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As the author Robert M Pirsig stated, “Technology presumes there’s just one right way to do things, and there never is.” Whilst measuring coating thickness on concrete substrates is not new, the introduction of a new non-destructive thickness (NDT) gauge to measure coatings on concrete not only allows the user to evaluate the results obtained by existing instrumentation, but also provides an alternate non-destructive measuring solution - thereby increasing the industry’s confidence in the overall measurement technology.
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Steel corrosion in concrete structures. Accelerated corrosion tests were performed periodically and the corrosion rates at different time intervals were measured with linear polarization resistance (LPR). The change in the resonant wavelength over time was recorded using an optical spectrum analyzer (OSA).
Electrochemical realkalization (ER) for conventionally reinforced concrete structures. Common industry practices for application of ER. Part II of 2. Part I (Item 24214) is on electrochemical chloride extraction.
Solvent-based acrylic carbon paint anodes were installed on the north approach spans of the Yaquina Bay Bridge (Newport OR) in 1985 and performed well after 15 years. Anodes were inexpensive and repairs easy. Depolarization potentials are consistently above 100 with long-term current densities around 2 mA/m 2. Bond strength remains adequate.
A case study of a major CP system operating in Australia for 15 years and proposal of a series of changes to current practices which can be considered for implementation in the design, installation and monitoring stages of new impressed current cathodic protection systems in concrete.