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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 language | English |
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Pages (from-to) | 230-240 |
Number of pages | 11 |
Journal | Construction and Building Materials |
Volume | 130 |
Early online date | 12 Nov 2016 |
DOIs | |
Publication status | Published - 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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- 1 Finished
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QUBE : Quasi-Brittle fracture: a 3-D experimentally-validated approach
Mummery, P. (PI), Jivkov, A. (CoI) & Yang, Z. (CoI)
1/10/12 → 30/09/15
Project: Research