PERFORMANCE ANALYSIS OF OPEN GRADED FRICTION COURSE (OGFC) MIXTURE USING POLYMER MODIFIED BITUMEN AND BUTON ROCK ASPHALT

• Main Author: Andriansyah
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/72891
• Institution: Institut Teknologi Bandung

This research was conducted to analyze the effect of using Buton rock asphalt and polymer modified asphalt in improving the performance of OGFC. The evaluated performance is classified as structural and functional performance. The structural performance of OGFC was evaluated through cantabro abrasion, asphalt draindown, Marshall stability, resilient modulus, fatigue resistance, rut resistance, and dynamic stability. While the functional performance of OGFC was evaluated through voids in the mix (VIM) and coefficient of permeability. Two types of OGFC mixtures were analyzed referring to ASTM D7064/D7064 M. The OGFC mixtures analyzed were mixtures with Buton rock asphalt full extraction and polymer modified bitumen. To obtain the optimum asphalt content (OAC), VIM, Cantabro Abrasion, and Asphalt Draindown tests were conducted at 5%, 5.5%, and 6% asphalt content. Advanced tests were conducted on the OAC specimens, including Marshall stability, resilient modulus at 25oC, 35oC and 41oC with Universal Testing Machine (UTM), fatigue resistance with Indirect Tensile Fatigue Test (ITFT) method, rut resistance and dynamic stability with Hamburg Wheel Tracking Device (HWTD), and permeability. Based on the results, shown that OGFC with Buton rock asphalt has lower abrasion resistance and dynamic stability. In addition, OGFC with Buton rock asphalt has a higher stiffness modulus of the mixture, which improves the fatigue resistance of OGFC. Based on the results of VIM, permeability, and Marshall stability tests, the two OGFC mixtures do not have significant differences, where for VIM values of these two mixtures around 20%, permeability around 330 m/day, and Marshall stability around 550 kg. Generally, the OGFC with Buton rock asphalt resulted better structural performance than OGFC with polymer modified bitumen. The Marshal stability test results of OGFC mixtures show that these mixtures cannot be used as a structural layer.