Shear strength and liquefaction resistance of sand mixed with biochar

Show simple item record Pardo Tobar, G en Orense, Rolando en Sarmah, Ajit en
dc.coverage.spatial Vancouver, BC, Canada en 2018-10-11T01:34:21Z en 2017-07 en
dc.identifier.uri en
dc.description.abstract Biochar is a carbonaceous material produced by heating any organic biomass in oxygen-free environment through pyrolysis process. Given its aromatic nature, biochar is highly recalcitrant, so as soil additive, it has been considered to have great potential to sequester carbon and reduce greenhouse gas emission. Since this material has been produced to be buried in the ground, it is important to assess its effect on soil properties from geotechnical point of view. However, to date, little work has been done in this field. A few studies have shown that biochar could increase the shear strength of clays and desaturate soil particles; therefore, it may be used to increase the liquefaction resistance of loose sand. In this study, the effect of adding biochar to sand (3% and 5% by weight) was investigated. Specimens were tested using simple shear test apparatus. Results of drained monotonic tests indicated that biochar provided higher shear resistance at lower confinement pressure (൑ 100 kPa). These specimens also developed less volumetric deformation. Undrained cyclic test results showed that the addition of biochar increased the liquefaction resistance of sand by delaying the generation of excess pore water pressure and restraining the development of shear strain. To provide an insight on the mechanism of improvement, Fourier Transform Infra-Red (FTIR) spectrum of biochar surface was measured, and the effect of time on the interaction between water and biochar was evaluated through rheological measurements. It is believed that the mechanism of improvement is related to the active functional groups on the surface and inside the pores of the biochar particles. These volatiles interact with water by repelling it (hydrophobic) and at times by attracting it, creating a complex network between water and biochar particles that helps delay the increase in excess pore water pressure and provides some shear resistance. en
dc.relation.ispartof 3rd International Conference on Performance-based Design in Earthquake Geotechnical Engineering (PBD-III) en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.title Shear strength and liquefaction resistance of sand mixed with biochar en
dc.type Conference Item en
dc.rights.holder Copyright: The author en
pubs.finish-date 2017-07-19 en
pubs.start-date 2017-07-16 en
dc.rights.accessrights en
pubs.subtype Conference Paper en
pubs.elements-id 710902 en Engineering en Civil and Environmental Eng en
pubs.record-created-at-source-date 2017-11-10 en

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