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Geomechanics and Engineering Volume 33, Number 4, May25 2023 , pages 401-414 DOI: https://doi.org/10.12989/gae.2023.33.4.401 |
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Replacing C3S cement with PP fibre and nanobiosilica in stabilisation of organic clays |
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Soheil Ghadr, Arya Assadi-Langroudi and Hadi Bahadori
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| Abstract | ||
| Organic clays are ideal habitat for flora and fauna. From a geotechnical perspective, organic clays are soft, weak, variable, heterogeneous and flocculated. Portland cement is a universally common stabiliser. However, some organic acids in soil inhibit full hydration and expose cementation products to rapid dissolution. This paper investigates scopes for use of C3S cement to enable durable cementation. Prospects of using PP fibre alongside with C3S cement, scopes for partial replacement of C3S cement with a plant-based nanosilica and evolution of binders are then investigated. Binding mixtures here mimic the natural functions of rhizoliths, amorphous phases, and calcites. Testing sample population include natural and fibre-reinforced clays, compact mixes of clay - C3S cement, clay - nanobiosilica, and clay, C3S cement and nanobiosilica. Benefits and constraints of C3S cement and fibres for retaining the naturally flocculated structure of organic clays are discussed. Nanobiosilica provides an opportunity to cut the C3S content, and to transition of highly compressive organic clays into an engineered, open-structured medium with >0.5 MPa compressive strength across the strains spanning from peak to 1.5-times peak. | ||
| Key Words | ||
| binder; clay; fibre; filler; improvement; organic; peat; structure | ||
| Address | ||
| Soheil Ghadr: GeoLabs Limited, London, U.K. Arya Assadi-Langroudi: Engineering & Construction, University of East London, London, U.K. Hadi Bahadori: Department of Civil engineering, Urmia university, Oroumieh, Iran | ||