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|Title:||Frost action predictive techniques for roads and airfields : a comprehensive survey of research findings|
|Authors:||United States. Federal Aviation Administration.|
United States. Federal Highway Administration.
Johnson, T. C. (Thaddeus C.)
Berg, Richard L.
Chamberlain, Edwin J.
Cole, David M.
Frost heave models
|Publisher:||Cold Regions Research and Engineering Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||CRREL report ; 86-18.|
Abstract: Findings from a six-year field and laboratory program of frost-action research in four areas are summarized. Research on the first topic, frost-susceptibility index tests, led to selection of the Corps of Engineers frost design soil classification system as a useful method at the simplest level of testing. At a much more complex level, a new freezing test combined with a CBR test after thawing is recommended as an index of susceptibility to both frost heave and thaw weakening. Under the second topic, a soil column and dual gamma system were developed and applied to obtain soil data used in improving and validating a mathematical model of frost heave, the objective of the third topic. The model was effectively improved, a probabilistic component was added, and it was successfully tested against field and laboratory measurements of frost heave. A thaw consolidation algorithm was added, which was shown to be useful in predicting the seasonal variation in resilient modulus of granular soils, the objective of the fourth topic. A laboratory testing procedure was developed for assessing the resilient modulus of thawed soil at various stages of the recovery process, as a function of the applied stress and the soil moisture tension, which increases as the soil gradually desaturates during recovery. The procedure was validated by analyzing deflections measured on pavements by a falling-weight deflectometer. Frame-works for implementing findings from the principal research topics are outlined.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||CRREL Report|
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|CR-86-18.pdf||3.25 MB||Adobe PDF|