Geotechnical properties of bentonite mixed with nanosilica
Bentonite falls under the category of weak and soft clays and has the tendency of large settlement with low shear strength. Such soils are found on several areas of the Earth’s crust making it challenging to carry out various civil engineering projects. For this objective, nanosilica as an additive...
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Veröffentlicht in: | Multiscale and Multidisciplinary Modeling, Experiments and Design Experiments and Design, 2024-07, Vol.7 (3), p.1471-1488 |
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Sprache: | eng |
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Zusammenfassung: | Bentonite falls under the category of weak and soft clays and has the tendency of large settlement with low shear strength. Such soils are found on several areas of the Earth’s crust making it challenging to carry out various civil engineering projects. For this objective, nanosilica as an additive is opted in the present study to improve the geotechnical properties of bentonite. Nanosilica content is varied from 0.2% to 1% by dry weight of bentonite. This study reveals that the liquid limit, plastic limit, dry unit weight and optimum moisture content of bentonite consistently increase with rise in the nanosilica content, whereas unconfined compressive strength and split tensile strength show increment up to optimum nanosilica dosage beyond which the reduction was recorded. Also proportional increase in the strength properties was observed with the curing time. The rate of increase in the plastic limit was on the higher side compared to the liquid limit, which reduced the plasticity index. The percentage increase in the unconfined compressive strength and tensile strength at optimum dose as compared to bentonite is 88.13% and 56.56%, respectively, after 28 days of curing. The compression index and recompression index decreased, while the pre-consolidation pressure increased, respectively, with increase in nanosilica content. Settlement was reduced by 65% at 0.8% nanosilica content in bentonite. Nanosilica acts at nano and micro level, which imparts novel features to modify the physio-chemical properties of the bentonite soil structure. The filling effect by nanosilica particles improved the gradation and formation of extra cementitious gel after hydrolysis improved the bonding properties between the particles. In bentonite-rich regions, the reduced plasticity and improvement in the other properties of the bentonite will facilitate the construction of embankments and consume a large quantity of such material. |
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ISSN: | 2520-8160 2520-8179 |
DOI: | 10.1007/s41939-023-00185-6 |