Abstract—The aim of this research project is the development of durability of concrete in which integrated bacteria promote self-healing of cracks. Traditional concrete does usually show some self-healing capacity what is due to excess non-hydrated cement particles present in the material matrix. These particles can undergo secondary hydration by crack ingress water resulting information of fresh hydration products which can seal or heal smaller cracks. However, the integration of excess cement in concrete is unwanted from both an economical and environmental viewpoint. Cement is expensive and moreover, its production contributes significantly to global atmospheric CO2 emissions. In this study durability of concrete is developed by self-healing system in which bacteria converts the metabolic organic compounds to calcite. The result has been expected that the ingress water channeled through freshly formed cracks activate present bacteria which through metabolic conversion of organic mineral-precursor compounds produce copious amounts of calcite. The self-healing capacity of this system is currently being quantified what should result in an estimate of the materials durability increase. A self-healing concrete may be beneficial for both economical and environmental reasons. The bacteria based concrete proposed here could substantially reduce maintenance, repair and premature structure degradation what not only saves money but also reduces atmospheric CO2 emissions considerably as less cement is needed for this type of self-healing concrete.
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