Development of an embedded wireless sensing system for the monitoring of concrete

Abstract

The application of the electromechanical impedance (EMI) method to monitor the condition of structures is an actively researched area. This article extends the method to allow it to be incorporated into a wireless sensing device, which is embedded into freshly poured concrete to monitor initial curing and subsequent structural health. The results show that the hydrating concrete has an effect on the sensing system and that it is sensitive enough to monitor the strength development of concrete. Initial results also show that the embedded EMI method is sensitive to the removal of formwork. The response of the system to compressive testing is also investigated, and the initial results show a good correlation with previously published reports on compressive testing of concrete. Finally, the ability of the system to be incorporated into a previously developed wireless-sensing platform is investigated. The AD5933 impedance chip offers this possibility, and its response is investigated and compared with the response of the HP4192A. The results show that it is feasible to design a completely wireless-sensing device for the monitoring of the strength gain of concrete and its deterioration.