The objective of this work was to demonstrate the utility of new vertical electrical impedance and acoustic impact-echo scanning devices recently developed at Brigham Young University for rapidly assessing the condition of concrete bridge decks and planning repairs. While impedance testing provides an evaluation of the protection against chlorides provided by any deck surface treatments, the full depth of the concrete cover, and any rebar coatings, impact-echo testing detects damage in the form of delamination in concrete bridge deck surfaces. Both devices permit data collection from a continuously moving platform with speeds up to 3600 lineal ft per hour and 7200 lineal ft per hour, respectively, as demonstrated on a concrete bridge deck in northern Utah with 11 spans, a length of 1425 ft, and a deck surface area of about 40,600 ft2. In this research, spatial variations in impedance and impact-echo data were substantially similar to spatial variations in half-cell potential and chaining data, respectively, and were also consistent with the results of coring and chloride concentration sampling, which enabled a high level of confidence in the data interpretation. Recommendations for deck repair were based on the collected data.
1. Hema, J., W. S. Guthrie, and F. S. Fonseca. (2004). Concrete Bridge Deck Condition Assessment and Improvement Strategies . Report UT-04.16. Utah Department of Transportation, Salt Lake City, UT.
2. Bartholomew, P. D., W. S. Guthrie, and B. A. Mazzeo. (2012). “Vertical Impedance Measurements on Concrete Bridge Decks for Assessing Susceptibility of Reinforcing Steel to Corrosion.” Review of Scientific Instruments, 83.
3. Guthrie, W. S., and B. A. Mazzeo. (2015). “Vertical Impedance Testing for Assessing Protection from Chloride-Based Deicing Salts Provided by an Asphalt Overlay System on a Concrete Bridge Deck.” Proceedings of the Sixteenth International Conference on Cold Regions Engineering , Salt Lake City, UT.
4. Argyle, H. M. (2014). Sensitivity of Electrochemical Impedance Spectroscopy Measurements to Concrete Bridge Deck Properties. M.S. thesis, Department of Civil and Environmental Engineering, Brigham Young University, Provo, UT.
5. Hope, B. B., and A. K. Ip. (1985). “Corrosion and Electrical Impedance in Concrete.” Cement and Concrete Research , 15(3), 525-534.
6. Oh, T., J. S. Popovics, and S.-H. Sim. (2013). “Analysis of Vib ration for Regions above Rectangular Delamination Defects in Solids,” Journal of Sound and Vibration , 332, 1766-1776.
7. Guthrie, W. S., and T. M. Pinkerton. (2008). Sensitivity of Half-Cell Potential Measurements to Properties of Concrete Bridge Decks . Report UT-08.21. Utah Department of Transportation, Salt Lake City, UT.
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