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Published in:
2022 | OriginalPaper | Chapter
Experimental Evaluation of Swelling and Absorption of Crumb Rubber Aggregates
Authors : Yasmina Mahmoudi, Salvatore Mangiafico, Cédric Sauzéat, Hervé Di Benedetto, Simon Pouget, Frédéric Loup, Jean-Philippe Faure
Published in: Proceedings of the RILEM International Symposium on Bituminous Materials
Publisher: Springer International Publishing
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Abstract
Rubber from end-of-life tires can be recycled by incorporating them into bituminous mixtures as a replacement of a part of the mineral aggregates (dry process) or as a bitumen modifier (wet process). Even in the dry process, interactions between Crumb Rubber (CR) aggregates and bitumen may occur during the mixing process and beyond, causing CR aggregates to swell and absorb aromatic fractions of bitumen at the same time. This study focuses on the experimental evaluation of swelling and aromatic oil absorption of CR aggregates. CR aggregates with a continuous 4/8 mm grain size distribution were immerged in a pycnometer full of aromatic oil whose composition is close to aromatics in bitumen. The volume of oil absorbed by CR aggregates, the grading curve and the volume of CR aggregates were determined both immediately after the immersion and after 48 h of immersion. Experimental data show that CR aggregates swell and absorb aromatic oil.