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A Study on Soil Cementation and Calcite Precipitation with Clay as a Medium
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 Title & Authors
A Study on Soil Cementation and Calcite Precipitation with Clay as a Medium
Park, Sung-Sik; Suh, Eun-Hee; Chae, Kyung-Hyeon; Jang, Sang Kyu; Kim, Jin-Ho;
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 Abstract
In this study, we tried to precipitate calcium carbonate with carbonate ions decomposed from urea by plant extract and calcium ions dissolved in water. The clay particles carry a net negative charge on their surfaces. Such clay mineral was additionally mixed as a medium to improve soil strength and durability with environmentally-friendly way. The solution (plant extracts and urea) and the solution (calcium chloride and clay) were mixed together with clean Nakdong River sand. Then, this mixed soil was compacted into a small cylindrical specimen and then air cured for 7 days in laboratory. The molar concentration of urea and calcium chloride was tested for three different conditions, 1, 5, and 7 mol. Three different clay contents (0, 1, and 3% per total weight) were mixed with sand. For each specimen, a series of unconfined compression test, a durability test, SEM, EDX and XRD analyses were carried out to evaluate its cementation and structure. As the molar concentration of the solution and clay content increased, the unconfined compressive strength and durability increased. The results of SEM, EDX and XRD analyses showed that calcite was precipitated around clay mineral. The thermogravimetry analysis indicated that calcium carbonate precipitated about 1~2% per total weight of the sample.
 Keywords
Cementation;Plant extracts;Urea;Calcium Carbonate;Unconfined compressive strength;
 Language
Korean
 Cited by
 References
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