Monitoring of the nano-structure response of natural clay under mechanical perturbation using small angle X-ray scattering and digital image correlation

Georgios Birmpilis, Stephen A. Hall, Sebastian Lages, Jelke Dijkstra

Research output: Contribution to journalArticlepeer-review

5 Citations (SciVal)

Abstract

This paper introduces a new experimental method to monitor the evolving intra-particle, nanometre-scale response during hydro-mechanical tests on undisturbed wet clay samples using small angle X-ray scattering (SAXS). The method uses a newly developed miniature plane-strain one-dimensional compression cell that facilitates simultaneous full-field surface displacement measurements using digital image correlation and SAXS measurements. The 60–120 s acquisition times offered by SAXS at synchrotron facilities are beneficial to study time-dependent mechanisms in clays. The experimental results presented indicate that, for the natural sensitive clay tested in this work, no significant structural changes occur at the intra-particle scale during loading, even when large strains are measured at the macro-scale. In addition, changes that are observed at this scale occur after the end of perturbation, i.e. the creation of new intra-particle structures. Further information is obtained on the orientation evolution of the fabric by the comparative analysis of the individual mineral component response.

Original languageEnglish
Pages (from-to)1965–1975
Number of pages11
JournalActa Geotechnica
Volume14
Issue number6
Early online date2019 Jun 19
DOIs
Publication statusPublished - 2019 Dec

Subject classification (UKÄ)

  • Other Materials Engineering
  • Applied Mechanics

Keywords

  • Clay
  • DIC
  • Directional anisotropy
  • Nanoscale
  • Real-time
  • SAXS

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