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http://dx.doi.org/10.7843/kgs.2017.33.9.61

Evaluation of Soil Improvement by Carbonate Precipitation with Urease  

Song, Jun Young (Dept. of Civil and Environmental Engrg., Yonsei Univ.)
Sim, Youngjong (Land and Housing Institute)
Jin, Kyu-Nam (Land and Housing Institute)
Yun, Tae Sup (Dept. of Civil and Environmental Engrg., Yonsei Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.33, no.9, 2017 , pp. 61-69 More about this Journal
Abstract
This study presents the experimental results of $CaCO_3$ formation in sand by the Enzyme Induced Carbonate Precipitation (EICP) method. Concentration of $CaCO_3$ with elapsed reaction time is calibrated by standardized procedure by measuring $CO_2$ pressure, and it increases with time towards asymptotic value. Jumunjin sand saturated with EICP solution shows that both shear wave velocity and electrical conductivity sharply increase as the reaction starts to approach to the constant values after 50 hours of reaction time. Urease concentration of 0.5 g/L exhibits 224% higher final shear wave velocity than that of 0.1 g/L. The nucleation models hint that carbonate tends to precipitate not only at grain contacts but also at grain surfaces. Regardless of urease concentration, electrical conductivity and shear wave velocity follow the unique path. The scanning electron microscopic images and X-ray computed tomographic images validate the spatial configuration of produced $CaCO_3$ in soils.
Keywords
EICP; Urease; Cementation; Shear wave velocity; Electric conductivity; SEM; X-ray CT;
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Times Cited By KSCI : 4  (Citation Analysis)
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