1017 モルタルの凍害に及ぼす凍結持続時間の影響 : 気中凍結12時間以内の場合について(材料・施工)

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  • 1017) Effect of Continued Freezing Time upon the Results of Freezing-and-Thawing Mortars(Materials, Execution)
  • モルタルの凍害に及ぼす凍結持続時間の影響
  • モルタル ノ トウガイ ニ オヨボス トウケツ ジゾク ジカン ノ エイキョウ
  • 1) EFFECT OF CONTINUED FREEZING TIME UPOL THE RESULTS OF FREEZING-AND-THAWING MORTARS

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This paper contains the experimental considerations pertaining to continued freezing time which may influence results of accelerated freezing-and-thawing tests. To obtain on this subject, test specimens are kept in a freezing unit for different lengths of times (3, 6, 12 hr). After removal from the freezing unit, the specimens are remined in a thawing unit at 20℃ for 1 hr. These tests consist of 2 series as following, Series I Cement……Portland cement. Fine aggregate……River sand. Mix properties……1:2 (weight) water-cement ratio 50%. Series II Cement……Portland Cement. Fine aggregate……Standard sand. Mix prperties……1:2 (wheight) water-cement ratio 55%, 65%. It is conculded that the frost resistance of cement mortars is influenced by the continued freezing time, and that is approximately directly proportional to the continued freezing time.

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