Document Type
Article
Publication Date
12-2023
Abstract
Highlights
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The present paper studied the effect of biomineralization on the properties of HBr concrete.
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Strength and durability properties are improved by calcite precipitation produced by bacteria.
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CaCO3 Precipitation was confirmed in the microstructure analysis through FESEM and EDS.
Abstract
Cement is the main constituent of the concrete structure. Using rejected brick as pozzolana in replacement of cement reduced the utilization of natural resources, conserved the environment, and controlled waste disposal. Hydrated lime has been utilized as a chemical additive to improve the pozzolanic reaction of finely ground waste brick particles. This research investigates the process of biomineralization to enhance the strength and durability characteristics of bacterial concrete incorporating hydrated lime and brick powder (HBr). In this context, cement was partially replaced with HBr in different proportions 10%, 20%, and 30% by weight. Furthermore, the HBr mixtures were meticulously prepared with and without the incorporation of Bacillus subtilis. Tests for strength and durability were performed at the age of 28 and 56 days of concrete. The self-healing proficiency of the bacterial concrete was evaluated through compressive strength, water permeability, and chloride penetration, while the microstructure analysis was conducted using field emission scanning electron microscopy (FESEM) and energy dispersive spectroscopy (EDS). The results show that at the age of 56 days, CaCO3 precipitation caused by Bacillus subtilis increases the compressive strength of BHBr10 by 19.07%. The durability properties in terms of chloride ion penetrability and water permeability exhibited substantial improvements of 40.03% and 61.9% respectively. Additionally, the FESEM micrographs along with the EDS analysis corroborated the presence of CaCO3 precipitation crystals.
Recommended Citation
Bakr, Mohd Abu, Birendra Kumar Singh, Ahmed Farouk Deifalla, Shatrudhan Pandey, Ahmed Hussain, Adham E. Ragab, Sahir Sultan Alvi, and SM Mozammil Hasnain. "Assessment of the mechanical and durability characteristics of bio-mineralized Bacillus subtilis self-healing concrete blended with hydrated lime and brick powder." Case Studies in Construction Materials 19 (2023): e02672. https://doi.org/10.1016/j.cscm.2023.e02672
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.
Publication Title
Case Studies in Construction Materials
DOI
10.1016/j.cscm.2023.e02672
Comments
Under a Creative Commons license