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<p>An efficient road network plays a pivotal role in fostering the rapid economic advancement of a nation. It facilitates connectivity to remote regions, enabling diverse transportation activities. The in-situ modification of problematic soil for subgrade preparation is crucial for enhancing its engineering properties and ensuring it meets the required standards. This study primarily aims to assess the technical feasibility of using locally produced biochar from coconut fiber to stabilize expansive clay subgrades in pavement construction. However, limited research exists on the potential of biochar to improve the performance of expansive soil subgrades. Biochar’s distinct attributes, notably its high-water absorbency, have fueled its increasing recognition as a sustainable material for enhancing soil performance. In the present study, we utilized the Design Expert statistical package software Including statistical analysis Analysis of Variance (ANOVA) to conduct experimental design, aiming to explore the relationships between different explanatory variables of this work and response variables. To accomplish this, varying percentages of biochar content (ranging from 1 to 3%) were studied to evaluate their efficacy in treating black cotton soil. The composite with 2% biochar is recommended as an ideal subgrade material for flexible pavements due to improved strength and durability. At this optimum content, Unconfined Compressive Strength (UCS) increased to 840&#xa0;kPa from 520&#xa0;kPa, and California Bearing Ratio (CBR) with extended curing periods, reaching a peak value of 840&#xa0;kPa respectively, compared to the untreated natural soil sample 520&#xa0;kPa. Additionally, the study demonstrated a significant enhancement in CBR values with extended curing, with the soaked CBR increasing by 60% (from 2.5 to 6%) and the unsoaked CBR rising by 52.2% (from 6.5 to 12%). A surface morphology study using electron dispersive X-ray (EDX) and scanning electron microscopy (SEM) analysis was employed to assess the prediction of potential applications for biochar in flexible pavement construction. The test results indicate that biochar is a suitable and sustainable approach for stabilizing expansive soils in road construction projects. Moreover, besides the economic benefits, this method offers a viable and eco-friendly solution for soil stabilization.</p>

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Mechanical Performance of Biochar-Amended Subgrade Soils

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Sunil Priyadarshi,
  • Anil Kumar Sharma

摘要

An efficient road network plays a pivotal role in fostering the rapid economic advancement of a nation. It facilitates connectivity to remote regions, enabling diverse transportation activities. The in-situ modification of problematic soil for subgrade preparation is crucial for enhancing its engineering properties and ensuring it meets the required standards. This study primarily aims to assess the technical feasibility of using locally produced biochar from coconut fiber to stabilize expansive clay subgrades in pavement construction. However, limited research exists on the potential of biochar to improve the performance of expansive soil subgrades. Biochar’s distinct attributes, notably its high-water absorbency, have fueled its increasing recognition as a sustainable material for enhancing soil performance. In the present study, we utilized the Design Expert statistical package software Including statistical analysis Analysis of Variance (ANOVA) to conduct experimental design, aiming to explore the relationships between different explanatory variables of this work and response variables. To accomplish this, varying percentages of biochar content (ranging from 1 to 3%) were studied to evaluate their efficacy in treating black cotton soil. The composite with 2% biochar is recommended as an ideal subgrade material for flexible pavements due to improved strength and durability. At this optimum content, Unconfined Compressive Strength (UCS) increased to 840 kPa from 520 kPa, and California Bearing Ratio (CBR) with extended curing periods, reaching a peak value of 840 kPa respectively, compared to the untreated natural soil sample 520 kPa. Additionally, the study demonstrated a significant enhancement in CBR values with extended curing, with the soaked CBR increasing by 60% (from 2.5 to 6%) and the unsoaked CBR rising by 52.2% (from 6.5 to 12%). A surface morphology study using electron dispersive X-ray (EDX) and scanning electron microscopy (SEM) analysis was employed to assess the prediction of potential applications for biochar in flexible pavement construction. The test results indicate that biochar is a suitable and sustainable approach for stabilizing expansive soils in road construction projects. Moreover, besides the economic benefits, this method offers a viable and eco-friendly solution for soil stabilization.