New Instrument and Analysis Method for Accurate Freeze-Thaw Measurement.

Author(s)
Yu, X. Liu, N. Gonzalez, J. & Yu, X.
Year
Abstract

Time Domain Reflectometry (TDR) method was studied for the ability of monitoring the freeze-thawing cycle in soils. TDR is an established technology for measuring the volumetric water content. The dielectric constant and electrical conductivity (inverse of resistivity) of a soil specimen can be directly measured by analyzing a TDR signal. We found TDR measured soil dielectric constant during the freeze/thaw cycle clearly indicates the different stages of the freeze/thaw process, i.e., not only the onset of freeze or thaw process, but also the extent of their development. Based on this observation, a method is developed to directly estimate the degree of freeze/thaw from a TDR measurement. Compared with existing technologies for frost measurement, TDR has advantages in that it provides more details on the progresses of freeze/thaw status. Besides, it is rugged, inexpensive and automatic. These make TDR a promising tool to provide sound decision-support for pavement preservation in cold region.

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Publication

Library number
C 43884 (In: C 43862 CD-ROM) /62 / ITRD E838298
Source

In: Compendium of papers CD-ROM 87th Annual Meeting of the Transportation Research Board TRB, Washington, D.C., January 13-17, 2008, 10 p.

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