Journal
ACTA GEOTECHNICA
Volume 18, Issue 1, Pages 35-55Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11440-022-01486-9
Keywords
Cemented Granular Materials; Damage; Image Analysis; Micro to Macro; Tomography
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This paper presents an experimental analysis of cement damage and fragment rearrangement in cemented granular materials, using in-situ X-ray tomography and novel image processing approaches. The study reveals the spatial correlation between cement damage and strain rate, as well as their effect on the isotropy of the bonds.
Cemented granular materials are abundant in nature and are often artificially produced. Their macroscopic behaviour is driven by small-scale material processes, which are generally classified as: grain breakage, cement damage and fragment rearrangement. This paper presents an experimental analysis of the latter two processes as observed through in-situ X-ray tomography and quantified by a suite of novel image processing approaches. This allows for example all particles and the bonds between them to be identified and their evolution to be individually quantified on a statistically representative volume, in 3D, throughout a loading test. We reveal the high spatial correlation between cement damage and strain rate and their effect on the isotropy of the bonds. Being the second of a two-part contribution, the overarching aim of this paper is to propose a general framework for the micro-inspired study of cemented granular materials. This is developed here, in Part I, in terms of multi-scale experimental quantification at sample and grain-level, while in Part II in terms of a two-way interaction with micro-inspired constitutive modelling.
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