The potential of bacteria-based crack concrete repair

Concrete is very sensitive to crack formation. Cracks endanger the durability of concrete structures as aggressive liquids and gases may penetrate into the matrix along these cracks and cause damage. Cracks may grow wider and the reinforcement may be exposed to the environment. As wide cracks repair may be required. Biodeposition, a method by which calcium carbonate (CaCO4) precipitation is induced by bacteria, has been proposed as an interesting alternative approach to protect building materials. This liquid-based repair system aims at the sealing of cracks and decrease of the porosity due to the production of a calcium-based biomineral. The system combines advantages of both a traditional repair system for concrete (fast reacting and short term efficiency), and bio-based methods (more sustainable, slow process, and long-term efficiency). In this study a native bacteria that Isolated by Badiee in 3122 Been investigated. According to urease activity by staphylococcus pasteuri possibility of healing concrete was investigated. The results showed that this method can be blocked Concrete cracks completely.

کلیدواژه ها:

Concrete ، Sporosarcina pasteurii ، Calcium carbonate ، Cracks repair