An Experimental Investigation on Self-Healing Concrete Incorporating Marble Dust as Fine Aggregate Replacement

Concrete plays a vital role as a construction material in the world. New technologies have helped to develop new types of construction and alternative materials in the concrete area. As society makes determined moves towards sustainability, construction has a very important role to play within this new agenda, not only because of its economic and social contribution, but also because of its impact on the quality of our lives, our comfort and safety. This project presents the results of an experimental investigation carried out to evaluate the influence of Bacillus Subtilis and Bacillus Licheniformis on the compressive strength, water absorption and its self-healing properties. An attempt is made to heal these cracks by the addition of the bacteria in the concrete and also to increase of the strength of the concrete. Each bacteria of concentration are added. Tests were performed at the ages of 7, 28 and 56 days. The applicability of specifically calcite mineral precipitating bacteria to fill the cracks in concrete and the bacteria chosen must have the self-healing capacity and the bacteria used must be nonpathogenic and sustainable. It is found that the cracks in the concrete have been healed and the formation of calcite precipitation is observed using Scanning Electron Microscopy (SEM). In the present project here is an attempt made to fill the cracks with the help of bacteria which has a self- healing property along with fine aggregate as marble dust. The potential bacteria are isolated and cultured. The optimum parameter will be considered and the bacterial liquid is being coated on cracked surface of concrete and the variation in the strength and the durability characteristics will be studied. Calcite formation of isolated bacteria which can produce calcite precipitates on suitable media supplemented with a calcium source. Usage of bacteria like Bacillus Subtilis, Bacillus Licheniformis improves the strength and durability of concrete through self-healing effect.