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Three-dimensional characterisation of particle size and shape for ballast

Journal Article


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Abstract


  • The size and shape of particles influence how effectively coarse angular aggregates of ballast

    interact. The aim of this study was to improve the characterisation of ballast particles using a threedimensional

    (3D) imaging method. Various size and shape indices, such as elongation ratio,

    sphericity and roundness, were determined from the scanned 3D images. A modified index called

    ‘ellipsoidness’ was proposed to capture adequately the shape of the 3D particles. Variation of these

    indices with particle size was studied. Comparison of the 3D true sphericity and the corresponding

    two-dimensional sphericity indicated that the latter would underestimate sphericity. A modified

    approach for transforming particle size distribution to constriction size distribution is proposed by

    capturing the size and shape effects of particles.

Publication Date


  • 2014

Citation


  • Sun, Y., Indraratna, B. & Nimbalkar, S. (2014). Three-dimensional characterisation of particle size and shape for ballast. Geotechnique Letters, 4 (3), 197-202.

Scopus Eid


  • 2-s2.0-84931094246

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3798&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2789

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 197

End Page


  • 202

Volume


  • 4

Issue


  • 3

Place Of Publication


  • United Kingdom

Abstract


  • The size and shape of particles influence how effectively coarse angular aggregates of ballast

    interact. The aim of this study was to improve the characterisation of ballast particles using a threedimensional

    (3D) imaging method. Various size and shape indices, such as elongation ratio,

    sphericity and roundness, were determined from the scanned 3D images. A modified index called

    ‘ellipsoidness’ was proposed to capture adequately the shape of the 3D particles. Variation of these

    indices with particle size was studied. Comparison of the 3D true sphericity and the corresponding

    two-dimensional sphericity indicated that the latter would underestimate sphericity. A modified

    approach for transforming particle size distribution to constriction size distribution is proposed by

    capturing the size and shape effects of particles.

Publication Date


  • 2014

Citation


  • Sun, Y., Indraratna, B. & Nimbalkar, S. (2014). Three-dimensional characterisation of particle size and shape for ballast. Geotechnique Letters, 4 (3), 197-202.

Scopus Eid


  • 2-s2.0-84931094246

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3798&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2789

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 197

End Page


  • 202

Volume


  • 4

Issue


  • 3

Place Of Publication


  • United Kingdom