Abstract
Poroelastic Road Surfaces (PERS) are characterised by porous structure with air void content of 20% or higher and stiffness almost 10 times lower than that of a standard asphalt course. Such properties enable noise reduction by up to 12 dB in comparison to SMA 11 mixture. However, the disadvantage of a poroelastic pavement is its low durability, which partially results from delamination from the lower layer. The paper aims to investigate the effect of type and amount of tack coat used as well as the texture of the lower layer on interlayer bonding, to better recognise the issue of bonding under the poroelastic layer. For this purpose, direct shear test with monotonic and cyclic load was performed for 44 types of layer interfaces. The effect of type and amount of bituminous emulsion used for tack coat as well as the impact of lower layer surface were distinguished. The results of the analysis indicated that tack coats made from softer residual bitumen (70/100) exhibited better fatigue resistance, while polymer modification had minor effect. Moreover, milling of the lower layer resulted in a significant increase in shear strength. Finally, several types of layer interfaces were selected to be constructed in the full-scale test sections.
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Acknowledgments
Research work reported in this article was sponsored by the Polish National Centre for Research and Development (NCBiR) under the project SEPOR (Grant TECHMATSTRATEG 1/347040/17/NCBR/2018).
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Jaskula, P., Stienss, M., Szydlowski, C., Rys, D. (2022). The Use of Direct Shear Test for Optimization of Interlayer Bonding Under a Poroelastic Layer. In: Di Benedetto, H., Baaj, H., Chailleux, E., Tebaldi, G., Sauzéat, C., Mangiafico, S. (eds) Proceedings of the RILEM International Symposium on Bituminous Materials. ISBM 2020. RILEM Bookseries, vol 27. Springer, Cham. https://doi.org/10.1007/978-3-030-46455-4_234
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DOI: https://doi.org/10.1007/978-3-030-46455-4_234
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