FATIGUE PERFORMANCE OF HRA (HOT ROLLED ASPHALT) AND SUPERPAVE® MIXES USING INDONESIAN ROCK ASPHALT (ASBUTON) AS FINE AGGREGATES AND FILLER

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Pursuing our previous research, the fatigue performance of Hot Rolled Asphalt (HRA) mix type C; referred to the British Standard Specification, and Superpave® Asphaltic Concrete (AC) mix; referred to the Asphalt Institute Specification, both using an ASBUTON (Indonesian Rock Asphalt) as fine aggregates and filler, were investigated. The parameters used to evaluate the fatigue characteristics of Asphalt Concrete mixes were: the number of cycles to failure or Fatigue Life, the Effectiveness Factor, the initial strain, the initial stiffness, the number of cycles for crack initiation, the number of cycles for crack propagation, and the cracking mechanism until failure achieved.
The results of the research showed that the use of Asbuton as fine aggregates and filler in HRA mix type C and Superpave® AC mixtures, could improve its Fatigue Life, indicated by an increasing of the Effectiveness Factor, i.e. the ratio of number of cycle to failure for specimens with and without Asbuton filler, at a given stress level, ranges from 15.71 to 4.90 for HRA mix and from 521.44 to 6.38 for AC mix, depend on its stress level.. The role of Asbuton filler in both asphalt mixture; HRA and AC appears also to decrease the Initial Strain, increase the Initial Stiffness (more than 300% for AC mix) and reduce the mechanism of crack initiation and crack propagation of the specimens.