Abstract
In the cold region, semi-rigid base materials are repeatedly subjected to the combined effect of freeze-thaw cycles and vehicle loading, and the supporting capacity and durability of the semi-rigid base structure degenerates generally. The dynamic compressive resilient modulus of semi-rigid base materials with three different cement contents after different curing time and different freeze-thaw cycle numbers were measured at different loading levels using a universal testing machine (UTM-250). The results showed that with the loading level increasing, the dynamic compressive resilient modulus first increased and then decreased, and reached a maximum value at 0.4P, meanwhile the coefficient of variation of the modulus reached the minimum. The loss ratio of dynamic compressive resilient modulus was proposed to evaluate the frost resistance of a semi-rigid base material, and its effectiveness was verified. With the cement content and curing time increasing, the dynamic compressive resilient modulus increased and the frost resistance improved.
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