍븗ጊ缀Ѐ㘰〻Ԁ䭃䑎䶩ഏ3㠴⸰㠻Ԁ䭃䑎䴀
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