Calibration of Five-Segment Time Domain Reflectometry Probes for Water Content Measurement in High Density Materials

摘要

Time domain reflectometry(TDR)systems are be- ing used widely for in situ measurement of soil water content. Wa- ter content is calculated based on the measured dielectric proper- ties of the soil system. TDR systems for water content measurement were originally developed for use in soils with low bulk densities similar to those found in agriculture. Four highway test sites in Tennessee were instrumented with five-segment TDR probes in the soil subgrade and in he unbound aggregate sub-base (Rainwater et al. 1999). These materials are more dense than agri- cultural soils.