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The Scientific World Journal
Volume 2014, Article ID 526491, 11 pages
http://dx.doi.org/10.1155/2014/526491
Research Article

Effect of Strength Enhancement of Soil Treated with Environment-Friendly Calcium Carbonate Powder

Department of Civil Engineering, Chosun University, Gwangju 501-759, Republic of Korea

Received 30 August 2013; Accepted 1 December 2013; Published 4 February 2014

Academic Editors: E. Lui and İ. B. Topçu

Copyright © 2014 Kyungho Park et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study aims to investigate the effects of the strength improvement of soft ground (sand) by producing calcium carbonate powder through microbial reactions. To analyze the cementation effect of calcium carbonate produced through microbial reaction for different weight ratios, four different types of specimens (untreated, calcium carbonate, cement, and calcium carbonate + cement) with different weight ratios (2%, 4%, 6%, and 8%) were produced and cured for a period of 3 days, 7 days, 14 days, 21 days, and 28 days to test them. The uniaxial compression strength of specimens was measured, and the components in the specimen depending on the curing period were analyzed by means of XRD analysis. The result revealed that higher weight ratios and longer curing period contributed to increased strength of calcium carbonate, cement, and calcium carbonate + cement specimens. The calcium carbonate and the calcium carbonate + cement specimens in the same condition showed the tendency of decreased strength approximately 3 times and two times in comparison with the 8% cement specimens cured for 28 days, but the tendency of increased strength was approximately 4 times and 6 times in comparison with the untreated specimen.