アルミナセメントの水和におよぼすSO_3の影響

概要

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The authors investigated the hydration of aluminous cement manufactured by the burning process, especially investigated the relationship between the process of heat evolution of the aerated cement and the including SO3.SO3 in the burned aluminous cement clinker remains in the form of calcium sulfoaluminate [3(CaO⋅Al2O3)⋅CaSO4], and it influences the rate of hydration when the cement is aerated.The results obtained are summerized as follows;(1) Both aluminous cement A which contains 0.7% of SO3 and B which contains 0.2% equally had the heat of hydration value 77cal/g, but the time of exothermic peak of A cement delays about 30 to 60 mins. in comparison with B and the pattern on the rate of heat evolution of A changed after aeration, too.(2) Investigating chemical contents of the solution extracted from neat paste mixed for 5 mins., the solubility of A cement changed by aeration from 1, 690 to 990mg/l in Al2O3, 1, 140 to 950mg/l in CaO, 0 to 20mg/l in SO3. In addition, the X-ray figure of the precipitated material changed from β-2CaO⋅Al2O3⋅8H2O plus 3CaO⋅Al2O3⋅CaSO4⋅12H2O to 3CaO⋅Al2O3⋅CaSO4⋅12H2O plus 3CaO⋅Al2O3⋅3CaSO4⋅32H2O.(3) In the case of synthesized 3(CaO⋅Al2O3)⋅CaSO4 the rate of heat evolution is also influenced like A cement by aeration.
社団法人日本セラミックス協会の論文
1971-09-01