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In temperate areas like Kyushu, the interest in frost damage of concrete is low, and deterioration situation is not sufficiently grasped. Although the degree of risk of frost damage is rank 1 in the v...icinity of Aso and Unzen in Kyushu, frost damage occurs in other inland areas and mountainous areas. In cold areas, frost damage is likely to occur on the south side because the maximum temperature is often below freezing, and once concrete is frozen it must require the action of solar radiation to melt. However, in Kyushu, the lowest temperature rarely is below freezing, and concrete can be melted without the action of solar radiation. Therefore, in order to know the characteristics of frost damage in Kyushu, we made visual investigation of concrete structures. As a result, we found that the frost damage in Kyushu has characteristics different from those in cold areas such as deterioration seen in all directions.show more
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