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Rice husk is a major agricultural byproduct. Among its derivatives, rice husk ash (RHA) and rice husk biochar (RHB) show reinforcement properties in engineering applications. Researchers have developed roofing sheets by reinforcing RHB as an alternative to asbestos sheets. However, producing RHB requires a controlled and costly process. This study investigated the use of RHA as a cost-effective replacement for RHB for reinforcing soil-based roofing. Roofing sheets were prepared using 50% ordinary Portland cement, 39% soil, 10% sand, and 1% reinforcement material. RHB, partially controlled RHA (PC-RHA), and uncontrolled RHA (UC-RHA) were used as reinforcement materials. All samples were cured for 28 days before testing. Breaking load tests revealed the highest load-bearing capacities for UC-RHA at 6.55 kNm⁻1, PC-RHA at 6.27 kNm−1, and RHB at 5.17 kNm−1 in order. The best-performing material, UC-RHA, underwent further evaluation for breaking load, density, water absorption, resistance to acetic acid, and water tightness, in accordance with Sri Lanka Standards (SLS). For validation, three replicate UC-RHA samples were cured for an additional 28 days. Standardized testing confirmed a mean breaking load of 3.205 kNm−1, with satisfactory overall performance for density, water absorption, acidic acid resistance, and water-tightness. Conversely, the standardized tests indicated a lower breaking load strength compared to the initial results. These findings demonstrate that RHA is a feasible replacement for RHB, high-lighting the need for controlled production environments to ensure consistent performance.

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Evaluation of Rice Husk Ash as a Reinforcement Material for the Development of Soil-Based Roofing Sheet

  • 会议论文

  • 发表日期：

    2026年

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  • M. S. H. Karunanayake,
  • S. M. V. P. D. Senanayake,
  • T. N. Fernando,
  • A. J. Fernando,
  • N. P. A. K. G. Pramuditha

摘要

Rice husk is a major agricultural byproduct. Among its derivatives, rice husk ash (RHA) and rice husk biochar (RHB) show reinforcement properties in engineering applications. Researchers have developed roofing sheets by reinforcing RHB as an alternative to asbestos sheets. However, producing RHB requires a controlled and costly process. This study investigated the use of RHA as a cost-effective replacement for RHB for reinforcing soil-based roofing. Roofing sheets were prepared using 50% ordinary Portland cement, 39% soil, 10% sand, and 1% reinforcement material. RHB, partially controlled RHA (PC-RHA), and uncontrolled RHA (UC-RHA) were used as reinforcement materials. All samples were cured for 28 days before testing. Breaking load tests revealed the highest load-bearing capacities for UC-RHA at 6.55 kNm⁻1, PC-RHA at 6.27 kNm−1, and RHB at 5.17 kNm−1 in order. The best-performing material, UC-RHA, underwent further evaluation for breaking load, density, water absorption, resistance to acetic acid, and water tightness, in accordance with Sri Lanka Standards (SLS). For validation, three replicate UC-RHA samples were cured for an additional 28 days. Standardized testing confirmed a mean breaking load of 3.205 kNm−1, with satisfactory overall performance for density, water absorption, acidic acid resistance, and water-tightness. Conversely, the standardized tests indicated a lower breaking load strength compared to the initial results. These findings demonstrate that RHA is a feasible replacement for RHB, high-lighting the need for controlled production environments to ensure consistent performance.