The Application of X-ray Computed Tomography for Characterization of Surface Crack Networks in Bentonite-Sand Mixtures

Thomas Gebrenegus, Markus Tuller, Balasingam Muhunthan

Research output: Chapter in Book/Report/Conference proceedingChapter

5 Scopus citations

Abstract

Development and evolution of desiccation cracks in bentonite-sand mixtures are strongly dependent on the physico-chemical boundary conditions. To investigate effects of solution chemistry and mixture bentonite content on cracking behavior, we conducted well-controlled dehydration experiments and applied X-ray Computed Tomography (CT) in conjunction with Mathematical Morphology to visualize and quantify geometrical features of evolving crack networks. Sampleswith varying bentonite content were saturated with 0.05 and 0.5 molar NaCl solutions, dehydrated under constant temperature, and scanned with X-ray CT at constant time intervals. Obtained 3-D images were analyzed based on Mathematical Morphology to quantify crack porosity, specific surface area, and aperture distributions of crack networks.

Original languageEnglish (US)
Title of host publicationAdvances in X-ray Tomography for Geomaterials
PublisherWiley-ISTE
Pages207-212
Number of pages6
ISBN (Print)1905209606, 9781905209606
DOIs
StatePublished - Jan 22 2010

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Keywords

  • Bentonite
  • Clay liners
  • Desiccation cracks
  • Mathematical morphology
  • X-ray computed tomography

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Gebrenegus, T., Tuller, M., & Muhunthan, B. (2010). The Application of X-ray Computed Tomography for Characterization of Surface Crack Networks in Bentonite-Sand Mixtures. In Advances in X-ray Tomography for Geomaterials (pp. 207-212). Wiley-ISTE. https://doi.org/10.1002/9780470612187.ch18