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dc.contributor.authorMujah, D.
dc.contributor.authorCheng, L.
dc.contributor.authorShahin, Mohamed
dc.date.accessioned2018-12-13T09:13:19Z
dc.date.available2018-12-13T09:13:19Z
dc.date.created2018-12-12T02:46:40Z
dc.date.issued2018
dc.identifier.citationMujah, D. and Cheng, L. and Shahin, M. 2018. Microstructural and geo-mechanical study on bio-cemented sand for optimization of MICP process. Journal of Materials in Civil Engineering. 31(4): Article ID 04019025.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/72421
dc.identifier.doi10.1061/(ASCE)MT.1943-5533.0002660
dc.description.abstract

Limited research has been reported on strength improvement of biocemented soils in relation to crystal patterns of microbially induced calcite (CaCO3) precipitation (MICP). In this study, sand samples were treated under the coeffect of different bacterial culture (BC) and cementation solution (CS) concentrations to evaluate the optimum BC and CS combination that yields the highest soil strength. It was found that for lower CS conditions (0.25 M), higher BC produced stronger samples, whereas for higher CS conditions (0.5 M or 1 M), lower BC was more dominant in improving the soil strength. This can be attributed to the effectively precipitated CaCO3 crystals, which were in rhombohedral shape and large size and were concentrated at the soil pore throat rather than deposited on the individual sand grain surface. This finding was confirmed with the scanning electron microscopy (SEM) analysis. The strength and permeability of the optimized biocemented samples were also compared with sand samples treated with ordinary portland cement (OPC). The optimized biocemented sand provided higher strength and permeability than those obtained from the samples treated with similar content of OPC at a curing period of 28 days.

dc.publisherAmerican Society of Civil Engineers (ASCE)
dc.titleMicrostructural and geo-mechanical study on bio-cemented sand for optimization of MICP process
dc.typeJournal Article
dcterms.source.volume31
dcterms.source.number4
dcterms.source.startPage04019025
dcterms.source.endPage04019025
dcterms.source.issn0899-1561
dcterms.source.titleJournal of Materials in Civil Engineering
curtin.note

This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://ascelibrary.org/doi/10.1061/%28ASCE%29MT.1943-5533.0002657

curtin.departmentSchool of Civil and Mechanical Engineering (CME)
curtin.accessStatusOpen access


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