Recieved:

23/04/2023

Accepted:

05/08/2023

Page: 

1477

1488

doi:

http://dx.doi.org/10.17515/resm2023.744st0423

Views:

1078

Crack healing and flexural behaviour of self-healing concrete influenced by different bacillus species

Chava Venkatesh1, T. Muralidhararao1, Ramamohana Reddy Bellum2

1Department of Civil Engineering, CVR College of Engineering, Hyderabad, 501510.
2Department of Civil Engineering, Aditya Engineering College, Aditya Engineering College (Autonomous), Aditya Nagar, ADB Road, Surampalem-pin:533437, East-Godavari District, Andhra Pradesh, India.

Abstract

The main aim of this investigation is to determine the influence of *Bacillus* species on the crack healing ability and flexural strength of concrete. In this regard, four *Bacillus* species, such as *Bacillus halodurans* (BH), *Bacillus cereus* (BC), *Bacillus licheniformis* (BL), and *Bacillus subtilis* (BS), and two bacterial cell concentrations are selected (viz., 108 and 109 cells/ml of water), and the concrete specimens are cracked with a 65% stress level concentration. To identify the crack healing ability of selected *Bacillus* species, three different curing conditions are adopted: calcium lactate, water, and ambient curing conditions. The ultrasonic pulse velocity test (UPV) has been conducted to identify the crack healing ability of the selected *Bacillus* species. From the results, calcium lactate-based cured concrete specimens showed better UPV values and crack healing ability, whereas *Bacillus halodurans* (BH) effectively filled the crack with calcite precipitation, which is the reason for 90% of crack healing ability and the high flexural strength recovery compared to other selected *Bacillus* species. There is not much difference observed between the bacteria with cell concentrations of 109 and 108; however, 109 has a higher healing ability and recovers flexural strength.

Keywords

Bacillus species; Crack healing; Cell concentration; Flexural strength; Ultra-sonic pulse velocity

Cite this article as: 

Durga CSS, Venkatesh C, Muralidhararao T, Bellum RR. Crack healing and flexural behaviour of self-healing concrete influenced by different bacillus species. Res. Eng. Struct. Mater., 2023; 9(4): 1477-1488.
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