2) SOME EFFECTS OF HIGH TEMPERATURE AND PRESSURE STEAM CURING ON MORTARS

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  • 2 高温高圧蒸気養生のセメントモルタルについて
  • 高温高圧蒸気養生のセメントモルタルについて
  • コウオン コウアツ ジョウキ ヨウジョウ ノ セメントモルタル ニ ツイテ

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This paper discussed on some effects of autocraving on cement mortar, and dealed primarily with test results obtained with 11 different cement and 11 silica aggregates. In these tests involving as many as 3000 specimens, writter aimed to obtaine most effective condition on time-temperature relation of autoclaving and suitable mixing ratio of cement mortar. The following conclusions may be drawn from the results of these investigation. 1. A. Tests shows that autoclaving of neat cement products are not sutable. B. But, in the tests on cement-silica mortar products, autclaving shows remarkable effects on strength and dimentional stability of them. Esepcially, high calcareous or low C_4AF type cements shows good results. C. Some tests used by slag cement show good effects 5hr autoclaving at 180℃, and these studies suggested that this type of cement are possible to shorten the curing period. 2. A. Suitable quality of silicareous aggregate are shown that, chemical composition of silica are to be 90% and more, and also its fineness are to be about 4000cm^2/gr (by blain value) B. In autoclaring of mortar, using by these aggregates high strength obtained from 30 to 50% mixing ratio (by weight) 3. A. Volume change of specimen after cure, generally shows the tendency of shrinkage. And quite a few specimen had expanded, but it's properties are not better than shrang's. B. The dynamic young's modulus of specimens cured at 150℃ is smaller than same strength one curedat 180℃. 4. Autoclaring process shows the remarkable effects on curing of cement products at the point of mechanical physical properties and also properties of long age.

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