Replacing C₃S Cement with PP Fibre and Nanobiosilica in Stabilisation of Organic Clays

Article


Ghadr, S., Assadi Langroudi, A. and Bahadori, H. 2023. Replacing C₃S Cement with PP Fibre and Nanobiosilica in Stabilisation of Organic Clays. Geomechanics and Engineering. 34 (4), pp. 401-414. https://doi.org/10.12989/gae.2023.33.4.401
AuthorsGhadr, S., Assadi Langroudi, A. and Bahadori, H.
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.

JournalGeomechanics and Engineering
Journal citation34 (4), pp. 401-414
ISSN2005-307X
Year2023
PublisherTechno-Press
Accepted author manuscript
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Anyone
Digital Object Identifier (DOI)https://doi.org/10.12989/gae.2023.33.4.401
Publication dates
Online25 May 2023
Publication process dates
Accepted23 Mar 2023
Deposited22 Jun 2023
Copyright holder© 2023, Techno-Press
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