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<p>Stabilisation of soil using nanomaterials has gained widespread interest in recent years due to its accelerated strength gain. Present study aimed to explore the scope of nanosilica (NS) as secondary additive in strength enhancement of soil with high compressibility characteristics. Lime (L) was used as primary additive at its initial lime content (3%), and NS content varied from 0 to 1%. Atterberg limits, compaction characteristics, free swell index, pH, conductivity and total dissolved solids of the soil modified with L and varying dosage of NS were examined. Further, unconfined compressive strength tests were performed on samples cured for 0,7,14 and 28&#xa0;days. Soil amended with 3% L and 0.75% NS yielded maximum strength. Results from the oedometer tests revealed a reduction in the consolidation coefficient and compression index due to addition of L and NS. NS along with L significantly contributed towards strength enhancement as compared to soil modified with L alone. Additionally, the pH and conductivity properties improved with addition of NS dosage in the soil amended with L. Results from Field emission scanning electron microscopy analysis, X-ray diffraction analysis and Fourier transform infrared spectroscopy analysis explained the role of NS in strength improvement of the soil. Thus, a small quantity of NS added to L modified soil increased its strength manifold proving it to be an excellent secondary additive.</p>

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Contribution of Nanosilica in Early Strength Enhancement of Lime Modified Clay of High Compressibility

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Pavithra Sakthivinayagam,
  • Sivapriya Vijayasimhan,
  • Muniappan Thanikachalam

摘要

Stabilisation of soil using nanomaterials has gained widespread interest in recent years due to its accelerated strength gain. Present study aimed to explore the scope of nanosilica (NS) as secondary additive in strength enhancement of soil with high compressibility characteristics. Lime (L) was used as primary additive at its initial lime content (3%), and NS content varied from 0 to 1%. Atterberg limits, compaction characteristics, free swell index, pH, conductivity and total dissolved solids of the soil modified with L and varying dosage of NS were examined. Further, unconfined compressive strength tests were performed on samples cured for 0,7,14 and 28 days. Soil amended with 3% L and 0.75% NS yielded maximum strength. Results from the oedometer tests revealed a reduction in the consolidation coefficient and compression index due to addition of L and NS. NS along with L significantly contributed towards strength enhancement as compared to soil modified with L alone. Additionally, the pH and conductivity properties improved with addition of NS dosage in the soil amended with L. Results from Field emission scanning electron microscopy analysis, X-ray diffraction analysis and Fourier transform infrared spectroscopy analysis explained the role of NS in strength improvement of the soil. Thus, a small quantity of NS added to L modified soil increased its strength manifold proving it to be an excellent secondary additive.