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Use of carrier materials to immobilise and supply cementation medium for microbially mediated self-healing in biocement

Spencer, Christine and Sass, Henrik 2019. Use of carrier materials to immobilise and supply cementation medium for microbially mediated self-healing in biocement. Presented at: 4th International Conference “Innovative Materials, Structures and Technologies” (IMST 2019), Riga, Latvia, 25 - 27 September 2019. -.

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Abstract

Microbially induced calcium carbonate precipitation (MICP) has been attracting growing interest in respect of its use for biocementation, as a means of improving the engineering properties of granular soil. Recent studies have demonstrated the potential of MICP to enable self-healing of biocement, through the injection of nutrients and precursor chemicals required for MICP into degraded biocement. This paper documents the early stages of research into the development of an autonomous self-healing system for biocement, whereby the nutrients and precursor chemicals are provided from within the biocement matrix. This system has the potential to improve the durability and sustainability of geotechnical structures. The effectiveness of a variety of carrier materials for the immobilisation and release of the nutrients and precursor chemicals, also referred to as the cementation medium, has been explored. Materials tested include expanded perlite, diatomaceous earth and natural fibres such as jute and coir. Studies have subsequently been undertaken to investigate the effect of these carrier materials on the MICP process, in aqueous solutions and within the biocement matrix, and thus the potential to enable self-healing. Ureolytic, spore forming Sporosarcina ureae has been utilised to induce the precipitation of calcium carbonate.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: In Press
Schools: Earth and Ocean Sciences
Engineering
Date of First Compliant Deposit: 15 July 2019
Date of Acceptance: 21 June 2019
Last Modified: 30 Nov 2019 06:15
URI: http://orca.cf.ac.uk/id/eprint/124124

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