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http://dx.doi.org/10.7843/kgs.2014.30.1.93

A Study on Cementation of Sand Using Blast Furnace Slag and Extreme Microorganism  

Park, Sung-Sik (Dept. of Civil Engrg., Kyungpook National Univ.)
Choi, Sun-Gyu (Dept. of Civil Engrg., Kyungpook National Univ.)
Nam, In-Hyun (Geologic Hazards Dept., Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of the Korean Geotechnical Society / v.30, no.1, 2014 , pp. 93-101 More about this Journal
Abstract
In this study, a blast furnace slag having latent hydraulic property with an alkaline activator for resource recycling was used to solidify sand without using cement. Existing chemical alkaline activators such as $Ca(OH)_2$ and NaOH were used for cementing soils. An alkaliphilic microorganism, which is active at higher than pH 10, is tested for a new alkaline activator. The alkaliphilic microorganism was added into sand with a blast furnace slag and a chemical alkaline activator. This is called the microorganism alkaline activator. Four different ratios of blast furnace slag (4, 8, 12, 16%) and two different chemical alkaline activators ($Ca(OH)_2$ and NaOH) were used for preparing cemented specimens with or without the alkaliphilic microorganism. The specimens were air-cured for 7 days and then tested for the experiment of unconfined compressive strength (UCS). Experimental results showed that as a blast furnace slag increased, the water content and dry density increased. The UCS of a specimen increased from 178 kPa to 2,435 kPa. The UCS of a specimen mixed with $Ca(OH)_2$ was 5-54% greater than that with NaOH. When the microorganism was added into the specimen, the UCS of a specimen with $Ca(OH)_2$ decreased by 11-60% but one with NaOH increased by 19-121%. The C-S-H hydrates were found in the cemented specimens, and their amounts increased as the amount of blast furnace slag increased through SEM analysis.
Keywords
Blast furnace slag; Extreme microorganism; Alkaline activator; Unconfined compressive strength;
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Times Cited By KSCI : 5  (Citation Analysis)
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