Volume 8, Issue 10 (November 2011)
Application of Frequency Selective Circuits for Crack Detection in Concrete Elements
Recent research has demonstrated that cracking can be monitored in concrete using conductive surface elements. One complication with using conductive surface elements is that each element requires a separate data acquisition channel. To overcome this hurdle, a frequency selective circuit (FSC) has been developed to rapidly and simultaneously interrogate the response of multiple conductive surface elements. The response of the FSC is analyzed using numerical methods and the use of the FSC is demonstrated using a pilot study in which conductive surface coatings were used to simultaneously monitor the time of cracking of multiple restrained concrete rings. Results indicate that the FSC can be used to monitor a large number of surface coating elements. This technology could be extended to other resistance based sensors. The FSC approach has the potential to be used for health monitoring of infrastructure elements where a large number of sensors are used.