Title
Interaction of ultrasonic waves with partially-closed cracks in concrete structures
Author
Pahlavan, P.L.
Zhang, F.
Blacquière, G.
Yang, Y.
Hordijk, D.
Publication year
2018
Abstract
Interaction of ultrasonic waves with partially-closed surface-breaking cracks in concrete structures has been studied. Measurements have been conducted on a reinforced concrete beam containing various mechanical-load-induced cracks and compared with the baseline measurements at those locations. Influence of crack width, incident angle of waves with cracks, and distance from the cracks on travel time and amplitude of the waves have been investigated when the beam was unloaded. It has been observed that a measurable part of the waves propagate through the cracks due to the acoustic coupling between the crack faces, although attenuation can be relatively high. The travel time has shown a nearly independent behavior from remaining crack opening in the measured range of 0.05 mm to 3 mm. Measurements in directions orthogonal and parallel to the crack suggest that there is substantial anisotropy in the cracking zone. Furthermore, an effective width of the micro-cracking area around the cracks has been estimated from the measurements.
Subject
Fluid & Solid Mechanics
SR - Structural Reliability
TS - Technical Sciences
Buildings and Infrastructures
Architecture and Building
Industrial Innovation Built Environment
Anisotropy
Ultrasonic elastic waves
Acoustic wave propagation
Concrete beams and girders
Concrete buildings
Concrete construction
Elastic waves
Acoustic coupling
Baseline measurements
Closed surfaces
Effective width
Incident angles
Mechanical loads
Reinforced concrete beams
Cracks
To reference this document use:
http://resolver.tudelft.nl/uuid:56546a19-b596-4c2c-8ed7-8587e2dd6e22
TNO identifier
787789
ISSN
0950-0618
Source
Construction and Building Materials, 167, 899-906
Document type
article