THE EFFECT OF BUTON MODIFIED BITUMEN MODULUS ON ASPHALT CONCRETE – WEARING COURSE

• Main Author: TARUNA ZEGA (NIM: 26914309), RIZAK
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24053
• Institution: Institut Teknologi Bandung

The design methods of flexible pavement structures currently recognized two types <br /> <br /> <br /> of approaches: empirical methods and mechanistic methods. Mechanistic methods <br /> <br /> <br /> of pavement structural design have been developed over the past three decades. <br /> <br /> <br /> Since the 1970s, the characteristics of asphalt mixtures have begun to be understood <br /> <br /> <br /> in the presence of testing instruments that can directly measure the modulus value <br /> <br /> <br /> of a material such as the Direct Shear Rheometer (DSR) test kit and the Universal <br /> <br /> <br /> Material Testing Apparatus (UMATTA). <br /> <br /> <br /> The model used to calculate the bitumen stiffness modulus (Sbit) are the Van der <br /> <br /> <br /> Poel Nomogram and Ullidtz formula with certain limitations, whereas the <br /> <br /> <br /> mathematical model that can be used to calculate the stiffness modulus of asphalt <br /> <br /> <br /> mixture (Smix) is Bonnaure et.al (1977), Asphalt Institute method (1982) and <br /> <br /> <br /> Nottingham method (Brown, et al., 1984). This study attempts a new contribution <br /> <br /> <br /> to the sequence of asbuton research, where the study aims to validate the model <br /> <br /> <br /> used for unmodified bitumen and compare it with modified bitumen with asbuton. <br /> <br /> <br /> The bitumen stiffness modulus (Sbit) is in addition influenced by changes in <br /> <br /> <br /> temperature and loading time received by bitumen, also depending on the type of <br /> <br /> <br /> bitumen used and the type of modification performed both for the improvement of <br /> <br /> <br /> rheological properties and mechanistic properties of bitumen. The modification is <br /> <br /> <br /> of course expected to also contribute to improving the modulus value (Smix) of <br /> <br /> <br /> asphalt mixture using modified bitumen, which in this study the modification is by <br /> <br /> <br /> adding pure extraction of asbuton by 8% weight of bitumen. <br /> <br /> <br /> The Van der Poel model tends to be more suitable for use in determining the Sbit <br /> <br /> <br /> value by adjusting for its value in order to approximate the Sbit value of the DSR <br /> <br /> <br /> test. Asphalt Institute model is more recommended to be used in determining the <br /> <br /> <br /> value of Smix due to the resulting Smix value tend to be consistent to high <br /> <br /> <br /> temperature changes.