Improvement of the mechanical properties of mortar and concrete using ureolytic bacteria
| Autor: | Pradip Sarkar, Kirti Kanta Sahoo, Robin Davis, Aparna K. Sathyan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Cement
Materials science Waste management 0211 other engineering and technologies Superplasticizer 02 engineering and technology 021001 nanoscience & nanotechnology Construction industry Mechanics of Materials 021105 building & construction General Materials Science Composite material Mortar 0210 nano-technology Civil and Structural Engineering |
| Zdroj: | Proceedings of the Institution of Civil Engineers - Construction Materials. 171:179-186 |
| ISSN: | 1747-6518 1747-650X |
| DOI: | 10.1680/jcoma.16.00022 |
| Popis: | The construction industry uses cement, the production of which is heavy contributor to carbon dioxide (CO2) emissions and environmental damage. Any method that reduces the usage of cement could thus result in a substantial reduction of the overall carbon dioxide footprint of final cement-based products. In this study, ureolytic bacteria were used to improve the different properties of cement mortar and concrete. Properties such as compressive strength and sorptivity were studied experimentally. The experimental results showed that the compressive strength of both cement mortar and concrete increased with an increase in bacterial concentration due to microbiologically induced mineral precipitation. An optimum bacterial dosage of 107 colony-forming units (CFU)/ml was found for the maximum increase in compressive strength for both mortar and concrete. Capillary water absorption was also found to be lower for the bacterial specimens at the optimum dosage compared with that of the control specimens. Microstructural analysis, X-ray powder diffraction and field emission scanning electron microscopy confirmed the microbiologically induced mineral precipitation. |
| Databáze: | OpenAIRE |
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