Abstract
Electrical time domain reflectometry (ETDR) stress/strain sensing technique has been successfully used in geotechnical applications to detect rock deformation and longwall movement. The ETDR sensing method appears to be practical for health monitoring applications of civil concrete structures since durable sensor media can be used. In this paper, feasibility of using an embedded coaxial ETDR cable to detect crack damages in a structure is investigated. Tension and bending tests were performed on edge-notched photoelastic epoxy specimens with embedded coaxial ETDR sensing cables. The test results show that crack lines passing through the embedded sensing cable can be detected. The TDR signal response of the sensing cable reveals not only the location of the crack damage site but also indicates the relative magnitude of the crack opening. The results of the current study strongly suggest that the ETDR sensing technique possesses a great potential for the application of health monitoring of large civil concrete structures.
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