Abstract
• Waste materials such as RAP, RCA and waste polyethylene can be utilized in place of conventional bituminous paving mixes with improved or similar performance. • Combinations of RAP, RCA and waste polyethylene have profound effect on the rutting, fatigue and moisture damage performance of mix. • Low viscous bitumen can enhance the performance of bituminous mix prepared with a unique combinations of waste and recycled materials (RAP, RCA and waste polyethylene). The present study is an attempt to develop sustainable bituminous paving mixes comprising bulk utilization of waste materials such as reclaimed asphalt pavement ( RAP) and recycled concrete aggregate (RCA), modified by waste polyethylene. Low viscosity grade (VG) bitumens were used as rejuvenators in the modified RAP mixes in this study. For comparison study, a control mix containing conventional stone aggregates (CSA) and VG 40 bitumen was considered. The modified RAP mixes developed were evaluated in terms of performance characteristics and compared with the traditional control mix. Using Marshall tests, the optimum waste polyethylene contents were found to be 6–7% by weight of optimum bitumen content in the respective mix. The modified RAP mixes were found to exhibit higher stability and rutting resistance than the control mix to a significant level. The inclusion of waste polyethylene in modified RAP mixes prepared with RCA or CSA was found to be less susceptible to moisture-induced damage. Significant improvements in the performance of RAP mixes containing CSA or RCA in combination with waste polyethylene were observed. ANOVA analysis indicates that coarse aggregate types have a significant influence on the performance of RAP mixes, especially with the addition of waste polyethylene. It is concluded that the RAP mixes prepared with different combinations of CSA or RCA with waste polyethylene can be considered as a suitable option for CSA-VG40 control mix and thus, can enhance the high and intermediate temperature performances of the RAP mix to a significant level.
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