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http://dx.doi.org/10.7843/kgs.2016.32.12.59

Unfrozen Water Content and Unconfined Compressive Strength of Frozen Soils according to Degree of Saturations and Silt Fractions  

Kim, Sang Yeob (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Hong, Won-Taek (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Hong, Seung Seo (Korea Institute of Civil Engrg. and Building Technology)
Baek, Yong (Korea Institute of Civil Engrg. and Building Technology)
Lee, Jong-Sub (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.32, no.12, 2016 , pp. 59-67 More about this Journal
Abstract
The strength of frozen soils is affected by size and shape of particles, and the amount of ice and unfrozen water. The objective of this study is to characterize the unfrozen water content and the unconfined compressive strength of the frozen soils according to the degree of saturations and silt fractions. The specimens are mixtures of sand, silt, and water. The silt fractions (SF), which are the ratio of the silt weight ($W_{silt}$) to the sand weight ($W_{sand}$), are 10% and 30%. In addition, the degrees of the saturation are 5%, 10%, 15%, and 20%. The specimens are frozen under the temperature of $-10^{\circ}C$ conditions. The uniaxial compression tests are conducted for 24 hours, 48 hours, and 72 hours after freezing to determine proper freezing time. The freezing time of 24 hours is chosen because the unconfined compressive strengths of specimens after 24 hours freezing times are similar to each other. Furthermore, the unfrozen water content is monitored during freezing using the TDR system. The unfrozen water content increases with the increase of the silt fraction and degree of saturation. The unconfined compressive strength of the frozen soils exponentially increases with increasing the degree of saturation. This study shows that the amount of ice has more influence on the strength of the frozen soils than the amount of unfrozen water.
Keywords
Degree of saturation; Frozen soils; Ice; Silt fraction; TDR; Unfrozen water; Unconfined compressive strength;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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