A comprehensive instrumentation system was installed at four sites across the state of Tennessee, USA to monitor long-term seasonal changes in flexible pavement response. Data have been collected at these sites for over five years. The temperature and water content of the various pavement layers were measured by thermistors and time domain reflectometry probes. Weather information was collected by a weather station at each site. Falling weight deflectometer tests were used to observe the pavement response in different seasons. Because all four pavement systems were new construction and lacked significant distress, the observed water content changes and corresponding changes in subgrade and base moduli in the pavement system were small. As weathering takes place and the pavement systems experience additional loading cycles, it is anticipated that the seasonal moisture changes will increase. Temperature variations were significant, and it was shown that the anticipated pavement life may be affected by the temperature time interval used in analysis.
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