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<p>In this study, evaluation effect of lime stabilised residual soil on soil strength performance was investigated. This study’s primary aim was to evaluate quicklime’s efficacy in stabilising residual soil for road construction purposes. Basic and engineering properties tests were investigated, including modified proctor test and unconfined compressive strength (UCS). Residual soil was stabilised with lime at different dosages of 3%, 5%, 7% and 9% and tested using UCS test. In the first step, the optimal lime content was evaluated through UCS test, and then the consolidated undrained (CU) triaxial test was performed. Even though the maximum UCS value was obtained for 5% lime stabilised soil; the CU tests was continued for unstabilised as well as stabilised soil at 3%, 5%,7% and 9% lime for research purposes. Based on the finding, adding quicklime produced positive results by improving the deviator stress, thus resulting in increased soil strength. The value of cohesion and friction angle of lime stabilised soil followed the same trend of deviator stress, which is increased up to optimum lime content. The stress—strain curve exhibit strain hardening behaviour which no peak deviator stress. Various correlations were proposed for determining the minimum value of shear strength parameters of lime stabilised residual soil to be adopted as road subgrade material. In addition, microstructural analysis showed that lime addition formed the cementation compound that bind lime-soil particles leading to enhance the soil strength. This study’s results may help practitioners effectively use lime to stabilised residual soil for road subgrade construction.</p>

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Enhancing Road Subgrade Strength with Lime Stabilised Residual Soil

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Roslizayati Razali,
  • Mohammad Jawed Roshan,
  • Ahmad Safuan A Rashid,
  • Azman Kassim,
  • Diana Che Lat,
  • Suksun Horpibulsuk,
  • Norshakila Abdul Wahab,
  • Siti Nur Aishah Mohd Noor

摘要

In this study, evaluation effect of lime stabilised residual soil on soil strength performance was investigated. This study’s primary aim was to evaluate quicklime’s efficacy in stabilising residual soil for road construction purposes. Basic and engineering properties tests were investigated, including modified proctor test and unconfined compressive strength (UCS). Residual soil was stabilised with lime at different dosages of 3%, 5%, 7% and 9% and tested using UCS test. In the first step, the optimal lime content was evaluated through UCS test, and then the consolidated undrained (CU) triaxial test was performed. Even though the maximum UCS value was obtained for 5% lime stabilised soil; the CU tests was continued for unstabilised as well as stabilised soil at 3%, 5%,7% and 9% lime for research purposes. Based on the finding, adding quicklime produced positive results by improving the deviator stress, thus resulting in increased soil strength. The value of cohesion and friction angle of lime stabilised soil followed the same trend of deviator stress, which is increased up to optimum lime content. The stress—strain curve exhibit strain hardening behaviour which no peak deviator stress. Various correlations were proposed for determining the minimum value of shear strength parameters of lime stabilised residual soil to be adopted as road subgrade material. In addition, microstructural analysis showed that lime addition formed the cementation compound that bind lime-soil particles leading to enhance the soil strength. This study’s results may help practitioners effectively use lime to stabilised residual soil for road subgrade construction.