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<p>The utilization of agricultural waste materials as soil stabilizers has recently received much attention due to their environmental and economic benefits. This study explores the potential of the incorporation of rice straw ash (RSA) with cement for soil stabilization in the Mekong Delta, Vietnam, where many soft soil types and an abundant source of RSA are present. The objective of the study was to investigate the unconfined compressive strength (UCS) of soil stabilized by cement and RSA. Additionally, scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed to analyze the microstructure of the stabilized soil. The research findings revealed that RSA can significantly enhance the UCS of soil–cement mixtures. Besides enhancing strength, RSA can be an alternative to replace 10% of the cement in soil improvement. The SEM images and XRD results confirmed the formation of a Calcium Silicate Hydrate (C-S-H) gel and a denser microstructure upon incorporation of RSA into the stabilized soil. The research also reported that incorporating RSA affected both the strength development and elastic modulus of the soil-cement mixture. This study revealed that RSA could be a sustainable and cost-effective approach in soil stabilization while addressing the challenge of agricultural waste management.</p>

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Applicability of rice straw ash incorporation with cement for soft soil improvement in the Mekong Delta, Vietnam

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • Nguyen Thanh Duong,
  • Dang Van Phi,
  • Bui Van Duc,
  • Piotr Osinski

摘要

The utilization of agricultural waste materials as soil stabilizers has recently received much attention due to their environmental and economic benefits. This study explores the potential of the incorporation of rice straw ash (RSA) with cement for soil stabilization in the Mekong Delta, Vietnam, where many soft soil types and an abundant source of RSA are present. The objective of the study was to investigate the unconfined compressive strength (UCS) of soil stabilized by cement and RSA. Additionally, scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed to analyze the microstructure of the stabilized soil. The research findings revealed that RSA can significantly enhance the UCS of soil–cement mixtures. Besides enhancing strength, RSA can be an alternative to replace 10% of the cement in soil improvement. The SEM images and XRD results confirmed the formation of a Calcium Silicate Hydrate (C-S-H) gel and a denser microstructure upon incorporation of RSA into the stabilized soil. The research also reported that incorporating RSA affected both the strength development and elastic modulus of the soil-cement mixture. This study revealed that RSA could be a sustainable and cost-effective approach in soil stabilization while addressing the challenge of agricultural waste management.