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: The infrastructure of flexible pavement is composed of aggregate subbase, anti-frost layer, and subgrade. In particular, the subgrade performance is affected by climates such as frost action and precipitation. The method of TDR(Time Domain Reflectometry) sensors to measure moisture contents in subgrade layer has been used in the research. Due to the TDR method using dielectric permitivity of soil and water, the sensors can be affected by the low subgrade temperatures. The air temperatures frequently drops below -20 ℃ in the winter in Korea. As a result, it is necessary to estimate the accuracy of the TDR moisture sensors in the range of below zero temperatures. In this study, the subgrade temperatures of lower than -2℃ were extended to evaluate temperature sensitivity of the TDR moisture sensors. The test results revealed that the moisture contents around the sensors were reduced while those of the upper part of specimen showed a tendency to increase as the specimen surface temperature drops below zero under the volumetric moisture contents(VMC) of 20% and 30%. However, the impact of temperature on the function of the sensor at lower water contents was found to be negligible if any.Key words : Road Pavement, Moisture Content, Temperature, Subgrade, TDR Sensor  :     ,     ,                         .       (Time Domain Reflectometry, TDR)        . TDR              .           20℃                 .        2℃   TDR        .  20% 30%           ,      .           . :  , , , , Highway Engineering

Temperature Sensitivity Analysis of TDR Moisture Content Sensor for Road Pavement