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<p>The present study explores the experimental investigation of using Coal Ash (CA) at varying percentages (0%, 9%, 18%, 27% and 36%) as a partial replacement for fine natural aggregate and fillers, sizes ranging from 0.3&#xa0;mm to 0.075&#xa0;mm in the production of dense Hot Mix Asphalt (HMA) mixtures conforming to dense bituminous macadam of Indian Roads Congress Grading- II (IRC-II). The dense HMA mixes of IRC-II was prepared according to Marshall mix design method outlined in ASTM D6927-2015 and performance evaluation were done by using static Indirect Tensile Strength (ITS) test, resistance to moisture damage in connection with Tensile Strength Ratio (TSR), retained stability test and rutting resistance in terms of Marshall quotient (M<sub>q</sub>) &amp; wheel track test. The findings show that the 18% CA in dense HMA increased ITS values with respect to all testing temperature compared to other mixes. Also, dense HMA with 18% CA improved moisture resistance in terms of TSR and retained stability comparing with other mix blends. The M<sub>q</sub> of mixes with 18% CA is higher compared to other mixes showing better stiffness &amp; load distribution capacity of the mix and, lower rut depth shown by the same combination as per wheel track test, which indicates better resistance to rutting compare to other blends of CA &amp; control mix. In addition to performance benefits, the cost analysis revealed that using 18% CA leads to a 1.93% reduction in material costs &amp; 1.08% reduction in overall HMA production cost compared to conventional HMA, offering potential cost savings, especially for large-scale applications. Overall results suggests that incorporating 18% CA is optimal in dense HMA of IRC-II for the replacement of fine aggregates and fillers, which ultimately reduce the burden on natural resources along with environmental advantages.</p>

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Performance of coal ash based hot mix asphalt - an experimental investigation

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Sagar Kailas Sonawane,
  • Arun Kumar Dwivedi,
  • Premanand L. Naktode

摘要

The present study explores the experimental investigation of using Coal Ash (CA) at varying percentages (0%, 9%, 18%, 27% and 36%) as a partial replacement for fine natural aggregate and fillers, sizes ranging from 0.3 mm to 0.075 mm in the production of dense Hot Mix Asphalt (HMA) mixtures conforming to dense bituminous macadam of Indian Roads Congress Grading- II (IRC-II). The dense HMA mixes of IRC-II was prepared according to Marshall mix design method outlined in ASTM D6927-2015 and performance evaluation were done by using static Indirect Tensile Strength (ITS) test, resistance to moisture damage in connection with Tensile Strength Ratio (TSR), retained stability test and rutting resistance in terms of Marshall quotient (Mq) & wheel track test. The findings show that the 18% CA in dense HMA increased ITS values with respect to all testing temperature compared to other mixes. Also, dense HMA with 18% CA improved moisture resistance in terms of TSR and retained stability comparing with other mix blends. The Mq of mixes with 18% CA is higher compared to other mixes showing better stiffness & load distribution capacity of the mix and, lower rut depth shown by the same combination as per wheel track test, which indicates better resistance to rutting compare to other blends of CA & control mix. In addition to performance benefits, the cost analysis revealed that using 18% CA leads to a 1.93% reduction in material costs & 1.08% reduction in overall HMA production cost compared to conventional HMA, offering potential cost savings, especially for large-scale applications. Overall results suggests that incorporating 18% CA is optimal in dense HMA of IRC-II for the replacement of fine aggregates and fillers, which ultimately reduce the burden on natural resources along with environmental advantages.