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http://dx.doi.org/10.7843/kgs.2018.34.3.57

Evaluation of Freezing Patterns for Sand and Clay by Using X-ray CT  

Song, Jun Young (Dept. of Civil and Environmental Engrg., Yonsei Univ.)
Lee, Jangguen (Korea Institute of Civil Engrg. and Building Technology)
Lee, Seong-Won (Korea Institute of Civil Engrg. and Building Technology)
Lee, Junhwan (Dept. of Civil and Environmental Engrg., Yonsei Univ.)
Yun, Tae Sup (Dept. of Civil and Environmental Engrg., Yonsei Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.3, 2018 , pp. 57-65 More about this Journal
Abstract
This study adopts high resolution 3D X-ray CT imaging technique to visualize and evaluate the internal structure of experimentally frozen soils. Temperature and elastic wave velocity are also measured during the freezing process. The X-ray images of frozen specimens reveal that no changes in internal structure are observed for sand specimen, whereas systematic growth pattern of pore ice is observed within clay specimen. The freezing patterns are then quantified by a set of X-ray images with the aid of two-point correlation method by computing characteristic length Lr. The results reveal that characteristic length for pore ice freezing pattern in clay linearly increases with respect to the distance from the cooling source, so that Lr at the bottom layer is 2.5 times greater than the top layer when freezing process is completed. Furthermore, during the freezing process, local temperature differences are not observed in sand, but observed in clay specimen due to its relatively low thermal conductivity.
Keywords
Frozen soil; 3D X-ray CT; Two-point correlation; Elastic wave velocity;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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