Asphalt Concrete – Wearing Course (Ac-Wc) With Crumb Rubber Mixture Performance Evaluation

Abstract

This study aims is to measure the performance of a mixture of Asphalt Concrete - Wearing Course (AC-WC) with addition of crumb rubber using a dry process, where crumb rubber as an aggregate substitution of fraction no. 50 with a mixture variation of 0%, 25%, and 50%. The method used in this research is the experimental method in the laboratory. Primary data collection is done through testing of aggregates, asphalt, crumb rubber, and mixtures. Hot mix design used Marshall test to obtain Optimum Bitumen Content (OBC). Laboratory test in OBC conditions obtain consist of Resilient Modulus test used Dynamic Testing System (DTS) at 25°C, 35°C, and 45°C and rut depth test used Hamburg Wheel Tracking (HWT) at temperatures 45°C and 60°C. The results of addition of crumb rubber content to the mixture can increase the value of OBC and reduce the value of Marshall stability, the percentage of 50% crumb rubber obtained highest OBC and the lowest Marshall stability. The crumb rubber content in the mixture lowers the value of Modulus Resilient, AC-WC with 0% crumb rubber has the highest value. At a temperature of 60°C, 25% crumb rubber content in the mixture reduces the rut depth value. Based on the Marshall stability, Resilient Modulus, and rut depth values, then the crumb rubber content to replace aggregate fraction no. 50 in the AC-WC gives the highest value is 25% in laboratory test

Keywords

• ac-wc
• crumb rubber
• resilient modulus
• hamburg wheel tracking