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Estimation of Fatigue Damage in Bituminous Mixes Using Digital Image Processing
Fatigue cracking, a major type of failure in bituminous mixes, is caused by the accumulation of damage due to the repeated application of traffic loads. To understand this phenomenon clearly, it is necessary to quantify material damage in terms of an appropriate parameter. Crack length is typically used as a measure of damage. This study explores the suitability of crack area as a damage parameter and examines the crack area growth patterns of two different bituminous mixes prepared using VG40 and PMB40 binders. Indirect tensile fatigue test (ITFT) was conducted on the specimens of mixes at three different stress levels and two different test temperatures, 25 and 35 °C, to characterize their fatigue behavior. Digital image processing (DIP) approach was used to estimate the progression of the crack area with the number of load repetitions. It is observed that the crack area grows exponentially with the number of load repetitions. The crack area growth models developed in this study indicate that the rate of damage accumulation is affected by the characteristics of mix components. These models can be used to calculate the consumed fatigue life based on the crack area measurement. Results also show that the crack area growth rate is higher at a higher temperature and the crack area in mixes with unmodified binder increases at a faster rate than in mixes with modified binder.
Estimation of Fatigue Damage in Bituminous Mixes Using Digital Image Processing
Fatigue cracking, a major type of failure in bituminous mixes, is caused by the accumulation of damage due to the repeated application of traffic loads. To understand this phenomenon clearly, it is necessary to quantify material damage in terms of an appropriate parameter. Crack length is typically used as a measure of damage. This study explores the suitability of crack area as a damage parameter and examines the crack area growth patterns of two different bituminous mixes prepared using VG40 and PMB40 binders. Indirect tensile fatigue test (ITFT) was conducted on the specimens of mixes at three different stress levels and two different test temperatures, 25 and 35 °C, to characterize their fatigue behavior. Digital image processing (DIP) approach was used to estimate the progression of the crack area with the number of load repetitions. It is observed that the crack area grows exponentially with the number of load repetitions. The crack area growth models developed in this study indicate that the rate of damage accumulation is affected by the characteristics of mix components. These models can be used to calculate the consumed fatigue life based on the crack area measurement. Results also show that the crack area growth rate is higher at a higher temperature and the crack area in mixes with unmodified binder increases at a faster rate than in mixes with modified binder.
Estimation of Fatigue Damage in Bituminous Mixes Using Digital Image Processing
RILEM Bookseries
Di Benedetto, Hervé (editor) / Baaj, Hassan (editor) / Chailleux, Emmanuel (editor) / Tebaldi, Gabriele (editor) / Sauzéat, Cédric (editor) / Mangiafico, Salvatore (editor) / Modi, Shubham (author) / Tavva, Tejaswini Lakshmi (author) / Chowdhury, Priyadarshini Saha (author) / Kusam, Sudhakar Reddy (author)
RILEM International Symposium on Bituminous Materials ; 2020 ; Lyon, France
Proceedings of the RILEM International Symposium on Bituminous Materials ; Chapter: 93 ; 733-739
RILEM Bookseries ; 27
2021-09-26
7 pages
Article/Chapter (Book)
Electronic Resource
English
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