Subgrade Seasonal Variation Detection through Field Instrumentation in Central New York
Publication: Geo-Congress 2022
ABSTRACT
Seasonal variation introduces modulus alteration for pavement in cold region. With the onset of freezing, the pavement gains strength with the formation of ice while the opposite occurs when spring thawing takes place. As the literature asserts the layers below the zone of freezing show very little seasonal weakening, the freezing depth is of most importance for better understanding of the seasonal behavior of pavements. To better comprehend the subgrade behavior in different seasons, instrumentation was carried out in pavement subgrade in Central New York. Moisture and temperature sensors were installed up to different depths to record the real-time change of the variables with time. In addition, installed weather station provided the climatic data. Moisture variation from 0.14 m3/m3 to 0.40 m3/m3 was observed at different depths of the instrumentation from 0.31 m to 1.21 m (1 ft to 4 ft). In addition, the temperature variation exhibited a sinusoidal pattern with the peak in July and lowest in March. With the response of climate change in Northeast part, it produced a warmer 2019–2020 and 2020–2021 winter seasons. As a result, the installed sensors recorded all above zero ground temperature during the monitoring period. Preliminary seasonal models were generated using the two years monitoring data. Long-term monitoring will further reveal the true behavior of the subgrade soil with response to climatic loading.
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Geo-Congress 2022
Pages: 390 - 399
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Published online: Mar 17, 2022
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