Role of Environmental Conditions on the Frost Damage of Concrete

研究了室内试验得到的环境因素的影响程度，考虑了各种因素，如温度因素、冻结过程中周围水的影响因素，特别是冻结初期含水量的影响因素。利用这些结果对札幌地区室外暴露的试件进行温度条件估计，并计算冻融试验中暴露期效应与冻融损伤的关系。札幌地区每年100次的冻融试验，按标准试验（ASTM c666 A方法）计算，相当于19个试验周期的影响。

Influence level of environmental factors gained from laboratory tests were investigated various factors had been taken into consideration, such as the factor concerning to the temperature, the factor concerning to the surrounding water during the freezing, and particulary, the factor concerning to the water content during the early period of freezing. These results were adopted for the estimation of temperature conditions of specimens which had been exposed to outdoors in Sapporo, and relation ship between the exposure term effect and the frost damage in freezing-and-thawing test was calculated. The effect of annually 100 freezing-and-thawing of specimens have been left and exposed to outdoors in Sapporo corresponds to the influence of 19 experimental cycles, supposing we applied to standard test (ASTM c666 A Method).