Debonding Size Estimation in Reinforced Concrete Beams Using Guided Wave-Based Method

Area of Science:

• Structural Engineering
• Materials Science
• Non-Destructive Testing

Background:

• Debonding between steel reinforcement and concrete cover is a critical failure mode in reinforced concrete structures.
• Accurate assessment of debonding size is essential for evaluating structural integrity and load-bearing capacity.
• Existing non-destructive methods often require baseline data from undamaged structures, limiting their practical application.

Purpose of the Study:

• To develop and validate a novel, baseline-free method for quantifying the total area of debonding in reinforced concrete beams.
• To investigate the influence of debonding size, shape, and location on guided wave propagation characteristics.
• To establish a reliable technique for the non-destructive assessment of reinforced concrete structures.

Main Methods:

• Theoretical and experimental analysis of guided wave propagation in concrete beams with controlled debonding.
• Development of algorithms correlating average wave velocity and time-of-flight with debonding area.
• Experimental verification using concrete beams with varying debonding parameters.

Main Results:

• Guided waves can be effectively utilized for both detecting and quantifying the total area of debonding.
• The proposed baseline-free method accurately determines debonding area based on wave velocity and time-of-flight measurements.
• Experimental results confirm the validity of the developed relationships across different debonding scenarios.

Conclusions:

• The developed guided wave-based method offers a significant advancement in the non-destructive assessment of reinforced concrete structures.
• The baseline-free approach eliminates the need for pre-existing data from undamaged states, enhancing practical usability.
• This technique provides a precise and efficient means to determine debonding area, crucial for structural health monitoring and capacity evaluation.