Tensile Strength of Artificially Cemented Sandstone Generated via Microbially Induced Carbonate Precipitation
| Autor: | Fotios Logothetis, Giovanna Biscontin, Charalampos Konstantinou |
|---|---|
| Přispěvatelé: | Konstantinou, Charalampos [0000-0002-4662-5327], Biscontin, Giovanna [0000-0002-4662-5650], Apollo - University of Cambridge Repository |
| Rok vydání: | 2021 |
| Předmět: |
indirect tensile strength
Technology Materials science bio-cementation Article chemistry.chemical_compound Ultimate tensile strength sandstone General Materials Science Composite material Anisotropy Calcite grain size Microscopy QC120-168.85 QH201-278.5 Fracture mechanics Cementation (geology) Engineering (General). Civil engineering (General) Grain size TK1-9971 chemistry Descriptive and experimental mechanics fracture mechanics Fracture (geology) Carbonate Electrical engineering. Electronics. Nuclear engineering TA1-2040 fracture surface |
| Zdroj: | Materials Volume 14 Issue 16 Materials, Vol 14, Iss 4735, p 4735 (2021) |
| DOI: | 10.17863/cam.74649 |
| Popis: | Funder: bp International Centre for Advanced Materials (bp-ICAM) Artificially bio-cemented sands treated with microbially induced calcite precipitation are weakly cemented rocks representing intermediate materials between locked and carbonate sands. Variations in cementation significantly affect the strength of sample, particularly tensile stregth. The modes of fracture and the surface characteristics resulting from the indirect tensile strength tests (Brazilian tests) are strongly correlated with the specimen strength and consequently the degree of cementation. This study examines the tensile strength of bio-cemented fine and coarse sands (average particle diameter 0.18 and 1.82 mm, respectively) and investigates failure modes by recording fracture evolution at both sides of specimen and surface characteristics of the reconstructed surfaces. The dimensionless slope parameter Z2 provided the best fit with respect to tensile strength while the power spectral density was a good indicator of surface anisotropy. Finally, wavelet decomposition allowed for comparison of fracture surface characteristics of the two sands ignoring the grain size effects. |
| Databáze: | OpenAIRE |
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