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Modelling the flow of asphalt under simulated compaction using discrete element
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials. VTI Swedish National road and transport research institute, Olaus Magnus väg 35, Linköping, 583 30, Sweden.ORCID iD: 0000-0002-5526-5896
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-1041-0244
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-0596-228X
2019 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 227, article id 116432Article in journal (Refereed) Published
Abstract [en]

The flow differences between the particles of asphalt mixtures compacted in the laboratory and in the field have been identified as one of the reasons for the discrepancies between laboratory and field results. In previous studies, the authors developed a simplified test method, the so-called compaction flow test (CFT), for roughly simulating the flow of particles in asphalt mixtures under compacting loads in laboratory. The CFT was used in different studies to examine its capability of revealing the differences between the flow behavior of different asphalt mixtures under various loading modes. The promising results encouraged further development of the CFT by investigating the possible impacts of simplifications and boundary conditions on the results of this test. For this reason, discrete element method (DEM) was utilized to investigate possible impacts of the mold size, geometry of the loading strip as well as the loading rate on the results of the CFT. The results of the simulation indicate that in case of wearing course layers with nominal maximum aggregate size of 11 mm, the length of the CFT mold can be increased from 150 mm to 200–250 mm for reducing flow disturbances from the mold walls. However, since the majority of the flow of asphalt mixture particles is expected to take place within the first 100–150 mm length of the mold, reasonable results can still be obtained even without changing the size of the CFT mold. Moreover, comparing results with different loading strip geometries and loading rates indicates that the current CFT setup still appears to provide consistent results.

Place, publisher, year, edition, pages
Elsevier Ltd , 2019. Vol. 227, article id 116432
Keywords [en]
Asphalt compaction, Boundaries, Compaction flow test, Discrete element, Compaction, Finite difference method, Mixtures, Molds, Semiconductor insulator boundaries, Testing, Flow behaviors, Flow disturbances, Flow of particles, Flow tests, Loading strips, Maximum aggregate sizes, Simplified test, Wearing course, Asphalt mixtures
National Category
Building Technologies Other Materials Engineering
Research subject
Materials Science and Engineering; Civil and Architectural Engineering, Building Materials
Identifiers
URN: urn:nbn:se:kth:diva-263465DOI: 10.1016/j.conbuildmat.2019.07.158ISI: 000496830500013Scopus ID: 2-s2.0-85070383471OAI: oai:DiVA.org:kth-263465DiVA, id: diva2:1375457
Note

QC 20191205

Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2020-01-07Bibliographically approved

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Ghafoori Roozbahany, EhsanPartl, ManfredElaguine, Denis

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