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Experimental and numerical analyses of crushing resistance of unbound road materials
Department of Civil and Architectural Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.ORCID iD: 0000-0002-2449-4573
Department of Civil and Architectural Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.ORCID iD: 0000-0002-0596-228X
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Solid Mechanics.ORCID iD: 0000-0001-7674-8582
Department of Civil and Architectural Engineering, KTH Royal Institute of Technology, Stockholm, Sweden.ORCID iD: 0000-0002-1041-0244
2024 (English)In: The international journal of pavement engineering, ISSN 1029-8436, E-ISSN 1477-268X, Vol. 25, no 1, article id 2330630Article in journal (Refereed) Published
Abstract [en]

Aggregate breakage in unbound pavement layers can lead to pavement distresses that affect their functionality and service life. Thus understanding the mechanics and clarifying the factors affecting materials breakage resistance are important for ensuring adequate performance of these layers. In this study, aggregate breakage in unbound granular materials (UGM) is investigated experimentally and numerically. Experimentally, aggregate breakage under uniaxial compression is examined for two UGMs prepared with the same aggregate type but different gradations. To capture the experimentally observed influence of gradation and load magnitude on aggregate breakage, a Discrete Element Method (DEM) model was developed, based on granular mechanics particle contact and failure laws. A simple procedure to identify the contact and failure law parameters from experiments is proposed. With those parameters, the model’s capability of capturing the effect of gradation and loading on the aggregate breakage in UGM is evaluated. Based on comparison with experimental findings, it is shown that the model can capture macro-scale properties of UGM, such as its deformation response under uniaxial compression, as well as the amount of aggregate breakage in the material.

Place, publisher, year, edition, pages
Taylor & Francis, 2024. Vol. 25, no 1, article id 2330630
Keywords [en]
Unbound granular materials (UGM), aggregate breakage, discrete element method (DEM), gradation, contact mechanics
National Category
Infrastructure Engineering
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-104907DOI: 10.1080/10298436.2024.2330630OAI: oai:DiVA.org:ltu-104907DiVA, id: diva2:1847505
Note

Validerad;2024;Nivå 2;2024-03-28 (signyg);

Full text license: CC BY

Available from: 2024-03-28 Created: 2024-03-28 Last updated: 2024-04-03Bibliographically approved

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Olsson, Erik

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