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<p>Black cotton (BC) soil, also referred to as expansive soil, is found on a large part of the earth’s surface. Pavements constructed over such BC soil require stabilization to improve its engineering properties. The present study investigates the potential of using corn stalk ash (CSA) as a sustainable stabilizer to improve the properties of BC soil. Various physical and mechanical characterization tests such as Scanning electron microscopic (SEM) and Dispersal X-ray Spectroscopy (EDS), X-ray fluorescence (XRF), Atterberg limit, free swell index (FSI), modified Proctor, California Bearing Ratio (CBR), and unconfined compressive strength (UCS) tests, were conducted on BC soil-CSA blends to determine the optimal dosage of CSA. Investigation revealed that 24% CSA significantly improved the CBR of BC soil from 2.32 to 7.08%, UCS from 95.2&#xa0;kPa to 307.67&#xa0;kPa, and decreased FSI from 60 to 22%. SEM and EDS analyses also confirmed enhanced bonding and reduced void spaces in the stabilized soil matrix. In addition, a finite element (FE) model was developed in ABAQUS 6.14 to evaluate the performance of conventional flexible pavement (CFP) and inverted base pavement (IBP) designed using the stabilized soil. Results showed that IBP reduced the surface vertical deflection by 20% and provided a more durable solution for rut resistance structure. Further Life cycle cost analysis (LCCA) and life cycle assessment (LCA) conducted on CFP and IBP found that IBP had a 30% lower life cycle cost and 53.5% lower carbon emissions than CFP. This research highlights the economic and environmental benefits of using CSA for soil stabilization, offering a novel and sustainable approach for infrastructure projects.</p>

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Evaluating the effectiveness of corn stalk ash as a soil stabilizer for subgrade application with emphasis on life cycle cost analysis and life cycle assessment

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Jitendra Mathankar,
  • Pratik Jaiswal,
  • Sitarami Reddy,
  • Mohan H. Badiger

摘要

Black cotton (BC) soil, also referred to as expansive soil, is found on a large part of the earth’s surface. Pavements constructed over such BC soil require stabilization to improve its engineering properties. The present study investigates the potential of using corn stalk ash (CSA) as a sustainable stabilizer to improve the properties of BC soil. Various physical and mechanical characterization tests such as Scanning electron microscopic (SEM) and Dispersal X-ray Spectroscopy (EDS), X-ray fluorescence (XRF), Atterberg limit, free swell index (FSI), modified Proctor, California Bearing Ratio (CBR), and unconfined compressive strength (UCS) tests, were conducted on BC soil-CSA blends to determine the optimal dosage of CSA. Investigation revealed that 24% CSA significantly improved the CBR of BC soil from 2.32 to 7.08%, UCS from 95.2 kPa to 307.67 kPa, and decreased FSI from 60 to 22%. SEM and EDS analyses also confirmed enhanced bonding and reduced void spaces in the stabilized soil matrix. In addition, a finite element (FE) model was developed in ABAQUS 6.14 to evaluate the performance of conventional flexible pavement (CFP) and inverted base pavement (IBP) designed using the stabilized soil. Results showed that IBP reduced the surface vertical deflection by 20% and provided a more durable solution for rut resistance structure. Further Life cycle cost analysis (LCCA) and life cycle assessment (LCA) conducted on CFP and IBP found that IBP had a 30% lower life cycle cost and 53.5% lower carbon emissions than CFP. This research highlights the economic and environmental benefits of using CSA for soil stabilization, offering a novel and sustainable approach for infrastructure projects.