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http://dx.doi.org/10.7843/kgs.2018.34.10.39

An Experimental Study on the Elastic Modulus of Deep Mixing Ground Specimen  

Park, Choon-Sik (School of Civil, Environmental and Chemical Engrg., Changwon Univ.)
Park, Hwan-Ki (Province of Gyeongsangnam-do)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.10, 2018 , pp. 39-49 More about this Journal
Abstract
In this study, aimed at determining the elastic modulus of deep mixed samples, 320 test specimens were developed by mixing 8%, 10%, 12%, and 14% of stabilizer mixture in the granular conditions of clay, sand and gravel. Uniaxial compression tests were carried out using these specimens, and the uniaxial compression strength and strain were analyzed to determine the secant elastic modulus and tangent elastic modulus. Laboratory test results showed that the uniaxial compression strength of all deep mixed samples increased with increasing curing time and stabilizer mixing ratio, and that the secant elastic modulus and the tangen elastic modulus also increased. The increase of the elastic modulus according to the curing period turned out greater in the tangent elastic modulus than in the secant elastic modulus. In order to measure elastic modulus with changes in stabilizer mixing ratio, the correlation coefficient between the elastic modulus for stabilizer mixing ratio of 8% and that of 10%, 12% and 14% was calculated respectively by the specimen condition. The elastic modulus tended to increase as the grain size in a deep mixed specimen increased. The distribution of grain size that had the greatest effect appeared when the composition ratio of sand was high. On the other hand, the increase in the elastic modulus was larger in the sand specimens than in the clay and gravel specimens. Based on these results, it is suggested that a pertinent soil parameter of the deep mixed ground in the field may be obtained by the particle size distribution and the mixing ratio of stabilizer of the deep mixed soil.
Keywords
Elastic modulus; Stabilizer contents; Deep mixing specimen; Curing time; Uniaxial compression test;
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