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Author(s): Rui Alexandre Lopes Baltazar Micaelo
Jaime Manuel Queirós Ribeiro
Title: Discrete element modelling of asphalt mixtures compaction
Issue Date: 2008
Abstract: Asphalt mixtures compaction is considered to be one of the most important factors that influence asphalt layersdurability, as has been shown by many studies in the past. However, it is still not clear how compaction should becarried out. In the present paper, a computer simulation based on the Distinct Element Method (DEM) is adopted tostudy this matter. Asphalt mixtures are modelled as an assemblage of circular rigid particles that interact with eachother at soft contact points based on DEM, using Itasca-PFC2D software. Up to this point, the influence of severalparameters has been investigated, namely the generation process, the assembly dimensions, the initial conditions, thetype of contact model, the material properties and the loading conditions. A mixture with median predictedcompactability, AC 0/16, was selected from the study "FGSV: Merkblatt für das Verdichten von Asphalt", 2004, inwhich the compactability of several kinds of asphalt mixtures were evaluated.The numerical model is initially validated against laboratory data (static compaction). As expected the Burger'scontact model is shown to give a better agreement than the obtained with an elastic contact model. The model has beenfurther improved with two different techniques. First a contact hardening effect was introduced as function of theparticle aspect ratio. Secondly, the formation of rigid bodies in the assembly was considered as result of the particlesoverlap. Both techniques proved to be useful. In accordance to the previous encouraging results one presents the fieldtests that were carried out to acquire the necessary data for the following simulations (roller compaction). Thepreparation procedure for the simulations is shown and the preliminary results presented. The initial results for thestatic roller compaction seem reasonable. It is shown that the presented study is a good insight in the complexbehaviour of asphalt mixtures compaction.
Subject: Engenharia civil
Civil engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia civil
Engineering and technology::Civil engineering
Document Type: Livro de Atas de Conferência Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Livro de Atas de Conferência Internacional

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