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.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The biochar used in this study was produced from green waste residue under slow pyrolysis process by Pacific Pyrolysis Pty Ltd., NSW, Australia.
References
Ahnberg, H., Johansson, S.-E., Pihl, H., and Carlsson, T. (2003). “Stabilising effects of different binders in some Swedish soils.” J. Ground Improv., 7(1), 9–23.
BS 1924. (1990). “British standard of stabilized materials for civil engineering purpose.” British Standard Institution, London, U.K.
Ingles, O. G., and Metcalf, J. B. (1972). Soil stabilization: Principles and practice, Butterworths, Sydney, Australia.
Islam, S., Haque, A., and Wilson, S. A. (2014). “Effects of curing environment on the strength and mineralogy of lime-slag treated acid sulphate soils.” J. Mater. Civ. Eng., 103–108.
Islam, S., Haque, A., Wilson, S. A., and Ranjith, P. G. (2013). “Improvement of acid sulphate soils using lime activated slag.” Proc. Inst. Civ. Eng. Ground Improv., in press.
James, R., Kamruzzaman, A. H. M., Haque, A., and Wilkinson, A. (2008). “Behaviour of lime slag treated soils.” Proc. Inst. Civ. Eng. Ground Improv., 161(4), 207–216.
Jegandan, S., Liska, M., Osman, A. A.-M., and Al-Tabbaa, A. (2010). “Sustainable binders for soil stabilization.” Proc. Inst. Civ. Eng. Ground Improv., 163(GI1), 53–61.
Lehmann, J. (2007). “A handful of carbon.” Nature, 447(7141), 143–144.
Little, D. N., Nair, S., andHerbert, B. (2010). “Addressing sulphate-induced heave in lime treated soils.” J. Geotech. Geoenv. Eng., 110(1), 110–118.
Mitchell, J., and Kelly, R. (2013). “Addressing some current challenges in ground improvement.” Proc. Inst. Civ. Eng. Ground Improv., 166(3), 127–137.
Spaulding, C., Massey, F., and LaBrozzi, J. (2008). “Ground improvement technologies for a sustainable world.” Proc., Geocongress, ASCE GSP, 178, Reston, VA, 891–898.
Wilkinson, A., Haque, A., and Kodikara, J. (2010b). “Stabilization of clayey soils with industrial by-products: Part A.” Proc. Inst. Civ. Eng. Ground Improv., 163(3), 149–163.
Wilkinson, A., Haque, A., Kodikara, J., Adamson, J., and Christie, D. (2010a). ”Improvement of problematic soils by lime slurry pressure injection: Case study.” J. Geotech. Geoenviron. Eng., 1459–1468.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 12 • December 2014
Copyright
© 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
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.