Feasibility assessment of newly isolated calcifying bacterial strains in self-healing concrete
Shaheen N. Khushnood R.A. Memon S.A. Adnan F.
2 January 2023Elsevier Ltd
Construction and Building Materials
2023#362
In the present study, rarely explored spore former (Bacillus safensis & Bacillus pumilus) and non-spore former (Arthrobacter luteolus, Chryseomicrobium imtechense & Corynebacterium efficiens) alkaliphilic calcifying microbes were evaluated for their prolonged survival in cementitious environment. Extensive experimental program was designed to examine mechanical, self-healing, microstructural modifications and durability of self-healing concrete (SHC). Results of the experimental program endorsed the survival of all bacterial strains in the harsh concrete environment along-with improved mechanical response of matrix. Moreover, investigated strains were capable of precipitating copious amount of calcite having maximum of 0.8 mm average crack healing with 86 % strength recovery. Densification of microstructure was evident from the microstructural evaluation and pore refinement. SHC portrayed a significant resistance of 50 % and 20 % against Cl- penetration and sulphate attack. Conclusively, these strains have potential to impart sustainability in concrete structures by extending the structural life, subsiding repairs cost and conserving the natural resources.
Arthrobacter luteolus , Bacillus pumilus , Bacillus safensis , Chryseomicrobium imtechense , Corynebacterium efficiens , Self-healing concrete , Sustainable concrete
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NUST Institute of Civil Engineering (NICE), School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), Sector H-12, Islamabad, 44000, Pakistan
Department of Civil Engineering, Capital University of Science & Technology (CUST), Islamabad, Pakistan
Department of Civil and Environmental Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana, Kazakhstan
Atta-ur-Rahman School of Applied Biosciences (ASAB), National University of Sciences and Technology (NUST), Sector H-12, Islamabad, 44000, Pakistan
NUST Institute of Civil Engineering (NICE)
Department of Civil Engineering
Department of Civil and Environmental Engineering
Atta-ur-Rahman School of Applied Biosciences (ASAB)
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