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<p>The present study uses polyvinyl chloride (PVC) core piles to investigate the effects of unconfined compressive strength (UCS), surface roughness, and core diameter on the interface shear resistance of cement-nanogypsum admixed soil. The experimental tests utilised three distinct unconfined compressive strength (UCS) levels -388&#xa0;kPa, 453.45&#xa0;kPa, and 468.17&#xa0;kPa)- combined with three core diameters of 13&#xa0;mm, 16&#xa0;mm, and 18&#xa0;mm. Each core was meticulously prepared with both smooth and rough surface finishes to assess their influence on performance. The results show that because of improved adhesion, interface shear strength increases with UCS, especially in rough cored piles. Improved interlocking caused by surface roughness increased interface shear strength by 18.19% in comparison to smooth cored piles. Additionally, larger core diameters improved interface shear resistance, especially in rough piles, due to increased compaction. The enhanced shear resistance was justified by the development of cementitious products and denser matrices, as validated by microstructural investigation using X-ray diffraction (XRD) and FESEM. The development of important components such as calcium silicate hydrate (CSH) gel and calcium aluminate hydrate (CAH) gel were detected by Fourier transform infrared (FTIR) analysis, which corroborated the mechanical results. A multivariate linear regression (MLR) model was developed, yielding an R<sup>2</sup> value of 0.9. This high coefficient of determination reflects a strong statistical correlation between the independent variables and interface shear resistance, emphasising the model’s high predictive capability and robustness in accurately characterising the intrinsic interdependencies within the dataset.</p> Graphical Abstract <p></p>

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Interface Shear Behavior of Composite Stiffened Deep Cement Mixing Piles: Insights from Mechanical and Microstructural Analyses

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Tawseef Rasool Haji,
  • Bashir Ahmed Mir

摘要

The present study uses polyvinyl chloride (PVC) core piles to investigate the effects of unconfined compressive strength (UCS), surface roughness, and core diameter on the interface shear resistance of cement-nanogypsum admixed soil. The experimental tests utilised three distinct unconfined compressive strength (UCS) levels -388 kPa, 453.45 kPa, and 468.17 kPa)- combined with three core diameters of 13 mm, 16 mm, and 18 mm. Each core was meticulously prepared with both smooth and rough surface finishes to assess their influence on performance. The results show that because of improved adhesion, interface shear strength increases with UCS, especially in rough cored piles. Improved interlocking caused by surface roughness increased interface shear strength by 18.19% in comparison to smooth cored piles. Additionally, larger core diameters improved interface shear resistance, especially in rough piles, due to increased compaction. The enhanced shear resistance was justified by the development of cementitious products and denser matrices, as validated by microstructural investigation using X-ray diffraction (XRD) and FESEM. The development of important components such as calcium silicate hydrate (CSH) gel and calcium aluminate hydrate (CAH) gel were detected by Fourier transform infrared (FTIR) analysis, which corroborated the mechanical results. A multivariate linear regression (MLR) model was developed, yielding an R2 value of 0.9. This high coefficient of determination reflects a strong statistical correlation between the independent variables and interface shear resistance, emphasising the model’s high predictive capability and robustness in accurately characterising the intrinsic interdependencies within the dataset.

Graphical Abstract