Abstract
Cracking resistance of stone matrix asphalt (SMA) mixes is determined with and without reclaimed asphalt pavement materials (RAP) using coarse aggregates having elongation and flakiness index (EI+FI) of 25 and 35% respectively. The RAP at varying proportions viz 0, 10, 20 and 30% were blended with shredded plastic waste (SWP) at dosages of 4, 8, 12 and 16%. Zycotherm is used as warm mix asphalt (WMA) additive. Volumetric properties were determined at optimum binder content using Marshall mix design. Semicircular bending test was carried out to determine cracking resistance. No significant change in fracture resistance was observed for mixes prepared using aggregates having (EI+FI) of 25 and 35%. The strain energy release rate (Jc) for SMA specimen using VG-30 with varied RAP content of 10, 20 and 30% was found to be 0.55, 0.58 and 0.62 kN-mm respectively. The addition of SWP increased Jc value up to 8% for hot asphalt SMA mixes. Decrease in Jc was observed for above SMA specimens when prepared using WMA additive. It was observed that addition of WMA enables utilization of SWP up to 12% and use of SWP in SMA mix prepared with RAP increases resistance to cracking.
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