Mechanical Performance of Reclaimed Asphalt Pavement Modified with Waste Frying Oil and Crumb Rubber

Abstract

Researchers are exploring the utilisation of reclaimed asphalt pavement (RAP) as a recycled material to determine the performance of non-renewable natural aggregates and other road products such as asphalt binder, in the construction and rehabilitation stage of asphalt pavements. The addition of RAP in asphalt mixtures is a complex process and there is a need to understand the design of the asphalt mixture. Some of the problems associated with adding RAP to asphalt mixtures are moisture damage and cracking damage caused by poor adhesion between the aggregates and asphalt binder. There is a need to add rejuvenators to the recycled mixture containing RAP to enhance its performance, excepting the rutting resistance. This study sought to improve asphalt mixture performance and mechanism by adding waste frying oil (WFO) and crumb rubber (CR) to 25 and 40% of the RAP content. Moreover, the utilisation of CR and WFO improved pavement sustainability and rutting performance. In addition, this study prepared five asphalt mixture samples and compared their stiffness, moisture damage and rutting resistance with the virgin asphalt. The results showed enhanced stiffness and rutting resistance of the RAP but lower moisture resistance. The addition of WFO and CR restored the RAP properties and produced rutting resistance, moisture damage and stiffness, which were comparable to the virgin asphalt mixture. All waste and virgin materials produce homogeneous asphalt mixtures, which influence the asphalt mixture performance. The addition of a high amount of WFO and a small amount of CR enhanced pavement sustainability and rutting performance.

Effects of Waste Frying Oil and Crumb Rubber on the Characteristics of a Reclaimed Asphalt Pavement Binder

“…The CR, retained in a 0.15 mm sieve (mesh 40) by the Miroad Rubber Industry, Johor, Malaysia, was used. This study conducted the penetration, softening point, ductility, and viscosity tests to determine the WFO and CR contents [30].…”

Research on the Fatigue Properties of Rejuvenated Asphalt Prepared by Waste Cooking Oil Pre-Desulfurized Crumb Tire Rubber

“…The crumb rubber and waste frying oil can restore the properties of RAP asphalt, especially its rheological properties, and also improve the compatibility and storage stability of RAP binder [ 17 ]. It was identified by Bilema et al [ 18 ] that waste frying oil could restore the mechanical properties such as the tensile strength ratio of recycled asphalt pavement, and crumb rubber could improve the rutting resistance of asphalt mixture, which are complementary to each other. Additionally, when pretreated with WCO at high temperatures, the three-dimensional network structure in crumb rubber is swollen and the interaction between rubber chains is weakened, which consequently leads to cross-linked bonds such as S-S and S-C with comparatively low bond energy being broken, and the soluble linear rubber molecular chains, carbon black fragments and other medium and small molecular weight substances are released [ 16 , 19 ].…”

Effects of Rejuvenator Dosage, Temperature, RAP Content and Rejuvenation Process on the Road Performance of Recycled Asphalt Mixture

“…In addition, it was observed that appropriate RAP content has a significant effect on the performance of hot recycled asphalt mixture [23][24][25][26][27]. Bilema, M. et al [28] concluded that this enhanced stiffness and rutting resistance of the RAP but lowered moisture resistance, and the pavement sustainability and rutting performance of RAP could be restored by adding WFO and CR. Yin, P. et al [29] found that with the addition of RAP, high-temperature performance of HRAM increased and the low-temperature performance and moisture susceptibility decreased.…”