Moisture Profile

The measurement of moisture profiles while drying construction concretes has been reported using strain gauges on laminated specimens [53] and by using magnetic reso­nance imaging (MRI) [54]. This last procedure has been shown to determine moisture profiles nondestructively and with very high resolution, on the order of millimeter or less. Size of specimens is limited to small cylinders (~ 2.5 cm diameter) and in situ heating of specimens limits the technique to research applications. Electromagnetic modeling of the interaction of microwave signals with moist cement-based materials [55, 56] provides the necessary insight to evaluate water content distribution and movement in refractory casta­bles in a nonintrusive manner and with potential high resolution (1 mm).