Can Electrical Resistance Tomography be used for imaging unsaturated moisture flow in cement-based materials with discrete cracks?

Danny Smyl, Reza Rashetnia, Aku Seppänen, Mohammad Pour-Ghaz*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

32 Citations (Scopus)

Abstract

Previously, it has been shown that Electrical Resistance Tomography (ERT) can be used for monitoring moisture flow in undamaged cement-based materials. In this work, we investigate whether ERT could be used for imaging three-dimensional (3D) unsaturated moisture flow in cement-based materials that contain discrete cracks. Novel computational methods based on the so-called absolute imaging framework are developed and used in ERT image reconstructions, aiming at a better tolerance of the reconstructed images with respect to the complexity of the conductivity distribution in cracked material. ERT is first tested using specimens with physically simulated cracks of known geometries, and corroborated with numerical simulations of unsaturated moisture flow. Next, specimens with loading-induced cracks are imaged; here, ERT reconstructions are evaluated qualitatively based on visual observations and known properties of unsaturated moisture flow. Results indicate that ERT is a viable method of visualizing 3D unsaturated moisture flow in cement-based materials with discrete cracks.

Original languageEnglish
Pages (from-to)61-72
Number of pages12
JournalCement and Concrete Research
Volume91
DOIs
Publication statusPublished - Jan 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • Crack detection
  • Finite element analysis
  • Image analysis
  • Mortar
  • Transport properties
  • IMPEDANCE TOMOGRAPHY
  • TRANSPORT-PROPERTIES
  • COVER-ZONE
  • TIKHONOV REGULARIZATION
  • HYDRAULIC CONDUCTIVITY
  • PRIOR INFORMATION
  • WATER-ABSORPTION
  • IONIC INGRESS
  • POROUS-MEDIA
  • CONCRETE

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