FATIGUE PERFOMANCE OF ASPHALTIC CONCRETE BINDER COURSE (AC̮̉̉̉BC) MIXES WITH SUBSTITUTED BUTON GRANULAR ASPHALT (BGA) 15/25 FROM LAWELE
Asphaltic concrete pavement layers tend to suffer from premature failure caused by traffic loadings. To improve the performance of the mixes and also to utilize local material it is postulated that Buton Granular Asphalt, as a partial substitution for bituminous material, can be effectife.<p>T...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/10360 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Asphaltic concrete pavement layers tend to suffer from premature failure caused by traffic loadings. To improve the performance of the mixes and also to utilize local material it is postulated that Buton Granular Asphalt, as a partial substitution for bituminous material, can be effectife.<p>The objective of this study is to evaluate in the laboratory the fatigue characteristics of asphaltic concrete binder course (AC-BC) mixes with partial substitution by Buton Granular Asphalt (BGA) type 15/25 from Lawele. The mixes are based on the 2007 specification for hot mixes, with pen 60/70 bitumen and the Marshall Method. At optimum binder content evaluations were performed for resistance to water, resilient modulus, and fatigue under controlled stress. Three types of mix sets were studied, i.e. without BGA (BGA-0), with a BGA subtitutionof 5% (BGA-5) and 10% (BGA-10) of total weight of mix. For each substitution level the contribution of BGA aggregates was carefully incorporated into the overall gradation requirement.<p>For the BGA-0, BGA-5, and BGA-10 mixes the Optimum Bitument Content values are respectively 5.89%, 6.15%, and 6.87%. The Marshall Index of Retained Strength values are respectively 84.35%, 85.82%, and 89.73%. The Marshall Stability values are respectively 1066.81 Kg, 1201.35 Kg, and 1212.77 Kg. The resilient modulus values are respectively 929.3 Mpa, 1249 Mpa, and 1364 Mpa. Thus all the values increase with the increase in substitution by BGA. But, the VIM and VMA levels also increase.<p>The partial substitution with BGA also produce a better fatigue performance as indicated by initial stiffness (Eo), crack initiation life (Ni), fatigue life (Nf), cycles of crack propagation (Np), and rate of crack propagation (rp) results. Also, at stress levels of 0.1 kN, 0.15 kN, and 0.20 kN The Effectiveness Factor (EF) value of BGA-5 are respectively 1.51, 0.88, and 0.98, and for BGA-10 the values are respectively 1.94, 1.39, and 1.68. The values for BGA-10 mixes are thus higher than those for the BGA-5 mixes. <p>The study result indicate that the partial substitution with BGA improve the performance of the mixes, and also increase the fatigue life. It is recomended to investigate substitution levels between 5% and 10% to identify an optimum level. Curing of the mixes has also to be specially investigated. <br />
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