Sustainable asphalt materials: mechanistic-empirical design and economic evaluation of natural rubber latex-modified asphalt mixtures

Abstract

Using natural rubber latex (NRL) as a sustainable material has gained significant attention owing to its potential to reduce environmental impacts. At a laboratory test scale, NRL, as a biopolymer, has been proven in increasing resistance to permanent deformation and fatigue cracking. However, comprehensive research has yet to be published on how NRL impacts the long-term performance of the pavement. Furthermore, it is crucial to consider the long-term financial viability of asphalt mixtures utilized in transportation infrastructure. Accordingly, this paper aims to evaluate the long-term performance of NRL-modified asphalt pavement by following the MEPDG and its economic aspect using life cycle cost analysis (LCCA). The results show that the method predicts that NRL will significantly reduce permanent deformation compared with unmodified asphalt over a 60-year service period. In terms of LCCA, the NRL section exhibits the most economical total cost in comparison with the unmodified and SBS pavement sections.