Fatigue of asphalt mixtures is a complex subject. In phenomenological fatigue models, the shift factor between laboratory fatigue tests and field data is huge. A significant portion of the shift factor is due to healing of microdamage, and the major contributor to healing is the asphalt cement and/or mastic component of the mixture. The DMA offers an efficient and reliable means of assessing both the fatigue and healing of binders and mastics. In this study cylindrical, sand asphalt samples are tested in the DMA. Several candidate fatigue failure parameters are considered to assess fatigue life and the effect of rest periods on the extension of fatigue life through healing. The effects of rubber modification and aging are also evaluated. The DMA analysis not only allows a repeatable and accurate assessment of healing but also provides insight into the mechanism of fatigue damage.
|Original language||English (US)|
|Number of pages||31|
|Journal||Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions|
|State||Published - Dec 1 2002|
- Asphalt Mixture
- Fatigue Fracture