Performance of asphaltic concrete incorporating SBR subjected to aging

Abstract

The influence of styrene butadiene rubber (SBR) on asphaltic concrete properties at different aging condition presented in this study. These aging conditions are named as un-aging, short-term and long-term. The conventional asphalt binder of penetration grade 60/70 was used within this work, modified with styrene butadiene rubber (SBR) at four different modification levels namely 0%, 1%, 3%, and 5% by weight binder. Asphalt concrete mixes were prepared at selected optimum asphalt content (5.0%) and then tested to evaluate their mechanical properties which include Marshall stability, resilient modulus and dynamic creep tests. From the experimental results, the findings showed that the mixes modified with SBR polymer have an improved stability and permanent deformation characteristics under aging conditions. The result also showed that the stability, resilient modulus and dynamic creep tests under long term aging is the highest among than that of the short term and un-aged. The use of 5 percent SBR has added to local knowledge the ability to produce more durable asphalt concrete mixtures with better serviceability.