The above two figures show a graph of the drying of the concrete, determined by the EIS device, when one sensor is placed close to the concrete casting surface (50 mm from the surface) and the other to a depth of 140 mm to the concrete. The impedance responses produced by the device can be used to determine the time estimates required for the drying of concrete. The time determination can be done using either the impedance (Z) resistance Re (Z) or its reactance Im (Z). When the impedance resistance part is used, the wet concrete mass contains more ions than the water used in its manufacture, which affects the loss factor and consequently the wet concrete resistance portion is smaller than the water resistance portion indicated by dashed lines. As the concrete dries, the relationship between them begins to decrease and eventually the parts change. By projecting this intersection on the time axis (elapsed time in days), a time estimate is obtained for the drying rate of the concrete. The impedance reactance portion measured from wet concrete behaves inversely compared to its resistance portion. For the rest, the situation is as described above. Estimated time of drying of the concrete at each of the intersection points has been found to correspond well.