Abstract
The Changchun area belongs to the seasonal freezing area, and concrete structures are often damaged due to freeze-thaw cycles, and the degree of performance deterioration of concrete has a non-linear relationship with the number of freeze-thaw cycles. With the increase in the number of freeze-thaw cycles, the degree of deterioration of concrete performance deepens. However, the outdoor environmental conditions are complex, and the number of freeze-thaw cycles is usually difficult to determine. Therefore, we substituted the two performance index data of concrete under natural outdoor conditions and combined the results of the two indoor slow freeze-thaw tests. With the combination of results of the two fitting equations, the estimated number of slow freeze-thaw cycles was found to be corresponding to different dates under complex outdoor freeze-thaw environmental conditions, which will degrade the strength of concrete. It is of certain guiding significance for the evaluation of the service life of the building.
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