Geomechanics and Engineering

  • 제38권4호
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  • Pages.353-366
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  • 2024
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Mechanical and microstructural investigations on cement-treated expansive organic subgrade soil

  • Nazerke Sagidullina (Department of Civil and Environmental Engineering, Nazarbayev University) ;
  • Jong Kim (Department of Civil and Environmental Engineering, Nazarbayev University) ;
  • Alfrendo Satyanaga (Department of Civil and Environmental Engineering, Nazarbayev University) ;
  • Taeseo Ku (Department of Civil and Environmental Engineering, Konkuk University) ;
  • Sung-Woo Moon (Department of Civil and Environmental Engineering, Nazarbayev University)
  • 투고 : 2024.03.05
  • 심사 : 2024.07.15
  • 발행 : 2024.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

Organic soils pose significant challenges in geotechnical engineering due to their high compressibility and low stability, which can result in issues like differential settlement, rutting, and pavement deformation. This study explores effective methods for stabilizing organic soils. Rather than conventional ordinary Portland cement (OPC), the focus is on using environmentally friendly calcium sulfoaluminate (CSA) cement, known for its rapid setting, high early strength development, and environmental benefits. Mechanical behavior is analyzed through 1-D free swell, unconfined compressive strength (UCS), and bender element (BE) tests. Microstructural analyses, including Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), characterize the soil mixed with CSA cement. Experimental results demonstrate improved soil properties with increasing cement dosage and curing periods. A notable strength increase is observed in soil samples with 15% cement content, with UCS doubling after 7 days. This trend aligns with shear wave velocity results from the BE test. SEM and FTIR spectroscopy reveal how CSA cement hydration forms hydrated calcium silicate gel and ettringite, enhancing soil properties. CSA cement is recommended for reinforcing organic subgrade soil due to its eco-friendly nature and rapid strength gain, contributing to improved durability.

키워드

과제정보

Funding: This research was funded by the Nazarbayev University, Collaborative Research Project (CRP) Grant No. 11022021CRP1508 and Faculty Development Competitive Research Grant Program (FDCRGP) Grant No. 20122022FD4115. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of Nazarbayev University.

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