Feasibility assessment of newly isolated calcifying bacterial strains in self-healing concrete

Nafeesa Shaheen; Rao Arsalan Khushnood; Shazim Ali Memon; Fazal Adnan

doi:10.1016/j.conbuildmat.2022.129662

Feasibility assessment of newly isolated calcifying bacterial strains in self-healing concrete

Nafeesa Shaheen, Rao Arsalan Khushnood, Shazim Ali Memon, Fazal Adnan

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

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.

Original language	English
Article number	129662
Journal	Construction and Building Materials
Volume	362
DOIs	https://doi.org/10.1016/j.conbuildmat.2022.129662
Publication status	Published - Jan 2 2023

Funding

Authors would like to acknowledge the financial assistance from higher education commission (HEC), Pakistan. For a part of tests, the laboratory and faculty support provided by ASAB and NICE at NUST are appreciated.

Funders	Funder number
National Institute for Health and Care Excellence
Association for the Study of Animal Behaviour
Higher Education Commission, Pakistan

Keywords

Arthrobacter luteolus
Bacillus pumilus
Bacillus safensis
Chryseomicrobium imtechense
Corynebacterium efficiens
Self-healing concrete
Sustainable concrete

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.1016/j.conbuildmat.2022.129662

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title = "Feasibility assessment of newly isolated calcifying bacterial strains in self-healing concrete",

abstract = "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.",

keywords = "Arthrobacter luteolus, Bacillus pumilus, Bacillus safensis, Chryseomicrobium imtechense, Corynebacterium efficiens, Self-healing concrete, Sustainable concrete",

author = "Nafeesa Shaheen and Khushnood, \{Rao Arsalan\} and Memon, \{Shazim Ali\} and Fazal Adnan",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2023",

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doi = "10.1016/j.conbuildmat.2022.129662",

language = "English",

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AU - Shaheen, Nafeesa

AU - Khushnood, Rao Arsalan

AU - Memon, Shazim Ali

AU - Adnan, Fazal

PY - 2023/1/2

Y1 - 2023/1/2

N2 - 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.

AB - 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.

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KW - Bacillus pumilus

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KW - Chryseomicrobium imtechense

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KW - Self-healing concrete

KW - Sustainable concrete

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Feasibility assessment of newly isolated calcifying bacterial strains in self-healing concrete

Abstract

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Keywords

ASJC Scopus subject areas

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