Biochar Sequestration in Lime-Slag Treated Synthetic Soils: A Green Approach to Ground Improvement
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 12
Abstract
Unconfined compressive strength (UCS) of synthetic biochar mixed clays (BMC) treated with lime-GGBS has been investigated. Biochar utilized in this study was produced from the slow pyrolysis of green waste residue. Treated biochar mixed clays have also been tested for microstructural and mineralogical developments. Results of this study showed that a lime content of 2 wt%, which is much lower than the conventionally used 10 wt% lime for synthetic clay, can be effectively incorporated to improve BMCs. X-ray Diffraction analysis carried out on treated BMCs showed the development of cementitious minerals (, ettringite). Scanning Electron Microscopy with Energy Dispersive Spectrum (EDS) enabled identification of three separate types of microstructural interactions between biochar and soil particles, namely interface cementation, surface deposition and pore space filling by cementitious minerals, all of which are responsible for the enhancement of UCS with curing.
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Acknowledgments
The biochar used in this study was produced from green waste residue under slow pyrolysis process by Pacific Pyrolysis Pty Ltd., NSW, Australia.
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© 2014 American Society of Civil Engineers.
History
Received: Oct 15, 2013
Accepted: Apr 22, 2014
Published online: Jun 24, 2014
Discussion open until: Nov 24, 2014
Published in print: Dec 1, 2014
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