A BACTERIA-BASED AGENT FOR REALIZING COST-EFFECTIVE SELF- HEALING CONCRETE IN LOW TEMPERATURE MARINE ENVIRONMENTS

Author(s): Damian Palin, Mitchell A. A. Geleijnse, Ben A. Abbas, Virginie A. C. Wiktor and Henk M. Jonkers
Paper category: Proceedings
Book title: Proceedings of the Final Conference of RILEM 253-MCI Microorganisms-Cementitious Materials Interactions Volume II
Editor(s): Alexandra Bertron and Henk Jonkers
ISBN: 978-2-35158-207-7 (Set)
ISBN: 978-2-35158-210-7 (Volume 2)
e-ISBN: 978-2-35158-206-0
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 395-404
Total Pages: 308
Language : English

Abstract: The current paper presents a bacterial isolate and organic mineral precursor compound, as part of a cost-effective agent, for realizing self-healing concrete in low temperature marine environments. Organic compounds were screened based on their cost and concrete compatibility, and bacteria isolated based on their ability to metabolize concrete compatible organic compounds and function in a low temperature marine concrete crack. Magnesium acetate was one of the cheapest organic compound screened, and when incorporated (1% of cement weight) in mortar specimens had a low impact on their compressive strength (18% lower than the reference specimens). Bacterial isolate designated psychrophile (PSY) 5 demonstrated very good germination/growth at a salinity of 3% (30 g.l-1 sodium chloride), pH of 9.2, and temperature of 8oC, with sodium lactate as an organic carbon source; and good growth at room temperature with magnesium acetate as the organic carbon source. PSY 5 also demonstrated good spore production capability at room temperature with monosodium glutamate as the organic carbon source. Development of the agent represents an important step on the road to realizing cost-effective bacteria-based self-healing concrete for application in low temperature marine environments.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00