This document summarizes research on various bacteria that have been used for self-healing cementitious materials. It discusses eight types of bacteria from the genus Bacillus that have shown potential for crack healing in concrete, including Bacillus subtilis, Bacillus sphaericus, and Bacillus megaterium. For each bacteria, it describes the cultivation and preparation process, and how studies have shown they can precipitate calcium carbonate to fill cracks. It also reviews different methods researchers have used to encapsulate bacteria and promote calcium carbonate precipitation in cracked areas. The overall goal of the research is to develop sustainable self-healing concrete using bacteria that can extend the lifespan of concrete structures.