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Tuesday, 20 August 2019
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Raw materials & technologies, Applications

Biomineralised cement pastes: Vegetative bacterial cells impact strength

Thursday, 30 October 2014

Biomineralisation in cement-based materials has become a point of interest in recent years due to the possibility that such an approach could be used to develop a self-healing cement-based system.

American researchers used bacterial solution consisting of urea-yeast extract nutrient medium and vegetative cells to prepare cement pastes. Source: KIT
American researchers used bacterial solution consisting of urea-yeast extract nutrient medium and vegetative cells to prepare cement pastes. Source...

The objective of this study was to investigate the impact of vegetative cells of Sporosarcina pasteurii on the hydration kinetics and compressive strength of cement-based materials.

Increase in calcium carbonate precipitation occurred

The hydration kinetics were greatly influenced when a bacterial solution consisting of urea-yeast extract nutrient medium and vegetative cells was used to prepare bacterial cement pastes; specifically, severe retardation was observed. In addition, an increase in calcium carbonate precipitation, particularly calcite, occurred within the bacterial pastes. Furthermore, after the first day of hydration, the bacterial mortar displayed compressive strength that was similar to or greater than the compressive strength of the neat mortar.

The study is published in: Cement and Concrete Research, Volume 67, January 2015, Pages 237–245

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