Quantitative Analysis of Chloride Ion Diffusion in Cementitious Materials Using NMR Spectroscopy
Publication: Journal of Infrastructure Systems
Volume 21, Issue 3
Abstract
Nuclear magnetic resonance (NMR) spectroscopy was employed to evaluate the effects of chloride ion diffusion on the chemical environment of hydrated cement paste and concrete. magic angle spinning NMR spectra were obtained at different depths from the surface (surface, 3 mm, and 6 mm) exposed to chloride ion solution after 1 month. Deconvolution of NMR spectra obtained from different depths of concrete exposed to salt solution revealed a clear trend in chloride penetration. Most importantly, the intensities and areas under peaks corresponding to Friedel’s salt (8.5 ppm) and ettringite (13.3 ppm), which reflect the extent of chemical binding of chloride by cement hydrates, dropped with increasing depth. These trends demonstrate the ability of NMR spectroscopy to track chloride ion diffusion into the concrete. Fourier-transform infrared spectroscopy spectroscopy and wet chemistry methods were employed in order to verify the findings of NMR spectroscopy.
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Acknowledgments
The writers wish to acknowledge the financial support of the U.S. DOT (Turner Fairbank Highway Research Center) Contract No. DTRT57-12-C-10064, for the research reported in this paper. The writers are also thankful to Dr. Rui H. Huang to run NMR spectroscopy on prepared samples.
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Published In
Journal of Infrastructure Systems
Volume 21 • Issue 3 • September 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 1, 2013
Accepted: Aug 27, 2014
Published online: Sep 26, 2014
Discussion open until: Feb 26, 2015
Published in print: Sep 1, 2015
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