Sustainable road bases with microbial precipitation

Article

Porter, Hannah, Dhami, Navdeep Kaur and Mukherjee, Abhijit. 2018. "Sustainable road bases with microbial precipitation." Proceedings of the Institution of Civil Engineers: Construction Materials. 171 (3), pp. 95-108. https://doi.org/10.1680/jcoma.16.00075
Article Title

Sustainable road bases with microbial precipitation

ERA Journal ID124096
Article CategoryArticle
AuthorsPorter, Hannah (Author), Dhami, Navdeep Kaur (Author) and Mukherjee, Abhijit (Author)
Journal TitleProceedings of the Institution of Civil Engineers: Construction Materials
Journal Citation171 (3), pp. 95-108
Number of Pages14
Year2018
Place of PublicationUnited Kingdom
ISSN1747-650X
1747-6518
Digital Object Identifier (DOI)https://doi.org/10.1680/jcoma.16.00075
Web Address (URL)https://www.icevirtuallibrary.com/doi/full/10.1680/jcoma.16.00075
Abstract

The Australian road network is nearly a million kilometres long, of which 83% can be classified as rural roads. The size and remote nature of Australia's road network pose unique challenges in terms of asset monitoring and maintenance costs. Cement stabilisation is a practice commonly used to improve durability and reduce inspection and repair costs. However, due to the sheer length of the road network, a huge quantity of cement is consumed in stabilisation work, making this practice unsustainable. This paper explores a sustainable alternative through augmentation of the traditional cement-based stabilisation with microbial carbonate precipitation. The calcium carbonate crystals formed within the samples were investigated by scanning electron microscopy and X-ray diffraction. Bulk mechanical properties were characterised through unconfined compressive strength (UCS) testing and the digital image correlation technique was utilised during UCS testing to extract more refined information such as local deformation and strain build-up. The mechanical properties at the microscopic scale were characterised through nanoindentation testing. The results show that microbial precipitation is able to increase the strength of cement-stabilised and road base materials significantly and can considerably improve the technological, economic and social sustainability of Australian road bases.

Keywordsgranular materials; roads & highways; 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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