Geomechanics and Engineering

  • 제33권4호
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  • Pages.401-414
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  • 2023
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

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Replacing C3S cement with PP fibre and nanobiosilica in stabilisation of organic clays

  • 투고 : 2022.02.04
  • 심사 : 2023.03.23
  • 발행 : 2023.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

Authors would like to express thanks to the Geotechnical community of Urmia University, whom have been working on and documenting the many geoenvironmental aspects of peat across the Urmia Wetland, over the past years. This particular research is conducted independently and did not receive funding from any institution.

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