Detection of the Rebar Corrosion in Concrete Using a New IOT-Based Device Constructed by the Solid-Phase Electrodes and Pressure Sensors

This study developed an innovative device, “IoT Corr,” to monitor rebar corrosion’s physical and chemical characteristics in concrete. A corrosion potential sensor (solid-phase pseudo-reference electrode) and a resistance pressure sensor printed with a 3D printer utilizing Internet of Things (IoT) technology were employed for the device’s development. Also, a wireless power transfer (WPT) system was used to overcome charging and other issues associated with power supply systems. The 1.2-mm IoT Corr thickness caused it to be inserted into the concrete cover above the structure’s rebar. Two 3D-printed pressure sensors—one next to the IoT Corr sample rebar and one above the structural rebar—measured the pressure of the corrosion products. Sensors designed for this work were measured up to 1 MPa with a linear function. It was found that IoT Corr demonstrated a maximum difference of 2 mV in corrosion potential and 380 nA in corrosion current density compared to the PGSTAT101 potentiostat device.