Enhancement of crack healing efficiency and performance of SAP in biocrete

International Conference on Advances in Materials and Manufacturing Applications 2017

Giriselvam, M.G.^1 ; Poornima, V.^1 ; Venkatasubramani, R.^2 ; Sreevidya, V.^3

Department of Civil Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Amrita University, Coimbatore, India^1

Department of Civil Engineering, Dr. Mahalingam College of Engineering and Technology, Coimbatore, India^2

Department of Civil Engineering, Sri Krishna College of Technology, Coimbatore, India^3

关键词: Bacillus Subtilis;    Bio mineralizations;    Carbonate precipitation;    Durability property;    Efficiency and performance;    Environmental-friendly;    Nutrient medium;    Superabsorbent polymer;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/310/1/012061/pdf
DOI  :  10.1088/1757-899X/310/1/012061

来源: IOP

【 摘 要 】

Concrete usage in Construction becomes more common in this speedy world. Despite its benefits, concrete often exhibits crack which appear due to stresses. Larger cracks cause Structural integrity problems and smaller cracks may result in durability issues. A novel environmental friendly strategy to restore or remediate cracks formed in the structures is bio-mineralization of calcium carbonate using microbes such as Bacillus Subtilis (used in this study), as manual repair and maintenance is costly. In this Paper, an idea of using Super Absorbent Polymer in Bacterial Concrete was analysed which increases the strength and durability properties of concrete and also which acts as a protection to bacteria, where Self-Healing nature is viewed. In the span of 90 days, the results of Bacterial concrete cured under normal water providing nutrients inside with SAP shows healing up to 74 % and without SAP displays 49 % and when it is cured under nutrient medium, Bacterial Concrete having SAP displays healing up to 66 %, whereas without SAP it displays 57.4% of healing. During the observation it is discernible that the crack width ranging from 0.10 mm near 0.45 mm show better self-healing capacity. XRD analysis displays the presence of Calcium carbonate precipitation in cracks.