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Self-repairing of shrinkage crack in mortar containing microencapsulated bacterial spores
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Document Title
Self-repairing of shrinkage crack in mortar containing microencapsulated bacterial spores
Author
Nuaklong P. Jongvivatsakul P. Phanupornprapong V. Intarasoontron J. Shahzadi H. Pungrasmi W. Thaiboonrod S. Likitlersuang S.
Affiliations
Department of Civil Engineering Thammasat School of Engineering Faculty of Engineering Thammasat University Pathumthani12120 Thailand; Center of Excellence in Innovative Construction Materials Department of Civil Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand; Department of Civil Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand; Department of Environmental Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand; Institute of Microbiology Faculty of Veterinary Science University of Veterinary and Animal Sciences Lahore 54000 Pakistan; National Nanotechnology Center (NANOTEC) National Science and Technology Development Agency (NSTDA) Thailand Science Park Pathum Thani12120 Thailand; Centre of Excellence in Geotechnical and Geoenvironmental Engineering Department of Civil Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand
Type
Article
Source Title
Journal of Materials Research and Technology
ISSN
22387854
Year
2023
Volume
23
Page
3441-3454
Open Access
All Open Access Gold
Publisher
Elsevier Editora Ltda
DOI
10.1016/j.jmrt.2023.02.010
Abstract
The purpose of this research work was to evaluate the efficacy of microbially induced calcite precipitation (MICP) method in shrinkage crack repairing. Portland cement was combined with sand bacterial spores water and nutrients to prepare self-healing composites. The microencapsulated bacterial spores were employed as an additive substance at ratios of 0% 0.5% and 1% by weight of cement. Specimens were kept in a climate-controlled room after casting to induce shrinkage crack. Crystalline phases formed in the specimen were identified using the X-ray diffraction (XRD) technique. The scanning electron microscopy/energy dispersive X-ray spectrometry (SEM/EDS) method was used to investigate the morphology of precipitated calcite (CaCO3) crystals. Additionally the specimen s permeability and compressive strength were also determined. When the bacterial spores were added to produce MICP procedure the results demonstrated that it was successful in healing the shrinkage cracking. Within three days the specimen with 1% spores could completely seal the shrinkage crack. According to the XRD patterns the CaCO3 crystals appeared to promote the production of the calcite phase. Based on SEM/EDS investigation the MICP process leads to concentrations of calcite crystal in certain regions especially at the top surface of the crack. The 28-day compressive strength on the other hand decreased owing to the addition of nutrients. ? 2023 The Author(s)
Industrial Classification
Knowledge Taxonomy Level 1
Knowledge Taxonomy Level 2
Knowledge Taxonomy Level 3
License
CC BY-NC-ND
Rights
Authors
Publication Source
Scopus