TY - GEN
T1 - Characterization of distributed cracks in concrete using randomly scattered wavefield extraction
AU - Song, Homin
AU - Popovics, John S.
N1 - Funding Information:
The work reported in this paper is performed with the support from the Integrated Research Program by the DOE-Nuclear Energy Universities Program under Award number DE-NE0008266. Any opinions, findings, conclusions in this paper are those of the authors and do not necessarily reflect the views of the funding agency.
PY - 2017
Y1 - 2017
N2 - This paper presents a fully contactless air-coupled ultrasonic scanning approach to characterize distributed cracks in concrete. The approach enables characterization of near-surface distributed cracks in concrete, for example that caused by alkali-silica reaction or freezing and thawing action. A series of numerical simulations are performed to understand surface wave scattering phenomenon caused by distributed cracks in concrete. The numerical simulation results reveal that incident surface waves undergo complicated random scattering within the cracked region. As a result of the random scattering, local wavefields having a broad wavenumber spectrum manifest. A frequency-wavenumber (f-κ) domain signal filtering approach is applied to extract the randomly scattered wavefields set up by distributed cracks. The feasibility of the proposed approach is established using a series of experiments on laboratory-scale concrete specimens including simulated distributed cracks. The experimental wavefield data obtained by fully contactless ultrasonic scanning measurements is analyzed using the f-κ domain signal filtering approach. The experimental results demonstrate that distributed cracks in concrete can be successfully characterized and further that the the extracted scattered wavefield energy is closely related to the crack density.
AB - This paper presents a fully contactless air-coupled ultrasonic scanning approach to characterize distributed cracks in concrete. The approach enables characterization of near-surface distributed cracks in concrete, for example that caused by alkali-silica reaction or freezing and thawing action. A series of numerical simulations are performed to understand surface wave scattering phenomenon caused by distributed cracks in concrete. The numerical simulation results reveal that incident surface waves undergo complicated random scattering within the cracked region. As a result of the random scattering, local wavefields having a broad wavenumber spectrum manifest. A frequency-wavenumber (f-κ) domain signal filtering approach is applied to extract the randomly scattered wavefields set up by distributed cracks. The feasibility of the proposed approach is established using a series of experiments on laboratory-scale concrete specimens including simulated distributed cracks. The experimental wavefield data obtained by fully contactless ultrasonic scanning measurements is analyzed using the f-κ domain signal filtering approach. The experimental results demonstrate that distributed cracks in concrete can be successfully characterized and further that the the extracted scattered wavefield energy is closely related to the crack density.
UR - http://www.scopus.com/inward/record.url?scp=85032373747&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85032373747&partnerID=8YFLogxK
U2 - 10.12783/shm2017/14108
DO - 10.12783/shm2017/14108
M3 - Conference contribution
AN - SCOPUS:85032373747
T3 - Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance - Proceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017
SP - 2178
EP - 2185
BT - Structural Health Monitoring 2017
A2 - Chang, Fu-Kuo
A2 - Kopsaftopoulos, Fotis
PB - DEStech Publications
T2 - 11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017
Y2 - 12 September 2017 through 14 September 2017
ER -