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Sampling Techniques for Evaluating Large Concrete Structures: Part I

This article, the second in a series of two on the use of sampling techniques to assist in the evaluation of large concrete structures, presents research on the use of sampling techniques, notably the choices needing concerning the number and location of nondestructive tests and how to state the knowledge gained from such testing. The authors stress that the challenges in this testing process lie in selecting test locations, managing collected data, and stating testing results. In this study, to assess a sampling method's applicability, sampling was applied to data from actual structures that had previously been extensively tested; predictions based on sampling were then compared to actual results from comprehensive testing. The authors conclude that sampling methods are useful for determining the number of samples needed and the best locations for sampling. The authors recommend that the results be stated as a confidence interval, presenting a range for the prediction based on an acceptable uncertainty. They report specifically on their procedure (including simple random, systematic, and adaptive sampling) as it is applied to a 7.5 mi (12 km) long reinforced concrete seawall, where the aim was to locate delaminations caused by corrosion of the reinforcing bars.