Geomechanics and Engineering

  • 제28권3호
  • /
  • Pages.239-253
  • /
  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Geotechnical behaviour of nano-silica stabilized organic soil

  • Kannan, Govindarajan (Centre for Advanced Research in Environment, School of Civil Engineering, SASTRA Deemed to be University) ;
  • Sujatha, Evangelin Ramani (Centre for Advanced Research in Environment, School of Civil Engineering, SASTRA Deemed to be University)
  • 투고 : 2021.05.14
  • 심사 : 2021.12.01
  • 발행 : 2022.02.10
⟨ 이전 논문 다음 논문 ⟩

초록

Suitable techniques to stabilize organic soil and improve its engineering behaviour are in demand. Despite various alternatives, nano-additives proved to be an effective stabilizer owing to their strength enhancing properties. The study focuses on using nano-silica as a potential stabilizer to improve organic silt. Soil was treated with four dosages of nano-silica namely 0.2%, 0.4%, 0.6% and 0.8% of dry weight of the soil. Nano-silica treated soil showed a strength increase of nearly 25% at a dosage of 0.4% after curing for two hours. Strength of the treated soil improved with age. Strength improved by nearly 62.9% after 28 days of curing and 221.4% after 180 days of curing due to formation of Calcium - Silicate - Hydrate (CSH) gel in the soil matrix. Dosage of 0.6% nano-silica is observed to be the optimum dosage. Coefficient of permeability and compression index showed an increase by 13.32 and 5.5 times respectively owing to aggregation of particles and creation of void spaces as visualized from the scanning electron micrographs. Further model foundation study and numerical parametric studies using PLAXIS 2D indicate that optimized and economic results can be obtained by varying the additive dosage with depth.

키워드

과제정보

The authors thank the Vice Chancellor and the management of SASTRA Deemed University, Thanjavur, India for the support and facilities provided to carry out this work successfully.

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