Development and Performance of Bacterial Self-healing Concrete - A Review

14th International Conference on Concrete Engineering and Technology

Hizami Abdullah, Muhd Afiq^1 ; Harmiza Abdullah, Nurul Ain^1 ; Tompang, Mohamad Fahrurrazi^2

Fakulti Teknologi Kejuruteraan, Universiti Malaysia Perlis, Malaysia^1

School of Bioprocess, Universiti Malaysia Perlis, Malaysia^2

关键词: Cement mortars;    Chloride migrations;    Concrete strength;    External sources;    Nutrient addition;    Nutrients concentrations;    Properties of concretes;    Self-healing concretes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/431/6/062003/pdf
DOI  :  10.1088/1757-899X/431/6/062003

来源: IOP

【 摘 要 】

Self-healing concrete is a type of concrete that able to autogenously fill up cracks without any intervention from external sources. Various methods of producing a self-healing concrete are available in the previous researches but using bacterial as self-healing agent enables the concrete to be environmentally friendly. This paper reviews the elements that are important in developing a bacterial self-healing concrete. The elements include type of bacteria and the criteria needed in selecting a bacteria as source of healing agent. Most of the researches used Bacillus genus but quite a few have produced bacterial self-healing concrete from non-axenic bacteria. There are also various bacteria and nutrients concentration being incorporated inside self-healing concrete which resulted in wide range of performance. Most of the researches indicates that addition of bacteria with or without nutrients affect mechanical properties of concrete negatively. However some of the studies indicates the opposite result on mechanical strength. Hence, the influence of bacterial and nutrient addition on concrete strength would also depends on the method of incorporating them. Permeability of concrete could also be improved by the addition of selfhealing bacteria. The permeability has been measured in term of chloride migration, gas permeability and carbonation which indicates enhancement compared to plain cement mortar.