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http://dx.doi.org/10.7843/kgs.2015.31.1.37

Field Study for Application of Soil Cementation Method Using Alkaliphilic Microorganism and Low-cost Badge  

Choi, Sun-Gyu (Dept. Civil, Construction & Environmental Engrg., Iowa State Univ.)
Chae, Kyung-Hyeon (Dept. of Civil Engrg., Kyungpook National Univ.)
Park, Sung-Sik (Dept. of Civil Engrg., Kyungpook National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.31, no.1, 2015 , pp. 37-46 More about this Journal
Abstract
In this study, a blast furnace slag with the alkaliphilic microorganism (Bacillus halodurans) alkaline activator was used to cement natural soils in the field. A low-cost and massive microbial solution for cementation of field soils was produced and compared with existing microbial culture in terms of efficiency. A field soil was prepared for three different cementation areas: a cemented ground with microbial alkaline activator (Microbially-treated soil), a cemented ground with ordinary Portland cement (Cement-treated soil), and untreated ground (Non-treated soil). The testing ground was prepared at a size of 2.6 m in width, 4 m in length, and 0.2 m in depth. After 28 days, a series of unconfined compression tests on the cement-treated and microbially-treated soils were carried out. On the other hand, a torvane test was carried out for non-treated soil. The strength of field soils treated with microorganism was 1/5 times lower than those of cement-treated soil but is 6 times higher than non-treated soil. The pH measured from microbially-treated soil was about 10, which is lower than that of cement-treated soil (pH = 11). Therefore, it is more eco-friendly than Portland cemented soils. The C-S-H hydrates were found in both cement- and microbially-treated soils through SEM-EDS analyses and cement hydrates were also found around soil particles through SEM analysis.
Keywords
Blast furnace slag; Alkaliphilic microorganism; Alkaline activator; Field test; Strength;
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Times Cited By KSCI : 5  (Citation Analysis)
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