Journal
CEMENT AND CONCRETE RESEARCH
Volume 92, Issue -, Pages 128-141Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2016.11.014
Keywords
mu XRF; Service life; Durability; Chloride; Corrosion
Funding
- Oklahoma Department of Transportation (ODOT)
- Federal Highway Association (FHWA)
- Exploratory Advanced Research (EAR) Program
- United State National Science Foundation [CMMI 1150404 CAREER]
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Corrosion of steel reinforcement in concrete is not easy to detect until cracking has initiated. When there is a question about Cl intrusion into concrete, cores are taken, the sample is ground in controlled thicknesses, and then the powder is analyzed by titration. This paper uses micro X-ray fluorescence (mu XRF), a non-destructive chemical imaging technique, to obtain equivalent or better information than profile grinding methods with less human involvement. Fifteen different comparisons are made between profile grinding and mu XRF from the same concrete and the results are comparable. Examples are also presented where the spatial measurements made by mu XRF provide insights that are not possible with the conventional profile grinding method. This means the Cl profile can be obtained with pXRF with less human effort while providing additional insights not possible with the typical profile grinding analysis. (C) 2016 Elsevier Ltd. All rights reserved.
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