貯藏ポルトランドセメントの風化に就て (第1報)

抄録

The author has studied on the effect of storage on Portland cement, packed in paper and jute bags. These bags were stored in a ordinary store house for 5 months, from April 3 to September 3, 1933.
The tests of the stored cement were carried out the every zones in the bags.
The results are: (1) The loss on ignition of the cement of the outer zone (2-3cm thick) was more remarkable than those of the next and central parts. (2) The setting time of the cement of the outer zone was retarded more than those of the next and central parts.
(3) The strength of the cement of the outer zone showed extraordinary decrement, i.e. 40-50 per cent in compression and 20 per cent in tension respectively.