United States Department of Transportation
i
Development of Reference Specimens for Laboratory Testing
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2024-05-01
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[PDF-3.48 MB]
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Edition:Final Report
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Abstract:Engineers and bridge owners have widely used nondestructive evaluation (NDE) methods for the assessment and inspection of reinforced concrete structures. The creation of reference specimens featuring structural defects commonly encountered in the field is crucial for enhancing understanding of NDE technologies and certifying NDE service providers. This report presents the findings of a study aimed at establishing novel procedures for producing reference specimens for reinforced concrete structures that replicate common defects, such as surface cracks, delamination, internal honeycombing, and reinforcement corrosion-induced flaws. These procedures closely mimic the structural deficiencies observed in real-world structures. The report documents the efforts of two distinct research laboratories for both method development and validation, referred to as Research Laboratory A and B throughout this report. Research Laboratory A developed procedures to fabricate reference specimens representing common issues in concrete structures. Research Laboratory B implemented these procedures to create the reference specimens and validated the fabrication techniques established by Research Laboratory A. The results of this study lay a foundation for research laboratories to adopt standardized procedures for fabricating reference specimens. These specimens serve as essential tools for evaluating the efficacy of NDE technologies.
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