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Surface-Wave Based Model for Estimation of Discontinuity Depth in Concrete
Eunjong Ahn1, Hyunjun Kim2, Sung-Han Sim3
1School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea. eunjong@unist.ac.kr.
Sensors (Basel, Switzerland)
|August 29, 2018
Summary
This study presents a new model to estimate crack depth in concrete using surface-wave transmission. The method accurately measures crack depth across various concrete types and crack sizes.
Area of Science:
- Civil Engineering
- Materials Science
- Non-Destructive Testing
Background:
- Surface-breaking discontinuities like cracks compromise concrete integrity.
- Accurate crack depth estimation is crucial for structural health monitoring and maintenance.
- Existing methods may lack accuracy or practicality for diverse concrete types.
Purpose of the Study:
- To develop and validate an accurate and practical model for estimating surface-breaking crack depth in concrete.
- To investigate the influence of different concrete mixture types and crack depths on surface-wave transmission.
- To utilize a surface-wave spectral energy approach for quantitative crack characterization.
Main Methods:
- Experimental analysis on lab-scale concrete specimens (mortar, normal strength concrete, high strength concrete).
- Simulated cracks of four different depths were introduced.
- Quantitative characterization of surface-wave transmission across discontinuities.
- Application of a surface-wave spectral energy approach considering a wide frequency range.
Main Results:
- Surface-wave transmission characteristics were significantly affected by crack depth and concrete mixture type.
- The proposed spectral energy approach effectively captured the relationship between wave transmission and crack depth.
- Validated model demonstrated high accuracy in crack depth estimation through RMSE analysis.
Conclusions:
- The developed model provides an accurate and practical method for estimating surface-breaking crack depth in concrete.
- The surface-wave spectral energy approach is effective across different concrete types and crack sizes.
- This technique offers a valuable tool for non-destructive evaluation of concrete structures.
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