Mobile Surface Capacitive Electrode Sensor to Assess the Corrosion Vulnerability of Concrete Materials

Over the past few years, numerous electromagnetic sensors have emerged for gauging the dielectric properties of building materials and correlate them with their mechanical condition. However, the limitation on many existing sensors is that they require access from both sides of the material or are limited to lab settings. In this research work, the mobile surface capacitive electrode sensor (MSCES) and its theoretical foundation for use are presented to overcome such limitation. The MSCES is structurally similar to a capacitive electrode, consisting of two conducting plates spaced apart by a predetermined distance. The smooth, flat surfaces of these plates allow for easy contact with the material being tested. Initial validation of the system was conducted using samples with known dielectric properties, such as Teflon. A surface sensor prototype was subsequently created, and it was distinguished by its user-friendly design, affordability, portability, and lightweight. Concrete specimens were produced, and chloride was added to the mix at various concentrations. Another set of concrete specimens was prepared with various moisture content. The MSCES was then employed to assess the dielectric constant and microwave loss factor of fiber concrete, considering the factors affecting the corrosion potential of reinforced concrete, such as moisture and chloride content. The results of this research work show that the sensor's usefulness in evaluating the corrosion vulnerability of concrete materials.