Theoretical Aspects on Elastic Waves and Applications to Nondestructive Evaluation of Concrete
By M. Ohtsu
Concrete Journal,Vol. 46, No.2, Feb. 2008
- Synopsis
- For nondestructive evaluation (NDE) of concrete structures, elastic-Wave methods have been extensively applied. Based on theoretical aspects of elastic waves, Lamb's problem for the impact-echo and the generalized theory of acoustic emission (AE) are discussed. In order to demonstrate the applicability of elastodynamics in concrete, experimental and analytical results on Lamb' problem and synthesized AE waves are demonstrated. Then, updated results on SIBIE (Stack Imaging of spectral amplitudes Based on Impact Echo) applied to detection of an ungrouted duct in prestressed concrete, and those on SiGMA (Simplified Green's functions for Moment tensor Analysis) for identifying the process of diagonal-shear failure in reinforced concrete by AE are presented.
- Keywords:
- Nondestructive Evaluation (NDE), Elastic Waves, Impact Echo, Lamb's Problem, Acoustic Emission (AE)
