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dc.contributor.authorCheng, L.
dc.contributor.authorShahin, Mohamed
dc.contributor.authorChu, J.
dc.date.accessioned2018-12-13T09:11:47Z
dc.date.available2018-12-13T09:11:47Z
dc.date.created2018-12-12T02:46:40Z
dc.date.issued2018
dc.identifier.citationCheng, L. and Shahin, M. and Chu, J. 2018. Soil bio-cementation using a new one-phase low-pH injection method. Acta Geotechnica. 14 (3): pp. 615-626.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/71934
dc.identifier.doi10.1007/s11440-018-0738-2
dc.description.abstract

Soil bio-cementation via microbially induced carbonate precipitation (MICP) has been extensively studied as a promising alternative technique to traditional chemical cementing agents for ground improvement. The multiple-phase injection methods are currently well adopted for MICP treatment, but it is rather complex and requires excessive number of injections. This paper presents a novel one-phase injection method using low-pH all-in-one biocement solution (i.e. a mixture of bacterial culture, urea, and CaCl2). The key feature of this method is that the lag period of the bio-cementation process can be controlled by adjusting the biomass concentration, urease activity, and pH. This process prevents the clogging of bio-flocs formation and thus allows the biocement solution to be well distributed inside the soil matrix before bio-cementation takes effect, allowing a relatively uniform MICP treatment to be achieved. Furthermore, the ammonia gas release would be reduced by more than 90%, which represents a significant improvement in the environmental friendliness of the technology. The new one-phase method is also effective in terms of the mechanical property of MICP-treated soil; an unconfined compressive strength of 2.5 MPa was achieved for sand after six treatments.

dc.titleSoil bio-cementation using a new one-phase low-pH injection method
dc.typeJournal Article
dcterms.source.volume-
dcterms.source.number-
dcterms.source.startPage-
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dcterms.source.issn1861-1125
dcterms.source.titleActa Geotechnica
curtin.note

The final publication is available at Springer via http://dx.doi.org/10.1007/s11440-018-0738-2

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


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