Experimental investigation of the fatigue phenomenon in nano silica-modified warm mix asphalt containing recycled asphalt considering self-healing behavior

This study investigates the fatigue performance of nano silica-modified warm mix asphalt containing recycled asphalt pavement (RAP) with self-healing properties. To achieve this goal, Sasobit was added at 2 wt% and nitric oxide at 3 wt%, 5 wt% and 7 wt% to the bitumen and mixed with a high shear mixer. In order to simulate aging in warm asphaltic mixtures, 0, 70 and 100 wt% of the RAP were used to prepare four-point bending test slabs. Then, the beams obtained from the slabs were evaluated under constant strain at two strain levels of 400 and 800 µm. The results showed that addition of nano -silica can significantly improve the self-healing behavior of warm asphalt mixtures. Furthermore, the healed specimens showed significant flexural stiffness. On the other hand, the self-healing behavior of asphalt samples with and without RAP and nano-silica were substantially different under constant strains of 400 and 800 µm.

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  • English

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  • Accession Number: 01737538
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 23 2020 3:58PM