Particle-scale interaction in sand-rubber mixtures and their influence on energy dissipation mechanisms

Fonseca, Joana; Riaz, Atif; Bernal-Sanchez, Juan; Barreto Gonzalez, Daniel; McDougall, John; Miranda Manzanares, Marina; Marinelli, Aikaterini; Dimitriadi, Vicky

Abstract

Sand-rubber mixture (SRm) behaviour is affected by rubber content (RC) whilst dissipation in sands is caused by inter-particle sliding. Dissipation in SRm is as, or more significant than in sands. However, the mechanisms of dissipation in SRm are not well understood. In this study, one-dimensional compression tests on sand samples with RC of 0%, 15%, 30%, 45% and 100% by mass were performed on a standard oedometer. In addition, a SRm with RC of 30% was tested on a minioedometer placed inside an X-ray scanner and 3D images of the internal structure of the material were acquired at three stages during loading and unloading. Image analysis was used to infer particle-scale measurements and provide experimental evidence to help explaining the energy dissipation mechanisms for SRm. It is
postulated here that energy dissipation in these mixtures is dominated by inter-particle sliding at initial stages of loading, but once rubber particles fill the voids spaces between the sand, deformation and dissipation mechanisms are dominated by the
deformation of the rubber particles.

Citation

Fonseca, J., Riaz, A., Bernal-Sanchez, J., Barreto Gonzalez, D., McDougall, J., Miranda Manzanares, M., Marinelli, A., & Dimitriadi, V. (2019). Particle-scale interaction in sand-rubber mixtures and their influence on energy dissipation mechanisms. Géotechnique Letters, 9(4), 1-6. https://doi.org/10.1680/jgele.18.00221

• Journal Article Type: Article
• Acceptance Date: Mar 3, 2019
• Online Publication Date: Apr 30, 2019
• Publication Date: 2019-12
• Deposit Date: Mar 4, 2019
• Publicly Available Date: Mar 6, 2019
• Journal: Géotechnique Letters
• Electronic ISSN: 2045-2543
• Publisher: ICE Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 4
• Pages: 1-6
• DOI: https://doi.org/10.1680/jgele.18.00221
• Keywords: Fabric/structure of soils; Particle-scale behaviour; Sand–rubber mixtures; Compressibility; Microscopy; Laboratory tests
• Public URL: http://researchrepository.napier.ac.uk/Output/1635100
• Contract Date: Mar 4, 2019