Micro X-ray Computed Tomography Image-based Two-scale Homogenisation of Ultra High Performance Fibre Reinforced Concrete

Ansam Qsymah, R. Sharma, Z. Yang, Lee Margetts, Paul Mummery

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    Abstract

    A two-scale analytical-numerical homogenisation approach is developed to predict effective elastic properties of ultra high performance fibre reinforced concrete considering distribution of pore sizes acquired from 3D micro X-ray computed tomography (μXCT) images of 24.8 μm resolution. In the first scale, the mortar, consisting of sand, cement paste and a large number of small pores (10–600 μm), is homogenised using analytical Mori-Tanaka method with constituents’ moduli from micro-indentation. In the second, μXCT images of a 20 mm cube are converted to mesoscale representative volume elements for finite element homogenisation, with fibres and a small number of large pores (⩾600 μm) in the homogenised mortar. The resultant elastic moduli are compared favourably with experimental data. This approach accounts for a large number of pores with a wide size range yet without excessive computational cost. Effects of fibre volume fraction and orientation are investigated, demonstrating the approach’s potential to optimise the material’s micro-structure for desired properties.
    Original languageEnglish
    Pages (from-to)230-240
    Number of pages11
    JournalConstruction and Building Materials
    Volume130
    Early online date12 Nov 2016
    DOIs
    Publication statusPublished - 15 Jan 2017

    Keywords

    • Fibre reinforced concrete
    • X-ray computed tomography
    • Image-based modelling
    • Homogenisation
    • Finite elements
    • Pores

    Research Beacons, Institutes and Platforms

    • Advanced materials

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