Bioimmobilized Limestone Powder for Autonomous Healing of Cementitious Systems: A Feasibility Study

For preserving concrete structures and hindering ingress of chemicals through cracks and fissures, repair is inevitable. Microbial calcite precipitation is an intrinsic approach for crack rectification and emulating way of sustainability for reducing anthropogenic greenhouse gases (GHGs) along with...

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Bibliographic Details
Published in:Advances in materials science and engineering 2018-01, Vol.2018 (2018), p.1-9
Main Authors: Shaheen, Nafeesa, Ud din, Siraj, Khushnood, Rao Arsalan
Format: Article
Language:English
Subjects:
Bacteria
Biological activity
Calcite
Cement
Compressive strength
Concrete
Concrete structures
Cracks
Emission analysis
Endurance
Feasibility studies
Field emission microscopy
Formulations
Greenhouse effect
Greenhouse gases
Hydration
Hydrogels
Limestone
Microcracks
Microorganisms
Natural resources
Organic chemistry
Permeability
Raw materials
Repair
Researchers
Scanning electron microscopy
Thermogravimetric analysis
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Summary:For preserving concrete structures and hindering ingress of chemicals through cracks and fissures, repair is inevitable. Microbial calcite precipitation is an intrinsic approach for crack rectification and emulating way of sustainability for reducing anthropogenic greenhouse gases (GHGs) along with conserving the natural resources. In this study, Bacillus subtilis strain is applied for intrinsic repair of concrete’s cracks because of its high pH endurance and capability of sporulation. For prolonged survival of microorganisms, immobilization technique was employed. B. subtilis was immobilized through limestone powder (LSP) before adding into cement matrix. Self-healing proficiency of B. subtilis was deliberated in terms of mechanical strength regain after cracking at 3, 7, 14, and 28 days. To examine the microstructure and characterization of healing precipitate, micrographical (field emission scanning electron microscopy), chemical (energy dispersive X-ray), and thermal (thermogravimetric analysis) analyses were performed after the healing period of 28 days. The results revealed evident signs of calcite precipitation in nano-/microcracks subsequent to microbial activity. Furthermore, immobilized LSP improved the compressive strength of the analyzed formulations.
ISSN:1687-8434
1687-8442
DOI:10.1155/2018/7049121