MECHANISTIC PERFORMANCE EVALUATION OF STONE MATRIX ASPHALT (SMA) USING SEMIEXTRACTIONS ASBUTON BNA BLEND PG70 AND CELLULOSE

• Main Author: Putri Ariansyah, Aida
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/73019
• Institution: Institut Teknologi Bandung

Vital role of road infrastructure might be supported by its quality which is the key to serve reliability in carrying high traffic demand. Indonesia has adopted the type of asphalt mixture called Stone Matrix Asphalt (SMA) which has better characteristics in resisting aging properties because it has a fairly high bitumen content and more coarse aggregate. Higher bitumen content than a conventional asphalt mixture causes SMA more susceptible to asphalt bleeding. So it requires stabilizers to hold the bitumen firmly. By using modification bitumen is also expected to improve the binder’s properties to provide good support to the SMA mixture. Semi-extraction Asbuton is kind of modification bitumen that is claimed to improve stability, deformation resistance, fatigue resistance, and water impermeability. The use in SMA mixture research is expected to improve the quality and performance of SMA mixture itself so that the semiextraction asbuton can be well-utilized in the future. The type of SMA mixture used in this research is “SMA halus” based on the Indonesia General Specifications for Highways 2018 2nd Rev. in which the nominal maximum aggregate size (NMAS) is 12.5 mm. Binder material used in this research is Aspal Pen 60/70 and Semi-extraction Asbuton BNA Blend which varies with the addition of cellulose fiber called Viatop66. The properties of both binders are compared, whereas the properties of mixture obtained by laboratorium test such as volumetric tes using Superpave Gyratory Compactor (SGC), binder draindown, Indirect Tensile Strength, Modulus Resilient using UMATTA, and fatigue resistance by using 4-Point Bending method. Test result shows the properties of Semiextraction Asbuton is harder than Aspal Pen 60/70 in room temperature. The volumetric test using SGC shows the SMA mixture with the addition of cellulose fiber need higher binder content to obtain desireable volumetric criteria. While binder draindown test shows the variation of SMA mixture without the addition of cellulose fiber is more susceptible to bleeding eventhough the value of draindown test in all three varians mixture are far below the maximum allowable draindown value. The SMA mixture with addition of cellulose fiber (BNAV) has higher bitumen film thickness than others. It is proven with the value of Indirect Tensile Strength (ITS) test which provide the best tensile strength i.e. 1002.03 kPa (dry) and 816.90 kPa (soaked). In line with the fatigue iv test where the BNAV has resistant to fatigue crack in 139240 cycle on controlled strain 750??. Resilient Modulus test shows that the value decrease as the temperature increase. The SMA mixture using Semiextraction Asbuton BNA Blend without the addition of cellulose fiber (BNA) provide higher Modulus Resilient value on 25°C and 45°C which is the BNA is stiffer. In general, the use of Semiextraction Abuton BNA Blend as binder in SMA mixture shows better improvement in mixture’s mechanistic performance than Aspal Pen 60/70 so that this mixture could be alternative solution to obtain better qualities of asphalt mixture which has better stability, flexibility, and durability.