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<p>The impact of sulfur waste on the performance of warm-mix asphalt mixtures has not been reported. Furthermore, by reducing the requirement for raw materials, reducing the cost of extraction, and easing the burden on landfills, the use of waste materials in these combinations improves the advantages to the environment and the economy. Therefore, a comprehensive examination of these combined observations is necessary. The goal of the current research is to investigate the feasibility of utilizing sulfur waste as a mineral filler for warm-mix asphalt mixtures in place of standard mineral filler calcium carbonate and comparing the results with hot-mix asphalt mixtures. The warm asphalt mixes in this study were produced by incorporating 5% synthetic zeolite by weight of asphalt into the asphalt binder. Four types of mixtures were analyzed in this research: Warm mix with calcium carbonate, warm mix with sulfur waste, hot mix with calcium carbonate, and hot mix with sulfur waste. Mechanical tests evaluated included Marshall stability, Marshall quotient, rutting resistance in the Kim test, indirect tensile strength at 25 and 60&#xa0;°C, tensile strength ratio (Durability), and semi-circular bend tests. The tests results of both hot and warm mixtures with sulfur waste revealed an improvement in Marshall stability, Marshall quotient, deformation strength in Kim test, and tensile stiffness modulus, while the value of flow, air voids, the critical rate of strain energy release, and fracture energy decreased compared to the mixtures with calcium carbonate filler. Furthermore, sulfur waste mixtures showed significantly enhanced resistance to moisture-induced deterioration, especially in warm mixtures, and according to the Kim test findings, sulfur waste mixtures showed slight improvement indicating greater resistance for rutting besides greater durability under wheel loading. Consequently, these findings provide advantages such as improved rutting and moisture resistance while meeting the requirements for Marshall characteristics, indicating that using sulfur waste as a mineral filler in asphalt mixtures can potentially lead to cost savings and conserve valuable landfill space while also improving asphalt mixtures’ performance.</p>

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Feasibility of Utilizing Sulfur Waste as a Mineral Filler for Warm-Mix Asphalt

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • AL-Hadidy AI,
  • Husam T. Mahmood

摘要

The impact of sulfur waste on the performance of warm-mix asphalt mixtures has not been reported. Furthermore, by reducing the requirement for raw materials, reducing the cost of extraction, and easing the burden on landfills, the use of waste materials in these combinations improves the advantages to the environment and the economy. Therefore, a comprehensive examination of these combined observations is necessary. The goal of the current research is to investigate the feasibility of utilizing sulfur waste as a mineral filler for warm-mix asphalt mixtures in place of standard mineral filler calcium carbonate and comparing the results with hot-mix asphalt mixtures. The warm asphalt mixes in this study were produced by incorporating 5% synthetic zeolite by weight of asphalt into the asphalt binder. Four types of mixtures were analyzed in this research: Warm mix with calcium carbonate, warm mix with sulfur waste, hot mix with calcium carbonate, and hot mix with sulfur waste. Mechanical tests evaluated included Marshall stability, Marshall quotient, rutting resistance in the Kim test, indirect tensile strength at 25 and 60 °C, tensile strength ratio (Durability), and semi-circular bend tests. The tests results of both hot and warm mixtures with sulfur waste revealed an improvement in Marshall stability, Marshall quotient, deformation strength in Kim test, and tensile stiffness modulus, while the value of flow, air voids, the critical rate of strain energy release, and fracture energy decreased compared to the mixtures with calcium carbonate filler. Furthermore, sulfur waste mixtures showed significantly enhanced resistance to moisture-induced deterioration, especially in warm mixtures, and according to the Kim test findings, sulfur waste mixtures showed slight improvement indicating greater resistance for rutting besides greater durability under wheel loading. Consequently, these findings provide advantages such as improved rutting and moisture resistance while meeting the requirements for Marshall characteristics, indicating that using sulfur waste as a mineral filler in asphalt mixtures can potentially lead to cost savings and conserve valuable landfill space while also improving asphalt mixtures’ performance.