Bacteria based self healing concrete

Document Type : Original Article

Authors

1 Civil engineering, faculty of engineering, Suez canal university, Ismailia .

2 Professor of Properties and Strength of Materials, Civil Department, Faculty of Engineering, Suez Canal University, Ismailia, Egypt

3 Professor of Reinforced Concrete Structures, Civil Department, Faculty of Engineering, Suez Canal University, Ismailia, Egypt

4 Assistant Professor of Concrete Structures, Civil Department, Faculty of Engineering, Suez Canal University, Ismailia, Egypt

Abstract

Two decades of research on concrete self-healing using bacteria, with Sporosarcina pasteurii being one of the best choice due to its fast urease activity and biochemical properties. The optimal dosage is 3kgbacteria beads/m^3 concrete. Bacterial self-healing mortar samples show lower compressive strength, particularly when bacteria are added to concrete water before mixing. Compressive strength decreases with increasing dosage, with a13%,17.14% and 41.6% reduction observed for 3,5and 9kg/m^3 respectively. All of that at an early age and it was found that compressive strength equals control samples at age of 28 days. The bacteria used have proven their efficiency in self-healing concrete to treat cracks up to 2 mm, if they are immersed in water, which makes them of utmost importance in water structures, which is reflected in the calculations of the non-crack section reinforcement. The results indicate that the addition of bacteria in the mixing water before mixing has a great impact on self-healing, its productivity and the effectiveness of calcium carbonate produced by bacteria from its counterpart that uses bacteria beads on its gradually dry condition. Porosity studies showed a reduction in the porosity percentage after self-healing to 0.2% compared to 5.50% in control concrete sample.

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