Abstract
In this study, we present a method to estimate the depth of near-surface shallow delamination in concrete using a noncontact micro-electromechanical system (MEMS) ultrasonic sensor array and an optimization-based data processing approach. The proposed approach updates the bulk wave velocities of the tested concrete element by solving an optimization problem using reference ultrasonic scanning data collected from a full-depth concrete region. Subsequently, the depth of concrete delamination is estimated by solving a separate optimization problem. Numerical simulations and laboratory experiments were conducted to evaluate the performance of the proposed ultrasonic data processing approach. The results demonstrated that the depth of shallow delamination in concrete structures could be accurately estimated.
Highlights
Estimation Using a NoncontactThe deterioration of concrete affects the structural integrity of concrete structures and reduces their serviceability
We present a method to estimate the depth of near-surface shallow delamination in concrete using a noncontact micro-electromechanical system (MEMS) ultrasonic sensor array and an optimization-based data processing approach
The ultrasonic scanning measurement data generated from the numerical simulations and experiments are presented
Summary
The deterioration of concrete affects the structural integrity of concrete structures and reduces their serviceability. One of the most common types of damage in concrete structures is delamination at the interface between the concrete cover and the embedded steel rebars. The oxide layer around corroded steel rebars produces expansive stresses that initiate cracks with their planes parallel to the rebars (i.e., delamination). The delaminationlike damage usually occurs at bridge deck overlays which include the interface between the topping material layer and structural member. The extent of delamination damage increases over time unless it is appropriately repaired. Delamination damage needs to be detected and characterized at an early development stage to reduce the maintenance cost and improve the serviceability of concrete structures
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