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<p>Steel slag (SS) is an industrial solid waste generated during the steel-making process. In developing countries like India, the disposal of industrial waste such as SS, has become a major challenge. This study explores the suitability of SS as a filler in asphalt mixes. The asphalt mixes comprising SS were designed Marshall mix design and their performance characteristics were compared with those of mixes comprising two conventional fillers (stone dust (SD) and hydrated lime (HL)) and two widely used alternative fillers (fly ash (FA) and Ordinary Portland Cement (OPC)). The engineering performance of asphalt mixes was compared using different methods like cracking tolerance index test, semicircular bending test, moisture susceptibility test, fatigue test, wheel rut test, boiling water test and resilient modulus. The use of SS in place of conventional SD enhanced the Marshall stability, cracking tolerance index, fracture resistance, moisture resistance and rutting resistance of the asphalt mixes by 30%, 71%, 27%, 9% and 34% respectively. This improvement was majorly due to the high porosity, finer nature, and high asphalt-filler interaction of SS filler. Although the SS mixes exhibited relatively lower fatigue life compared to other mixes due to their higher stiffness, their fatigue life was found to be comparable to that of SD mixes when tested at lower strain levels. The overall conclusions of this study confirm the potential of SS as an effective alternative filler, while also providing a sustainable solution for its safe disposal.</p>

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Investigating the Effect of Waste Electric Arc Furnace (EAF) Steel Slag as an Alternative Filler on the Mechanical Properties of Asphalt Mixes

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Shuvrajit Biswas,
  • G. D. R. N. Ransinchung,
  • S. K. Sohel Islam

摘要

Steel slag (SS) is an industrial solid waste generated during the steel-making process. In developing countries like India, the disposal of industrial waste such as SS, has become a major challenge. This study explores the suitability of SS as a filler in asphalt mixes. The asphalt mixes comprising SS were designed Marshall mix design and their performance characteristics were compared with those of mixes comprising two conventional fillers (stone dust (SD) and hydrated lime (HL)) and two widely used alternative fillers (fly ash (FA) and Ordinary Portland Cement (OPC)). The engineering performance of asphalt mixes was compared using different methods like cracking tolerance index test, semicircular bending test, moisture susceptibility test, fatigue test, wheel rut test, boiling water test and resilient modulus. The use of SS in place of conventional SD enhanced the Marshall stability, cracking tolerance index, fracture resistance, moisture resistance and rutting resistance of the asphalt mixes by 30%, 71%, 27%, 9% and 34% respectively. This improvement was majorly due to the high porosity, finer nature, and high asphalt-filler interaction of SS filler. Although the SS mixes exhibited relatively lower fatigue life compared to other mixes due to their higher stiffness, their fatigue life was found to be comparable to that of SD mixes when tested at lower strain levels. The overall conclusions of this study confirm the potential of SS as an effective alternative filler, while also providing a sustainable solution for its safe disposal.