Self healing concrete based on different bacteria: A review

Abstract

Abstract This paper discusses a brief explanation of the different properties of bacterial concrete. In concrete, micro-cracks are inherently present. This causes concrete degradation due to the introduction of deleterious substances into concrete, leading to structural deterioration. Because of this concrete need rehabilitation. Bio-mineralization techniques yield promising results in concrete sealing of the micro cracks. The freshly composed micro-cracks can be sealed up in concrete through perpetual hydration process. Microbiological induced calcite precipitation (MICP) method is more popular to resist the cracks in concrete. The literature indicates that the method of encapsulation can yield greater outcomes than the method of direct application, and also indicates that the use of bacteria will improve the strength and toughness of concrete. Calcite precipitation in concrete results from the introduction of urease stimulate bacteria along with calcium source. The ureolytic bacteria that include Bacillus Pasteurii, Bacillus Subtilis that can give rise to urea are incorporated along with the calcium supply to seal Calcium Carbonate (CaCO3) precipitation from the freshly formed micro cracks. The bacterial concentrations were designed for improved outcomes for the durability of pore formation in concrete. This Paper mainly discusses about the self healing concrete since it was invented to present studies of the researchers.