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<p>Chemical soil stabilisation is an effective geotechnical method for improving the strength and bearing capacity of soft soils, particularly for road construction projects. This research investigates the potential of nickel slag (NS) as a stabilisation agent by evaluating its physical, mechanical, and microstructural properties. Laboratory tests were conducted in accordance with ASTM and AASHTO standards. These included physical tests such as sieve analysis, specific gravity, and the Atterberg limits, as well as mechanical tests such as the compaction test, the unconfined compressive strength (UCS) test, and the California Bearing Ratio (CBR) test. Nickel slag (NS) was added at 3%, 6%, 9%, and 12% by weight of the dry soil and mixed at the optimum moisture content to ensure uniform particle distribution. The mechanical test results showed that varying the NS content and curing time significantly increased the soil’s strength. After 28 days of curing, the Q and CBR rates increased by 3.5-fold and 5.6-fold, respectively, with the soil containing 6% NS showing the promising performance. Microstructural analysis revealed that lower<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{\varvec{X}}_{\varvec{c}}\)</EquationSource> </InlineEquation>, a smaller <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:\varvec{D}\)</EquationSource> </InlineEquation> distribution and a reduction in particle size had contributed to the increase in strength. These results suggest that NS is a promising, sustainable alternative material for stabilising soft soils in geotechnical applications.</p>

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The mechanical characteristics, structural properties and microstructure change of soft soil stabilized with nickel slag variation for road construction

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Ichsan Rauf,
  • Abdul Gaus,
  • Mufti Amir Sultan,
  • Bulkis Musa,
  • Heryanto Heryanto

摘要

Chemical soil stabilisation is an effective geotechnical method for improving the strength and bearing capacity of soft soils, particularly for road construction projects. This research investigates the potential of nickel slag (NS) as a stabilisation agent by evaluating its physical, mechanical, and microstructural properties. Laboratory tests were conducted in accordance with ASTM and AASHTO standards. These included physical tests such as sieve analysis, specific gravity, and the Atterberg limits, as well as mechanical tests such as the compaction test, the unconfined compressive strength (UCS) test, and the California Bearing Ratio (CBR) test. Nickel slag (NS) was added at 3%, 6%, 9%, and 12% by weight of the dry soil and mixed at the optimum moisture content to ensure uniform particle distribution. The mechanical test results showed that varying the NS content and curing time significantly increased the soil’s strength. After 28 days of curing, the Q and CBR rates increased by 3.5-fold and 5.6-fold, respectively, with the soil containing 6% NS showing the promising performance. Microstructural analysis revealed that lower \(\:{\varvec{X}}_{\varvec{c}}\) , a smaller \(\:\varvec{D}\) distribution and a reduction in particle size had contributed to the increase in strength. These results suggest that NS is a promising, sustainable alternative material for stabilising soft soils in geotechnical applications.