Comparison of linear temperature corrections and activation energy temperature corrections for electrical resistivity measurements of concrete

Alex T. Coyle, Robert P. Spragg, Prannoy Suraneni, Armen N. Amirkhanian, William J. Weiss

Research output: Contribution to journalReview articlepeer-review

7 Scopus citations

Abstract

Electrical resistivity measurements are increasingly being used as measurements for concrete acceptance in practice. It has been shown that these measurements are sensitive to temperature. This paper examines the influence of temperature on electrical resistivity measurements in concrete. Two temperature correction approaches that are commonly used by researchers and practitioners were evaluated: a linear temperature correction approach (á) and an activation energy-based temperature correction approach (Ea-cond). These approaches were compared with each other and their predictive capabilities were assessed using measured data from various concrete mixtures. It was found that for cases of low temperature sensitivity (low values of á or Ea-cond), the predictions obtained with á and with Ea-cond were similar. However, the Ea-cond approach was found to provide more accurate corrections (lower error) than corrections using á for measurements conducted at lower temperatures and for systems with higher temperature sensitivities (high values of á or Ea-cond). For saturated concrete specimens, both the linear (á) and activation energy (Ea-cond) approaches are acceptable, whereas the use of the Ea-cond approach provides better predictive capabilities in sealed concrete specimens, especially at low temperatures. The average values for Ea-cond were found to be 29.8 kJ/mol for sealed specimens and 15.8 kJ/mol for saturated specimens, and corresponding average values of á are 3.25 %/°C and 2.00 %/°C, respectively. The values for Ea-cond for saturated specimens are closer to what is expected of a pore solution on its own.

Original languageEnglish (US)
Pages (from-to)174-187
Number of pages14
JournalAdvances in Civil Engineering Materials
Volume7
Issue number1
DOIs
StatePublished - Apr 19 2018

Keywords

  • Activation energy
  • Formation factor
  • Resistivity
  • Service life
  • Temperature corrections

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering
  • Mechanics of Materials
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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