Аннотации:
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.