Feasibility Study of Moisture Measurement of a Concrete Pavement Tile Employing a 1.7 GHz Coaxial Surface Probe

Non-destructive moisture measurement of a homogeneous concrete test sample was conducted employing a coaxial surface probe at approximately 1.7 GHz. The change in the measured resonant frequency shift of the sensor was related to the moisture content variations so that larger resonant frequency shifts were recorded at higher moisture content levels. The absolute moisture content during the experiment varied from 0.1 to 4.9 percent of mass of the sample. In conducting the data post-processing, the relative resonant frequency shift was related to the results by using linear and parabola fit, giving R-2 = 0.94 and R-2 = 0.96, respectively.