Evaluation of Reclaimed Asphalt Pavement in Stone matrix asphalt using Rejuvenators

Abstract

Increased price along with the scarcity of pavement materials and environmental benefits has encouraged the pavement industry to use Reclaimed Asphalt Pavement (RAP) in pavement construction. Stone Matrix Asphalt (SMA) is gap-graded bituminous mixture, developed exclusively to improve rutting resistance and durability of pavements. newlineMany researchers concluded that incorporation of RAP is complicated and, increases newlinethe stiffness of the mixtures, which adversely affects the performance. The rejuvenating newlineagent is generally used to reduce the stiffness of bituminous mixtures incorporating newlineRAP. This research aims to evaluate the feasibility of incorporating high RAP content in newlineSMA mixture using different rejuvenators. To achieve this research objectives, systematic newlinelaboratory experiments are performed by varying RAP content at four levels 10, 20, newline30 and 40 % and using four different rejuvenators (Waste Vegetable Oil, Waste Engine newlineOil, Waste Grease, and Palm Oil Sludge) and one solvent (Acetone). The performance newlineparameters evaluated in this research includes Marshall stability, moisture susceptibility newlinetests and fracture characteristics. Further, the interaction of RAP with different rejuvenators is evaluated through microstructural characterization. The results indicate that incorporation of RAP up to 20 % shows good resistance towards moisture and fracture, however, increase in the RAP content beyond 20 % damage those. It is concluded that 40 % of RAP content can be incorporated into SMA mixture with 6 % rejuvenator dosage. Overall, results confirm that 30 % of RAP content with 6 % rejuvenator dosage is an optimum combination to produce a superior performing