Enhancement on the properties of recycled coarse aggregate through bio-deposition – An experimental study

Owing to increased population and industrial expansion, the necessity for aggregates in construction is growing rapidly. Conversely, the production of aggregates results in the degradation of natural resources, posing a threat to the construction industry's long-term viability. To counteract th...

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Bibliographic Details
Published inMaterials today : proceedings Vol. 49; pp. 1141 - 1147
Main Authors Jagan, S., Neelakantan, T.R., Padma Lakshmi, M.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.2022
Subjects
Adhered mortar
Bacillus Sphaericus
Bacillus Subtilis
CaCO3 precipitation
Recycled coarse aggregate
Water absorption
Bacillus Sphaericus
Recycled coarse aggregate
Water absorption
Adhered mortar
Bacillus Subtilis
CaCO3 precipitation
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Summary:Owing to increased population and industrial expansion, the necessity for aggregates in construction is growing rapidly. Conversely, the production of aggregates results in the degradation of natural resources, posing a threat to the construction industry's long-term viability. To counteract the above concerns, the use of recycled coarse aggregates (RCA) as a suitable replacement to natural coarse aggregate (NCA) was developed. However, the adherence of mortar on the RCA exhibit higher porosity and that affects the quality of the RCA. So, in this study, the quality of RCA was enhanced through the bio deposition approach by Bacillus Subtilis and Bacillus Sphaericus. The microbes precipitates the CaCO3 that deposit and fills the pores on the surface of RCA. The mechanism resulted in the reduction in the water absorption and increase in the mechanical properties of the RCA. Microstructure investigations affirm the precipitation of CaCO3 by bacterial species that improves the quality of RCA.
ISSN:2214-7853
2214-7853
DOI:10.1016/j.matpr.2021.06.009