Synergistic chemical and microbial cementation for stabilization of aggregates

Article

Porter, Hannah, Dhami, Navdeep Kaur and Mukherjee, Abhijit. 2017. "Synergistic chemical and microbial cementation for stabilization of aggregates." Cement and Concrete Composites. 83, pp. 160-170. https://doi.org/10.1016/j.cemconcomp.2017.07.015
Article Title

Synergistic chemical and microbial cementation for stabilization of aggregates

ERA Journal ID21082
Article CategoryArticle
AuthorsPorter, Hannah (Author), Dhami, Navdeep Kaur (Author) and Mukherjee, Abhijit (Author)
Journal TitleCement and Concrete Composites
Journal Citation83, pp. 160-170
Number of Pages11
Year2017
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0958-9465
1873-393X
Digital Object Identifier (DOI)https://doi.org/10.1016/j.cemconcomp.2017.07.015
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0958946517301154
Abstract

The use of Portland cement as a stabilizer of granular materials such as sand, is comparable to that in concrete. Although a relatively small percentage of cement is used for a stabilized soil system, the consumption of cement in Australian road bases and mining backfills is only second to the concrete industry. Conventionally, Portland cement is used as a binder for these applications. This paper explores low embodied energy alternative binders such as geopolymers and microbial cementation. A combination of the chemical and microbial binders has been attempted. The performance of the stabilized systems in terms of compressive strength, elastic modulus and water absorption was determined. It is noted that the chemical and the microbial cementation work synergistically. A microstructural investigation has been performed to reveal the synergistic nature of the two binding systems. The new technology is able to significantly reduce the embodied energy and emission of stabilized granular materials.

KeywordsBacteria; Cement stabilization; Geopolymer; Maintenance; Microbial calcite; Road bases; Sustainability
ANZSRC Field of Research 2020400502. Civil geotechnical engineering
401699. Materials engineering not elsewhere classified
400505. Construction materials
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Byline AffiliationsCurtin University
Institution of OriginUniversity of Southern Queensland
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