3.成型時圧力のセメント製板に及ぼす影響について(第8報) : セメントモルタルの加圧による脱水について

概要

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In the press cast forming of thin cement mortar board we extend the workable mortar by applying uniform pressure upon its whole surface and, at the same time, push out one part of mixed water. The author confirmed already by experiments that the extension of mortar took place under the lower pressure at the early stage of pressing and, after the extension ended, the dehydration occurred with the progress of pressing, both the extension and the dehydration taking place in a very short time. The author has recently investigated the relationships between the hydration of mortar and (1) proportion and flow of mortar, (2) diameter and distribution of holes for dehydration, (3) magnitude and speed of pressure and so forth. The conclusions obtained are as follows: In the press cast forming of thin mortar board, the dehydration of mixed water has no relation to proportion of mortar, casting pressure and distribution of squeezing holes but to the flow of mortar (mainly to quantity of water). The extension of mortar is dependent on its proportion (mainly on quantity of cement paste). There is no mutual relation between the extension and the dehydration. The diameter of holes for dehydration not less than 5 mm is preferable. The reduction of water cement ratio after press casting is about 30% at maximum, which is independent on the magnitude of applied pressure.
社団法人日本建築学会の論文
1955-09-30