Geomechanics and Engineering

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Effect of wood pellet fly ash on strength and microstructure of Korean weathered granite soil

  • Jebie A. Balagosa (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Min Jy Lee (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Yun Wook Choo (Department of Civil and Environmental Engineering, Kongju National University) ;
  • Ha Seog Kim (Department of Architectural Engineering, Kongju National University) ;
  • Jin Man Kim (Department of Architectural Engineering, Kongju National University)
  • Received : 2023.12.25
  • Accepted : 2024.07.10
  • Published : 2024.08.25
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Abstract

Low carbon energy demand in South Korea is increasing, hence leading to an increasing usage of wood pellets and the amount of its combustion by-product called wood pellet fly ash (WA). In an effort to develop recycling technology, this research investigates the use of WA as a new sustainable binder for backfill soil materials. The influence of WA on weathered granite soils (WS) is investigated by mixing 5%, 15%, and 25% of WA dosage, compacted at optimum moisture content, then cured for 3, 7, 14, and 28 days. After curing, the compacted specimens were investigated through unconfined compressive tests, pH tests, total suction tests, and microstructural analysis. The findings suggest that the higher the dosage rate, the higher strength and modulus. Additionally, the alkali ions of WA aid in the cementation of WS particles, and newly cementitious minerals are confirmed after 28 curing days. The refinement of pore microstructures led to a denser WS matrix and stiffness improvements. The results validate the binding potential of wood pellet fly ash on weathered granite soils in terms of strength, modulus, and microstructures.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government and Ministry of Science and ICT (MSIT) (No.2021R1A2C2009985).

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