Monitoring of the nano-structure response of natural clay under mechanical perturbation using small angle X-ray scattering and digital image correlation
Journal article, 2019

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.

DIC

Real-time

SAXS

Directional anisotropy

Clay

Nanoscale

Author

Georgios Birmpilis

Chalmers, Architecture and Civil Engineering, GeoEngineering

S. Hall

Lund University

Sebastian Lages

University of Erlangen-Nuremberg (FAU)

Lund University

Jelke Dijkstra

Chalmers, Architecture and Civil Engineering, GeoEngineering

Acta Geotechnica

1861-1125 (ISSN) 1861-1133 (eISSN)

Vol. 14 6 1965-1975

Subject Categories

Applied Mechanics

Other Physics Topics

Other Materials Engineering

DOI

10.1007/s11440-019-00832-8

More information

Latest update

2/15/2021