The durability and service life of concrete structures are related to changes in the concrete surface temperature， which is an external deterioration factor，and the cycles of freezing and thawing that the changes induce. In this study，we predict the relationship between continuous changes in surface temperature about the freezing point and the cycles of freezing and thawing well below the surface，using a method of calculating freezing and thawing at a point below the surface and determining the calculationu27s accuracy based on changing boundary thermal conditions，which are related to solar irradiation and so on.
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