Mechanical and Microstructural Characteristics of Self-Healing Bacterial Concrete

Abstract

Concrete is a major part of construction material in the world. The major drawback of concrete is easily cracks by low tensile strength. The innovative technology of introducing bacteria in the concrete to self-remediating of cracks in concrete. Formation of calcium carbonate in the crack surface due to the improvement of crack sealing performance. This current study focus on self-healing development of concrete. An MICCP (Microbiologically Induced Calcium Carbonate Precipitation) technique is an occurrence in managing the concrete cracks. Three different cell concentration of bacillus subtilis bacteria (20×105, 20×106 and 20×107 cells/ml) were introducing in concrete specimen, to find the optimum concentration of bacteria cell. From the optimum cell concentration the crack width measurements are carried out at the age of 7 days, 14 days and 28 days respectively. To calculate the crack width by two (Wet &Dry) different methods of healing agents were used. Microbial concrete have that enhancement of compressive and tensile strength. The formation of calcium carbonate was observed and visualized by scanning electron microscopy (SEM). Chemical composition of sample analyzed by energy dispersive spectrometer (EDS). Identification and quantification of bacterial concrete observed by X-ray diffraction (XRD)