2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference
Mr. Mohamed Lachemi,
Dr. Khandaker Hossain, Ryerson University
Dr. Gideon Wolfaardt, Ryerson University
Dr. Marthinus Kroukamp, Ryerson University
Crack repair in concrete is crucial since cracks are the main cause of the decreased service life of concrete structures. An original and promising way to repair cracks is to pre-incorporate healing agents inside the concrete matrix to heal cracks the moment they appear. By incorporating bacteria and nutrients as a two component healing agent in concrete matrix, the process of bacterially mediated calcium carbonate deposition was triggered upon crack formation and self-healing of cracks can be expected. This research is aimed at investigating the potential of different mineral producing bacteria on their long-term viability, their incorporation in the concrete matrix and their self healing ability for autonomous crack repair. Two different types of bacteria are used to find out the best possible among them. Two different carrier materials are used in this study to protect bacteria from the high-pH environment of concrete. In order to develop a self-healing bacterial concrete, it is crucial to understand how the introduction of the mineral producing bacteria and affect of nutrients on the properties of concrete, giving emphasis on closure of cracks. The long term durability of concrete is affected to a large extend by its permeability. Hence, the permeation properties are the important factors to study in relation to concrete durability. Therefore, this paper presents the results of an experimental investigation carried out to evaluate the influence of bacteria on compressive strength and permeation properties.