Geopolymer-based moisture sensors for reinforced concrete health monitoring

•First-time demonstration of geopolymer materials moisture sensing.•Formulation of novel circuit model of geopolymer systems.•3D analytical correlation function between impedance, moisture and temperature.•Demonstrated 0.1 wt% and 0.1 °C precision for moisture and temperature.•Sensor response repeatable to within 3% between wetting and thermal cycles.