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Clay shale has different characteristics from other rocks. Clay shale has a high shear strength, but rock weathering causes a decrease in the shear strength value due to the hydrosphere or atmosphere. Based on these characteristics, clay shale requires stabilization to increase the shear strength. The materials used for stabilization are environmentally friendly, namely geopolymer and coal waste (fly ash). This research aims to study the effect of fly ash addition and alkali activator on the unconfined compressive strength value. Using a 12 M alkali activator as a mixture of NaOH and Na2SiO3 in a ratio of 2, with a curing age of 7 days, and fly ash variations of 10%, 15%, 20%, and 25%. Studies show that adding fly ash to geopolymer-stabilized clay shale enhanced its compressive strength. The maximum compressive strength at 25% fly ash concentration was 1949.64 kPa. Stabilization of clay shale with fly ash geopolymer has shown more brittle behavior in all specimens. The highest brittleness index of 0.99 is at 25% fly ash. In the unstabilized soil, the modulus of elasticity of the soil (E50) was 17.5 kPa. Stabilisation increased the modulus of elasticity of the soil according to the proportion of fly ash with a maximum E50 of 90.17%.

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Fly Ash Variation’s Effect on Compressive Strength of Geopolymer-Stabilized Clay Shale

  • 会议论文

  • 发表日期：

    2025年

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  • Edi Hartono,
  • Willis Diana,
  • R. A. Ainiyah Fadiyah

摘要

Clay shale has different characteristics from other rocks. Clay shale has a high shear strength, but rock weathering causes a decrease in the shear strength value due to the hydrosphere or atmosphere. Based on these characteristics, clay shale requires stabilization to increase the shear strength. The materials used for stabilization are environmentally friendly, namely geopolymer and coal waste (fly ash). This research aims to study the effect of fly ash addition and alkali activator on the unconfined compressive strength value. Using a 12 M alkali activator as a mixture of NaOH and Na2SiO3 in a ratio of 2, with a curing age of 7 days, and fly ash variations of 10%, 15%, 20%, and 25%. Studies show that adding fly ash to geopolymer-stabilized clay shale enhanced its compressive strength. The maximum compressive strength at 25% fly ash concentration was 1949.64 kPa. Stabilization of clay shale with fly ash geopolymer has shown more brittle behavior in all specimens. The highest brittleness index of 0.99 is at 25% fly ash. In the unstabilized soil, the modulus of elasticity of the soil (E50) was 17.5 kPa. Stabilisation increased the modulus of elasticity of the soil according to the proportion of fly ash with a maximum E50 of 90.17%.