CHARACTERISTICS OF ASPHALT CONCRETE WEARING COURSE MIX INCORPORATING RECYCLED TIRE RUBBER AS AN ADDITIVE

Abstract

In Indonesia, flexible pavement is the primary form of road infrastructure. It is typically produced using a binder combined with Buton Granular Asphalt (BGA B 5/20) as an additional binder. Tire rubber waste as an additive is considered an option to reduce environmental pollution and promote sustainable procurement strategies. The objective of this study is to evaluate the results of the Marshall characteristic test for an asphalt concrete wearing course (AC-WC) with tire rubber used as an asphalt binder. Three AC-WC mixtures (0%, 5%, and 10%) were subjected to Marshall characteristic tests. The results of the Marshall stability test showed that the untreated AC-WC mixture had a stability of 1312 kg, while the AC-WC mixture with 5% tire rubber had a stability of 1150 kg, indicating a reduction of 12.3%. Similarly, the 10% tire rubber demonstrated a stability of 1100 kg, reflecting a reduction of 16.2%. The Marshall Quotient for the standard AC-WC mixture was 416.9 kg/mm. In contrast, the 5% tire rubber yielded a Quotient of 354 kg/mm, representing a decrease of 15.1%. Additionally, the 10% tire rubber resulted in a Quotient of 289.4 kg/mm, indicating a reduction of 30.1%. The Marshall characteristics VMA, VIM, VFB, and Flow also met the standard criteria for AC-WC. The addition of tire rubber reduced the bearing capacity and resistance to permanent deformation of the AC-WC. However, it was observed that tire rubber waste can be effectively used as an additional binder for asphalt in AC-WC treatment.