Abstract
This paper aims at analyzing the local strain fields in several asphalt mixtures exposed freeze-thaw cycles. Four types of asphalt with different Recycled Asphalt Pavement (RAP) content (0%, 20%, 40%, and 100% of RAP) were considered. They were subjected to freeze-thaw cycles, in the temperature range of −11°C and 20°C. The local contraction/expansion of these samples during the cooling/heating was measured using the Grid Method (GM) and Digital Image Correlation (DIC). The strain distribution is very heterogeneous due to the difference between the thermal contraction coefficients of aggregates and mastic (i.e., bitumen and filler). The thermal responses of the mixture under study were compared at the micro- and the macro-scales.
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