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 journalArticlepeer-review

6 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 languageEnglish
Article number129662
JournalConstruction and Building Materials
Volume362
DOIs
Publication statusPublished - Jan 2 2023

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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