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Mechanical properties of the concrete with recycled coarse aggregate surface treated by microbes

Mechanical properties of the concrete with recycled coarse aggregate surface treated by microbes Scarcity in the construction aggregates necessitated the use of suitable alternative materials such as recycled aggregates. However, the higher porosity of recycled aggregates due to the presence of adhered mortar affects its quality resulting in limited utilization. The purpose of this paper is to investigate the use of Bacillus subtilis to enhance the properties of the recycled coarse aggregate (RCA). The strains of the bacterial species were collected from the Gene bank, Chandigarh, and cultured to 105 cells/ml to treat the RCA.Design/methodology/approachThe concrete mixtures are prepared with 0%, 50% and 100% of treated and untreated RCA by mortar mixing approach. The concrete specimens are tested for compressive strength, split tensile strength, flexural strength and elastic modulus at 7, 14 and 28 days, respectively.FindingsMicrobial treatment to RCAs increased the weight of the aggregate and decreased the water absorption of the aggregates. The optimal replacement of RCA was observed to be 50% and the strength of the concrete with 50% of treated RCA was comparable to the normal aggregate concrete. The CaCO3 precipitation by bacterial species fills the pores on the RCA and thus increasing the strength of the concrete.Originality/valueThe originality of the research is to produce concrete with waste recycled aggregate treated by bacteria to overcome the problem of scarcity in construction materials. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png World Journal of Engineering Emerald Publishing

Mechanical properties of the concrete with recycled coarse aggregate surface treated by microbes

S., Jagan; T.R., Neelakantan
World Journal of Engineering , Volume 20 (2): 9 – Mar 8, 2023
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References (42)

Publisher
Emerald Publishing
Copyright
© Emerald Publishing Limited
ISSN
1708-5284
DOI
10.1108/wje-02-2021-0089
Publisher site
See Article on Publisher Site

Abstract

Scarcity in the construction aggregates necessitated the use of suitable alternative materials such as recycled aggregates. However, the higher porosity of recycled aggregates due to the presence of adhered mortar affects its quality resulting in limited utilization. The purpose of this paper is to investigate the use of Bacillus subtilis to enhance the properties of the recycled coarse aggregate (RCA). The strains of the bacterial species were collected from the Gene bank, Chandigarh, and cultured to 105 cells/ml to treat the RCA.Design/methodology/approachThe concrete mixtures are prepared with 0%, 50% and 100% of treated and untreated RCA by mortar mixing approach. The concrete specimens are tested for compressive strength, split tensile strength, flexural strength and elastic modulus at 7, 14 and 28 days, respectively.FindingsMicrobial treatment to RCAs increased the weight of the aggregate and decreased the water absorption of the aggregates. The optimal replacement of RCA was observed to be 50% and the strength of the concrete with 50% of treated RCA was comparable to the normal aggregate concrete. The CaCO3 precipitation by bacterial species fills the pores on the RCA and thus increasing the strength of the concrete.Originality/valueThe originality of the research is to produce concrete with waste recycled aggregate treated by bacteria to overcome the problem of scarcity in construction materials.

Journal

World Journal of Engineering – Emerald Publishing

Published: Mar 8, 2023

Keywords: Bacillus subtilis; Recycled coarse aggregate; Mortar mixing approach; Strength; CaCO3

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