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<p>In this study, a contact-scale approach is developed in order to measure the strength of the bio-cemented bond under shear loading. Fifteen pairs of bio-cemented sand grains, coming from two different bulk samples with different calcite content, were first observed using high-resolution synchrotron X-ray tomography in order to compute the contact surface area, before being subjected to the shear loading. After failure, these samples were also observed using scanning electron microscopy and energy-dispersive X-ray spectroscopy in order to determine the failure mode. The results have shown that the shear strength is 2.11 times higher that the tensile strength for this material, and has an average value of 5.81 ± 1.99 MPa. Digital image correlation was used in this study in order to distinguish the samples that broke due to shear from those that broke due to rolling. Similarly to the case under tensile loading, failure was also observed to occur at the interface between the sand and the calcite crystals. The percentage of active calcite crystals <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\hbox {f}_\textrm{c}\)</EquationSource> </InlineEquation> was also found to be around 25%, independently of the amount of calcite present in the initial bulk sample.</p> Graphical Abstract <p></p>

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Shear strength measurement of a calcite bond between bio-cemented sand grains

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Marilyn Sarkis,
  • Antoine Naillon,
  • Fabrice Emeriault,
  • Christian Geindreau

摘要

In this study, a contact-scale approach is developed in order to measure the strength of the bio-cemented bond under shear loading. Fifteen pairs of bio-cemented sand grains, coming from two different bulk samples with different calcite content, were first observed using high-resolution synchrotron X-ray tomography in order to compute the contact surface area, before being subjected to the shear loading. After failure, these samples were also observed using scanning electron microscopy and energy-dispersive X-ray spectroscopy in order to determine the failure mode. The results have shown that the shear strength is 2.11 times higher that the tensile strength for this material, and has an average value of 5.81 ± 1.99 MPa. Digital image correlation was used in this study in order to distinguish the samples that broke due to shear from those that broke due to rolling. Similarly to the case under tensile loading, failure was also observed to occur at the interface between the sand and the calcite crystals. The percentage of active calcite crystals \(\hbox {f}_\textrm{c}\) was also found to be around 25%, independently of the amount of calcite present in the initial bulk sample.

Graphical Abstract