Optimisation of chloride quantification in cementitious mortars using energy-dispersive X-ray analysis
conference paper
Chlorides are responsible for initiating steel corrosion in reinforced concrete, the economically most important deterioration mechanism in concrete infrastructure. The quantification of chlorides is commonly performed by wet chemical analysis, e.g. acid dissolution and Volhard's titration. Energy-Dispersive X-Ray Spectrometry (EDS) is a powerful tool that can be employed in the detection and quantification of chlorides in cementitious materials. In order to provide fully quantitative analyses, a reference sample must be employed for calibration purposes. In this paper, commercially available microanalysis standard mount and a laboratory-made reference sample were used. Results show that the precision of the lab-made reference mount is suitable for cementitious analysis. Subsequently, chlorides were quantified in mortar specimens with concentrations of 1 and 2% wt cem. Results show that quantification of chlorides by employing different minerals was in the range of 0.8 and 1.6% for each sample, respectively.
TNO Identifier
480145
ISBN
9781627486873
Source title
35th International Conference on Cement Microscopy 2013, 28 April 2013 through 1 May 2013, Chicago, IL
Pages
35-48
Files
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