Abstract
In this paper the possibility of using photoelasticity to visualize and evaluate deformation and crack propagation on the surface of asphalt mixture is investigated. This technique uses a reflection polariscope which also allows to identify strain patterns. Six asphalt mixtures commonly used in Germany for base (AC 22), binder (AC 16) and surface (AC 8) layers were selected for performing monotonic and fatigue tests on notched semi-circular bending specimens, under constant strain rate and cyclic loading, respectively. Deformations were recorded through a digital camera capable of acquiring 30 images per second; for fatigue tests, pictures were taken every two seconds. During monotonic testing, very little deformation on the specimen surface could be visualized as load increased. As peak load was reached, cracking occurred suddenly, suggesting a typical quasi-brittle behavior; nevertheless, crack propagation could be recorded. Fatigue tests showed similar trend, but over a longer time. Cracking appeared at the end of the tests and needed an additional number of load cycles to reach complete failure.
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Acknowledgments
The authors gratefully acknowledge the funding support of Federal Ministry of Transport, Building and Urban Development under the research grant FE 09/0189/2011/ERB “Numerische Simulation der Rissausbreitung in flexiblen Asphaltbefestigungen Infolge von Verkehrslasten, Teil II”.
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Büchler, S., Wistuba, M., Cannone Falchetto, A. (2016). Evaluation of Crack Propagation in Asphalt Mixture Through Photoelasticity. In: Canestrari, F., Partl, M. (eds) 8th RILEM International Symposium on Testing and Characterization of Sustainable and Innovative Bituminous Materials. RILEM Bookseries, vol 11. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-7342-3_82
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DOI: https://doi.org/10.1007/978-94-017-7342-3_82
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