Abstract
AbstractBacteria-induced mineral precipitation is an environmentally friendly technology to enhance the self-healing ability of concrete cracks. However, the self-healing capacity of concrete was improved at the expense of extra bacteria-based additives incorporated into a concrete matrix, and the influence of bacteria-based additives on a concrete matrix has not been fully understood. The objective of this work was to investigate the effects of bacteria-based additives on the properties of a cement paste matrix. Two types of bacteria-based additives (Type 1 and Type 2) were developed to improve the concrete self-healing capacity mainly achieved by bacteria-induced mineral precipitations. The mineral precipitations induced by two types of bacteria-based additives in the liquid medium were analyzed with a scanning electron microscope (SEM) and X-ray diffraction (XRD). Then, the crack-healing capacity of cement paste specimens with both bacteria-based additives was evaluated on the basis of area repairing r...
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