The Characteristics of The Asphalt Concrete Wearing Course (AC-WC) Using SIR20 Solid Rubber Compound

Abstract

Mixing natural rubber with asphalt can improve asphalt performance resistance to cracks and increase asphalt attachment to aggregates. The latex type is a natural rubber that can be directly used as an additive in asphalt mixture. Mixing asphalt with natural rubber and latex type in solid forms such as Standard Indonesian Rubber (SIR) should be made first in rubber asphalt master mixture (called masterbatch). So that the mixture is more homogeneous, making it more accessible in the process of mixing into the asphalt. This study aims to determine the characteristics of the Asphalt Concrete Wearing Course (AC-WC) using SIR 20 solid-rubber compound in the form of a masterbatch. This research began with the manufacture of masterbatch, which is mixing SIR 20 solid-rubber compound and asphalt into a kneader machine with a ratio of 1:1. It is then formed into a black sheet using an open mill machine, after which it is inserted into the enumerator machine to produce small cylindrical granules measuring 5 mm. Then the masterbatch granules are included in the asphalt mixture with some variations of asphalt content to obtain the Optimum Asphalt Content (OAC) value. Based on the OAC value, test objects made with several SIR 20 solid-rubber compound content variations. The Marshall test has conducted to determine the value of stability and flow. Based on the optimum contents obtained, test objects are created for Wheel Tracking Machine (WTM) testing to determine the value of dynamic stabilities. From the results of this study, it is known that the use of SIR 20 solid rubber compounds in the form of masterbatch can improve the performance of AC-WC concrete asphalt mixtures, with the optimum SIR 20 solid rubber compound content of 7%.