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<p>There is a need to explore alternatives for soil improvement and reinforcement, particularly under cyclic loading conditions. The use of recycled aggregates reduces the demand for non-renewable raw materials. Additionally, researchers have increasingly investigated plant fibers as alternative materials, especially rice husk (RH), which is often burned despite its abundance and biodegradability. However, there are limited geotechnical studies on the effectiveness of RH in reinforcing soil and its impact on soil stiffness under dynamic loading. This study investigated the resilient behavior of a clayey soil with different percentages of RH and recycled sand (RS). Natural rice husk was used, by adding 0.5, 1.0, and 1.5% relative to the soil’s dry mass. Next, mixtures were made with the addition of the 10, 20, and 30% of RS about the dry mass of soil. A third stage of mixtures was carried out by adding 0.5% RH and 30% RS, considering the best performance presented by the mixtures of the first and second stages regarding the resilient properties. The resilient modulus (RM) values were determined from triaxial cyclic tests. The highest RM value among all the mixtures realized and compacted at standard (SE) and intermediate (IE) effort was observed in the mixtures with 30% RS (average of 274.52&#xa0;MPa for SE and 408.51&#xa0;MPa for IE). Additional mechanistic analyses were performed to evaluate the use of these materials in paving, showing a higher design life when using a sub-base and base treated with fiber and recycled sand, respectively, compared to untreated soil.</p>

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Evaluation of the Resilient Behavior of Clayey Soil with the Addition of Rice Husk and Recycled Sand for Paving Applications

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Maiky Yamato Kawanami,
  • Weiner Gustavo Silva Costa,
  • Claudia Regina Bernardi Baldin,
  • Monigleicia Alcalde Orioli,
  • Mario Sergio de Souza Almeida,
  • Ronaldo Luis dos Santos Izzo

摘要

There is a need to explore alternatives for soil improvement and reinforcement, particularly under cyclic loading conditions. The use of recycled aggregates reduces the demand for non-renewable raw materials. Additionally, researchers have increasingly investigated plant fibers as alternative materials, especially rice husk (RH), which is often burned despite its abundance and biodegradability. However, there are limited geotechnical studies on the effectiveness of RH in reinforcing soil and its impact on soil stiffness under dynamic loading. This study investigated the resilient behavior of a clayey soil with different percentages of RH and recycled sand (RS). Natural rice husk was used, by adding 0.5, 1.0, and 1.5% relative to the soil’s dry mass. Next, mixtures were made with the addition of the 10, 20, and 30% of RS about the dry mass of soil. A third stage of mixtures was carried out by adding 0.5% RH and 30% RS, considering the best performance presented by the mixtures of the first and second stages regarding the resilient properties. The resilient modulus (RM) values were determined from triaxial cyclic tests. The highest RM value among all the mixtures realized and compacted at standard (SE) and intermediate (IE) effort was observed in the mixtures with 30% RS (average of 274.52 MPa for SE and 408.51 MPa for IE). Additional mechanistic analyses were performed to evaluate the use of these materials in paving, showing a higher design life when using a sub-base and base treated with fiber and recycled sand, respectively, compared to untreated soil.