Improvement effect of soil by calcium carbonate precipitation technique derived from waste shells

Research Project

Project/Area Number	24560613
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Geotechnical engineering
Research Institution	Ishikawa National College of Technology
Principal Investigator	SHIGEMATSU Hiroaki 石川工業高等専門学校, その他部局等, 教授 (90353268)
Research Collaborator	TANAKA Hitoshi 株式会社田中建設
Project Period (FY)	2012-04-01 – 2015-03-31
Project Status	Completed (Fiscal Year 2014)
Budget Amount *help	¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000) Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000) Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000) Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords	土質改良 / 炭酸カルシウム / 貝殻 / 改良土
Outline of Final Research Achievements	When the CaCl2 aqueous solution is penetrated into the target-treated soil which was mixed with sodium carbonate (Na2CO3) in advance, CaCO3 crystal is precipitated among soil particles. As the results, the soil particles are cemented each other and then the improved soil turns into very strong material. In this study, in order to clarify the effect of the improved soil by the calcium carbonate technique, a series of laboratory tests were carried out. The following conclusion is obtained from the present study. The strength characteristics, compressive strength and penetration resistance, of the improved soil is fluctuated remarkably with changes of amount of sodium carbonate mixed in advance.