United States Department of Transportation
i
Modeling and Measurement of Rebar Corrosion and Crack Formation Using High Frequency Ultrasonics in Three Dimensions and with No Contact with the Sample
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2022-12-01
[PDF-1.65 MB]
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Edition:Final Report
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Abstract:The detection and measurement of rebar corrosion in reinforced concrete using ultrasonic Non-Destructive Testing (NDT) has been of great interest for several decades, as the operator can monitor corrosion in reinforce concrete and ideally detect early signs of corrosion, without any need to drill through or cut the concrete. The limitation of this approach resides in the ability to successfully detect early forms of corrosion before cracks reach the surface of the reinforced concrete. The goal is to demonstrate the ability to detect early appearance of cracks in reinforced concrete due to rebar corrosion, using ultrasonic nondestructive acoustic testing with no direct contact between the sensor and the concrete block, in conjunction with a poro-elastic ultrasound propagation model. The objectives are threefold: (1) Identify the proper measurement configuration and predict the performance, using the modeling of the ultrasound propagation in the reinforced concrete; (2) Perform a series of targeted measurements using the proper ultrasonic transducers on a set of existing reinforced concrete samples placed in partial or complete immersion; (3) Evaluate the degree of corrosion within the reinforced concrete with confidence levels according to the poro-elastic model, and correlate the results with those obtained (separately from this proposal) using traditional non-invasive techniques (e.g. corrosion current and corrosion potential measurements).
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