Abstract
A better understanding of the interaction between old and new bitumen is considered of key importance in the production of new hot asphalt mixtures with high percentages of reclaimed asphalt pavement. This improvement could potentially avoid shorter service life of the material and failure due to reduced performance in rutting and fatigue. This study is part of an on-going research in the framework of a PhD thesis. The aim of this paper is to present the experimental results focussed on the characterisation of the diffusion phenomenon between two different bitumens. A DSR has been used to experimentally measure the changes in shear complex modulus during time at 50 °C of a double-layer specimen. The main hypothesis is that a changing in the measurements of the shear complex modulus is stemmed from a changing in the structure of the sample: this implies that a blending phenomenon between the two bitumens is going on, mainly driven by diffusion between the two materials.
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Acknowledgement
We thank Mr. Paolini Massimo from the company Valli Zabban Spa for the support and for the provision of the bitumens.
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Noto, S., Mangiafico, S., Romeo, E., Sauzéat, C., Di Benedetto, H., Tebaldi, G. (2022). Experimental Tests on Diffusion Phenomenon Between Two Different Bitumens. 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_114
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DOI: https://doi.org/10.1007/978-3-030-46455-4_114
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