Experimental Study on behavior of the Lightweight Air-foamed Soil Considering Freezing-thawing and Soaking Conditions

Title & Authors
Experimental Study on behavior of the Lightweight Air-foamed Soil Considering Freezing-thawing and Soaking Conditions
Kang, Daekyu; Shin, Eunchul;

Abstract
In order to determine the variability of environmental characteristics of lightweight air-foamed soil using marine clay according to freezing-thawing and soaking conditions, unconfined compressive strength of the lightweight air-foamed soil samples made by changing the amount of cement under curing conditions of outdoor low temperature, underground or indoor wetting were observed. Compressive strength was not increased under freezing-thawing (temperature range of $\small{-9.1^{\circ}C{\sim}17.2^{\circ}C}$) regardless of the amount of cement but the more cement using, it was increased rapidly by underground curing conditions within 30 cm beneath ground level. Therefore, it is necessary to install insulation layer cutting off exterior cold air after construction of lightweight air-foamed soil in condition of freezing-thawing. Bulk density was increased too small under the long-time soaking condition, it tended to decrease rapidly when samples were dried up and had below 6% of water contents. But variability of compressive strength and bulk density was very small for preventing drying and keeping its wet state. The lightweight air-foamed soil that installed beneath ground water level or covered by soil can be evaluated as a long-term reliable construction material.
Keywords
Dredged soil;Lightweight;Curing temperature;Soaking;Freezing-thawing;Drying;
Language
Korean
Cited by
References
1.

2.
Hwang, J. H., Hwang, W. K., Lee, Y. J., Park, L. K. and Kim, T. H. (2009), Characteristics related to water of lightweight air-mixed soils, Korean Geo-Environmental Conference 2009, pp. 126-131 (in Korean).

3.
Kikuchi, Y., Nagatome, T. and Noguchi, T. (2011), Analysis of strain rate-dependent consolidation behaviors of natural soil, Proceedings of the 14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, Vol. 1, THEME 5, pp. 805-810.

4.
Kikuchi, Y. and Yoshino, H. (1998), Permeability of lightweight soil made of dredged slurry mixed with air foam, International Symposium on Coastal Geotechnical Engineering in Practice, Yokohama, Balkema, Lisse, Vol. 1, pp. 635-640.

5.
Kim, Z. C. and Lee, C. K. (2002), Mechanical characteristics of light-weighted foam soil consisting of dredged soils, Journal of the Korean Geotechnical Society, Vol. 18, No. 4, pp. 309-317 (in Korean).

6.
Lee, M. A., Kim, S. W., Choi, D. K., Park, L. K. and Kim, T. H. (2012), Effect of curing temperature on the strength characteristics of lightweight air-trapped soil, Journal of the Korean Geotechnical Society, Vol. 28, No. 4, pp. 43-53 (in Korean).

7.
Tsuchida, T. and Egashira, K. (2004), The lightweight treated soil method: new geomaterials for soft ground engineering in coastal areas, A.A. Balkema Publishers, pp. 30.

8.
Tsuchida, T., Nagai, K., Okumura, T., Kishda, K. and Funada, K. (1995), Mechanical properties of lightweight geo-matrial used for the backfill of quaywalls (Part 1), Proceedings of 31st Conference on Geotechnical Engineering, pp. 2525-2528.

9.
Watabe, Y., Tanaka, M. and Sassa, S. (2011), 10-year follow-up study of air-foam treated lightweight soil placed in coastal areas, Proceedings of The Institution of Civil Engineers Ground Improvement, Vol. 164, Issue 3, pp. 189-200.

10.
Yoon, G. L. and Kim, B. T. (2004), Compressibility and characteristics of light-weighted foam soil, Journal of the Korean Geotechnical Society, Vol. 20, No. 4, pp. 5-13 (in Korean).

11.
Yoon, G. L. and You, S. K. (2005), Behaviors of lightweight foamed soils considering underwater curing and water pressure conditions, Journal of the Korean Geotechnical Society, Vol. 21, No. 4, pp. 21-29 (in Korean).