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Quality and monitoring of structural rehabilitation measures , part 2 : review and assessment of non-destructive testing (NDT) techniques.
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    Part 2 : review and assessment of non-destructive testing (NDT) techniques.
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    As CFRP composites continue to gain acceptance in structural rehabilitation of deteriorating infrastructure, the consequent need for comprehensive and rapid in-situ quality assessment has arisen. Conditioned by the inevitable presence of material-, installation-, and service-induced defects, many rehabilitation schemes are likely to undergo deterioration to a level where they become ineffective, presupposing defects go undetected and are not restricted from further propagation at an early stage. At present, field methodologies encompass the rather simplistic inspection through visual inspection or surface tapping. Though applicable, these methods are largely inadequate in assessing the overall ‘health’ of rehabilitation schemes. Hence, alternative means for early detection and characterization of such defects must be developed. From the preceding discussion it was shown that non-destructive testing methodologies, as currently applied to CFRP-rehabilitated components, are often insufficient in providing field inspectors and engineers with comprehensive information on bond-, material-, and geometrical deficiencies located within the concrete/composite hybrid. These include visual inspection and acoustic impact testing, latter commonly practiced in form of a ‘coin tap’ test. Given this insufficiency, authors have evaluated a multitude of alternative non-destructive inspection methods upon their potential for in-situ quality assessment of CFRP-rehabilitated structures. Apart from methodologies currently applied in the civil sector, a variety of so-called ‘traditional’ NDE techniques, as well as methods lately progressed to become accepted ‘state-of-the-art’ techniques, were discussed. More specifically, this investigation was aimed at identifying a limited number of primary NDE methods that appear most suitable for in-situ testing of CFRPrehabilitated infrastructure. It was shown that suitability of field techniques often demands rapid and comprehensive detection of defects, without imposing negligible importance on factors like mobility, flexibility or ease of interpretation. Finally, primary NDE methods should be complementary to each other, i.e. inspection should be initiated on a full-field level with subsequent detailed inspection utilizing the more sensitive near-field technique.
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