A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Non-contact imaging for surface-opening cracks in concrete with air-coupled sensors
Abstract Rapid and accurate non-destructive evaluation (NDE) techniques are needed to assess the in-place condition of concrete structures. However the time and effort required to perform NDE tests using conventional surface-mounted contact sensors hinder rapid evaluation of large full-scale structures. The suitability of surface waves and non-contact sensing techniques to detect the presence of concrete defects is examined here. First, the ability to detect leaky surface waves in concrete with air-coupled sensors is demonstrated. Surface waves in a concrete slab specimen are generated by an electrically-controlled impact source. Next, the data and signal processing needed to improve leaky surface wave data, with respect to eventual application to velocity and attenuation images, are demonstrated. Finally velocity and wave attenuation data collected from a concrete slab specimen that exhibits surface cracking are presented. Test results show that the proposed energy ratio (attenuation) criterion is more sensitive to existence of cracks than the velocity criterion.
Non-contact imaging for surface-opening cracks in concrete with air-coupled sensors
Abstract Rapid and accurate non-destructive evaluation (NDE) techniques are needed to assess the in-place condition of concrete structures. However the time and effort required to perform NDE tests using conventional surface-mounted contact sensors hinder rapid evaluation of large full-scale structures. The suitability of surface waves and non-contact sensing techniques to detect the presence of concrete defects is examined here. First, the ability to detect leaky surface waves in concrete with air-coupled sensors is demonstrated. Surface waves in a concrete slab specimen are generated by an electrically-controlled impact source. Next, the data and signal processing needed to improve leaky surface wave data, with respect to eventual application to velocity and attenuation images, are demonstrated. Finally velocity and wave attenuation data collected from a concrete slab specimen that exhibits surface cracking are presented. Test results show that the proposed energy ratio (attenuation) criterion is more sensitive to existence of cracks than the velocity criterion.
Non-contact imaging for surface-opening cracks in concrete with air-coupled sensors
Zhu, J. (author) / Popovics, J. S. (author)
2005
Article (Journal)
English
Non-contact imaging for surface-opening cracks in concrete with air-coupled sensors
| British Library Online Contents | 2005
Non-contact imaging for surface-opening cracks in concrete with air-coupled sensors
| Online Contents | 2005
Non-contact imaging for surface-opening cracks in concrete with air-coupled sensors
| Springer Verlag | 2005
Evaluating Surface-Breaking Cracks in Concrete Using Air-Coupled Sensors
| British Library Online Contents | 2011
Evaluating Surface-Breaking Cracks in Concrete Using Air-Coupled Sensors
| Online Contents | 2011