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Discrete element modelling of creep of asphalt mixtures

Cai, Wei; McDowell, Glenn R.; Airey, Gordon; de Bono, John P.

Authors

Wei Cai

Glenn R. McDowell glenn.mcdowell@nottingham.ac.uk

Gordon Airey gordon.airey@nottingham.ac.uk

John P. de Bono john.debono@nottingham.ac.uk



Abstract

Creep tests on asphalt mixtures have been undertaken under four stress levels in the laboratory while the Discrete Element Model (DEM) has been used to simulate the laboratory tests. A modified Burger’s model has been used to represent the time-dependent behaviour of an asphalt mixture by adding time-dependent moment and torsional resistance at contacts. Parameters were chosen to give the correct stress-strain response for constant strain rate tests in Cai et al. (2013) . The stress-strain response for the laboratory creep tests and the simulations were recorded. The DEM results show reasonable agreement with the experiments. The creep simulation results proved to be dependent on both bond strength variability and positions of the particles. Bond breakage was recorded during the simulations and used to investigate the micro-mechanical deformation behaviour of the asphalt mixtures. An approach based on dimensional analysis is also presented in this paper to reduce the computational time during the creep simulation, and this analysis is also a new contribution.

Journal Article Type Article
Journal Geomechanics and Geoengineering
Print ISSN 1748-6025
Electronic ISSN 1748-6033
Publisher Taylor & Francis
Peer Reviewed Peer Reviewed
Volume 11
Issue 1
APA6 Citation Cai, W., McDowell, G. R., Airey, G., & de Bono, J. P. (in press). Discrete element modelling of creep of asphalt mixtures. Geomechanics and Geoengineering, 11(1), doi:10.1080/17486025.2015.1006689
DOI https://doi.org/10.1080/17486025.2015.1006689
Keywords discrete element modelling, asphalt, creep, fracture
Publisher URL http://www.tandfonline.com/doi/full/10.1080/17486025.2015.1006689
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information “This is an Accepted Manuscript of an article published by Taylor & Francis Group in Geomechanics and Geoengineering on 24/02/2015, available online: http://www.tandfonline..../17486025.2015.1006689.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf



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