Abstract
To analyze reclaimed asphalt pavement (RAP), mixing mode and additives impacted on fatigue characteristics of recycled stone mastic asphalt (SMA) asphalt mixtures, the hot and warm recycled SMA mixtures with 0%, 20%, and 30% RAP are designed. The warm recycled mixtures are prepared with adding 3% Sasobit into the hot recycled SMA mixture using dry-processing and wet-processing methods. Four-point bending fatigue test is conducted on the recycled mixtures, and the dissipated energy theory is employed to analyze fatigue characteristics of the recycled mixtures. It shows that: (1) the relationship between fatigue life and cumulative dissipated energy of the recycled mixtures does not change with the variation of RAP content and mixing mode. There is a good linear relationship between fatigue life and cumulative dissipated energy of the recycled mixtures, which can be represented by a unique relation equation. (2) When RAP content is lower than 20%, fatigue characteristics of the recycled mixtures has a little change, while when RAP content is higher than 20%, fatigue characteristics of the recycled mixtures experiences a sharp decline. (3) Sasobit additive has an adverse impact on fatigue characteristics of the mixtures without RAP.
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