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<p>The application of geopolymer binders utilizing fly ash (FA) and ground granulated blast furnace slag (GGBFS) as precursors for ground improvement has recently become increasingly popular as a substitute for cement. However, geopolymer binders depend on various factors with their levels to obtain a better response. Hence, the current&#xa0;study employs the Taguchi method to obtain optimal mix design of FA-GGBFS-based geopolymer stabilizer (GS) and investigates the effect of optimal FA-GGBFS-based GS as a long-term stabilizer for enhancing engineering properties of block cotton soil (BCS). The experiments use Taguchi’s L9 orthogonal array consisting of four parameters and three levels. The selected parameters are alkaline-to-binding agent ratio (Al/Bi), ratio of Na<sub>2</sub>SiO<sub>3</sub>/NaOH, molarity of NaOH, and different percentages of superplasticizer to achieve a maximum compressive strength of GS. The binder content for GS is kept at 450 kg/m<sup>3</sup> with FA/GGBFS ratio 50:50. The optimum parametric combination was found at Al/Bi ratio 0.35, Na<sub>2</sub>SiO<sub>3</sub>/NaOH 2.5, NaOH 10&#xa0;M, and percentage of superplasticizer 0.5. The compaction characteristics, California bearing ratio (CBR), unconfined compressive strength (UCS), and differential free swelling index (DFS) of BCS were investigated with various concentrations of optimized GS mix (8%,10%, 12%, and 14%). The findings show that the&#xa0;compaction properties, CBR, UCS, and DFS of treated BCS were&#xa0;significantly enhanced by increasing&#xa0;the dosages of the optimized GS mix. The results of microstructural analysis on treated BCS show the presence of cementitious products which leads to better performance as compared to untreated BCS.</p>

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Mechanical and Swelling Properties of Black Cotton Soil Treated with Optimized Geopolymer Stabilizer: An Experimental Investigation

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Udit Narayan Bhoi,
  • Padmabati Sahoo,
  • Biswajit Majhi

摘要

The application of geopolymer binders utilizing fly ash (FA) and ground granulated blast furnace slag (GGBFS) as precursors for ground improvement has recently become increasingly popular as a substitute for cement. However, geopolymer binders depend on various factors with their levels to obtain a better response. Hence, the current study employs the Taguchi method to obtain optimal mix design of FA-GGBFS-based geopolymer stabilizer (GS) and investigates the effect of optimal FA-GGBFS-based GS as a long-term stabilizer for enhancing engineering properties of block cotton soil (BCS). The experiments use Taguchi’s L9 orthogonal array consisting of four parameters and three levels. The selected parameters are alkaline-to-binding agent ratio (Al/Bi), ratio of Na2SiO3/NaOH, molarity of NaOH, and different percentages of superplasticizer to achieve a maximum compressive strength of GS. The binder content for GS is kept at 450 kg/m3 with FA/GGBFS ratio 50:50. The optimum parametric combination was found at Al/Bi ratio 0.35, Na2SiO3/NaOH 2.5, NaOH 10 M, and percentage of superplasticizer 0.5. The compaction characteristics, California bearing ratio (CBR), unconfined compressive strength (UCS), and differential free swelling index (DFS) of BCS were investigated with various concentrations of optimized GS mix (8%,10%, 12%, and 14%). The findings show that the compaction properties, CBR, UCS, and DFS of treated BCS were significantly enhanced by increasing the dosages of the optimized GS mix. The results of microstructural analysis on treated BCS show the presence of cementitious products which leads to better performance as compared to untreated BCS.