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A platform for research: civil engineering, architecture and urbanism
Investigating the fatigue endurance limit of HMA mixture using RDEC approach
Highlights Dissipated energy remains almost constant in significant portion of loading cycles at low strain tests. The fatigue endurance limit value depends on the properties of hot mix asphalt mixture, test type and analysis method. There is a transition point in semi log strain–Nf50 curve when the curve is regressed using the power law relation.
Abstract The endurance limit is level of strain below which fatigue damage does not occur for any number of load repetitions. The evaluation and the determination of the fatigue endurance limit requires for testing at low strain levels. Various extrapolation methods were presented for the determination of fatigue lives at low strain levels. In this research study, the four point beam fatigue tests were conducted in accordance with AASHTO T321 using a semi sinusoidal loading at 10Hz for 70, 150, 200, 250, 400, 700 and 1000microstrain levels. The test data were investigated via the RDEC approach and PV–Nf50 unique relationship to obtain the fatigue endurance limit. The results showed that there is a transition point in semi log strain–Nf50 curve when the curve is regressed using the power law relation. The results also showed that the number of load cycles corresponding to transition strain (endurance limit) is different with load cycles corresponding to PVL (1.1E+7).
Investigating the fatigue endurance limit of HMA mixture using RDEC approach
Highlights Dissipated energy remains almost constant in significant portion of loading cycles at low strain tests. The fatigue endurance limit value depends on the properties of hot mix asphalt mixture, test type and analysis method. There is a transition point in semi log strain–Nf50 curve when the curve is regressed using the power law relation.
Abstract The endurance limit is level of strain below which fatigue damage does not occur for any number of load repetitions. The evaluation and the determination of the fatigue endurance limit requires for testing at low strain levels. Various extrapolation methods were presented for the determination of fatigue lives at low strain levels. In this research study, the four point beam fatigue tests were conducted in accordance with AASHTO T321 using a semi sinusoidal loading at 10Hz for 70, 150, 200, 250, 400, 700 and 1000microstrain levels. The test data were investigated via the RDEC approach and PV–Nf50 unique relationship to obtain the fatigue endurance limit. The results showed that there is a transition point in semi log strain–Nf50 curve when the curve is regressed using the power law relation. The results also showed that the number of load cycles corresponding to transition strain (endurance limit) is different with load cycles corresponding to PVL (1.1E+7).
Investigating the fatigue endurance limit of HMA mixture using RDEC approach
Khavandi Khiavi, Alireza (author) / Ameri, Mahmoud (author)
Construction and Building Materials ; 55 ; 97-102
2014-01-10
6 pages
Article (Journal)
Electronic Resource
English
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