UTILIZATION OF CRUMB RUBBER AS AN ADDITIVE TO ASPHALT MIXTURE IN ASPHALT CONCRETE (AC – BC) PAVEMENT

Highways are infrastructure for road users to move places smoothly and safely. Generally, the problem of highways is in the form of damaged and potholed highways. An innovation emerged to add crumb rubber to the asphalt mixture and is expected to improve the quality of the asphalt. Crumb rubber is a semi-finished material that comes from the recycling of used tire rubber. In this study, crumb rubber was used as an additive to the AC - BC (Asphalt Concrete - Binder Course) asphalt mixture. The purpose of this research is to determine the effect of adding crumb rubber to the AC - BC asphalt mixture which refers to the 2018 Revision 2 Bina Marga Specification.The research method used was the experimental method. The implementation of this research was carried out at the Highway Laboratory, Faculty of Engineering, Tanjungpura University Pontianak. The data obtained are data from marshall testing results in the form of stability, flow, marshall quotient, VIM, VMA, and VFB. The coarse aggregate used consisted of stone 1-1 and stone 05 from Peniraman, Mempawah Regency. The fine aggregates used were sand from Pontianak and stone ash from PT Sema. The asphalt used is asphalt pen. 60/70.The test specimens were made with 5%, 5.5%, 6%, 6.5%, 7% asphalt variations. The optimum asphalt content obtained is 6.1%—furthermore, the manufacture of test objects with the addition of crumb rubber at the optimum asphalt content. The levels of crumb rubber variations used were 0%, 2%, 4%, 6%, 8%, 10%. Variations of crumb rubber content 0%, 2%, 4%, 6%, 8% meet the requirements of the marshall parameters. The highest stability value is found in the 4% crumb rubber variation of 948.48 kg. There was an increase in stability of 5.07% and an increase in flow of 16.30% when compared to asphalt mixtures without crumb rubber.Therefore, the addition of crumb rubber in the asphalt mixture (AC - BC) has an influence in improving marshall parameters even though it is not significant. Suggestions for further research can be carried out on other types of pavement.