Full extraction of asbuton bitumen for binder replacement in warm mix asphalt

Abstract

Asbuton can be utilized as an optional binder in asphalt mixture by semi-extraction or full extraction. Full extraction of asbuton by using solvent can maximize the content of bitumen while discarding the mineral. However, different solvent content influenced the asbuton bitumen properties. Thus, this study evaluated the effect of different percentages of toluene solvent on the full extraction. Four different percentages of solvent content 1 to 4 % of toluene were used in this study. The asbuton bitumen was then tested for penetration, softening point, flash point, specific gravity, and thin film oven test. The asbuton bitumen was then used to design warm mix asphalt (WMA). Based on the Marshall mix design, the optimum bitumen content (OBC) is 6.25 %. The WMA with full extraction asbuton bitumen fulfilled the Marshall requirement by stability of 1374 kg, and 96.97% retained stability. It also produced 3.57 mm flow with 3.46 % void in mix, 15.08 % void mineral aggregatte, and 76.41 of void filled bitumen. As a result, it is discovered that full extraction asbuton can serving as the WMA binder replacement.