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<p>Investigation of the effect of fillers on pavement performance shows that medical waste (MW) can be used in place of traditional limestone (LS) mineral filler in hot-mix asphalt compositions. Furthermore, warm mix asphalt (WMA) issues with moisture damage and permanent deformation should be resolved. However, the mechanical and durability properties of WMA mixtures containing MW as a mineral filler still need to be determined. This study investigates the viability of using MW in place of LS mineral filler in WMA compositions. WMA mixes were made using 5% synthetic zeolite (by weight of asphalt cement). Two WMA mixes were produced: a reference mix with LS filler at 6% (by weight of aggregate) and another with MW at 6%. The mechanical and durability characteristics that were evaluated included the semi-circle bending test, deformation strength in the Kim test, indirect tension strength, tensile strength ratio (durability), Marshall stability, and Marshall quotient. In contrast to mixtures with LS filler, the results showed that using MW as a filler replacement in WMA mixtures improved Marshall stability and Marshall quotient by 18.45% and 32.52%, respectively. Indirect tensile strength also showed enhancement for both unconditioned and conditioned by 21.67% and 65.81%, respectively; besides, tensile strength ratio and deformation strength were improved by 33.64% and 27.82%, respectively. The parameters in the semi-circular bending test, such as maximum load, total fracture energy, and critical J-integral, all showed a noticeable improvement. This offers advantages like enhanced resistance to cracking, fatigue, and rutting while meeting requirements for Marshall characteristics, moisture susceptibility, deformation strength in Kim, and J-integral. Furthermore, applying life cycle cost analysis revealed that using MW as a mineral filler in WMA mixtures has the potential to save money, preserve landfill space, satisfy sustainable development goals, and address the moisture damage and permanent deformation issues associated with WMA. Furthermore, an optimization table based on the performance measurements performed was created to select the type of mixture for any field applications.</p>

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Comparative Mechanical and Durability Characteristics of WMA Mixtures Made with the Medical Waste Filler and Limestone Filler

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Amal Mohammed Tahir,
  • A. I. AL-Hadidy,
  • Amani A. Al-Ttayiy

摘要

Investigation of the effect of fillers on pavement performance shows that medical waste (MW) can be used in place of traditional limestone (LS) mineral filler in hot-mix asphalt compositions. Furthermore, warm mix asphalt (WMA) issues with moisture damage and permanent deformation should be resolved. However, the mechanical and durability properties of WMA mixtures containing MW as a mineral filler still need to be determined. This study investigates the viability of using MW in place of LS mineral filler in WMA compositions. WMA mixes were made using 5% synthetic zeolite (by weight of asphalt cement). Two WMA mixes were produced: a reference mix with LS filler at 6% (by weight of aggregate) and another with MW at 6%. The mechanical and durability characteristics that were evaluated included the semi-circle bending test, deformation strength in the Kim test, indirect tension strength, tensile strength ratio (durability), Marshall stability, and Marshall quotient. In contrast to mixtures with LS filler, the results showed that using MW as a filler replacement in WMA mixtures improved Marshall stability and Marshall quotient by 18.45% and 32.52%, respectively. Indirect tensile strength also showed enhancement for both unconditioned and conditioned by 21.67% and 65.81%, respectively; besides, tensile strength ratio and deformation strength were improved by 33.64% and 27.82%, respectively. The parameters in the semi-circular bending test, such as maximum load, total fracture energy, and critical J-integral, all showed a noticeable improvement. This offers advantages like enhanced resistance to cracking, fatigue, and rutting while meeting requirements for Marshall characteristics, moisture susceptibility, deformation strength in Kim, and J-integral. Furthermore, applying life cycle cost analysis revealed that using MW as a mineral filler in WMA mixtures has the potential to save money, preserve landfill space, satisfy sustainable development goals, and address the moisture damage and permanent deformation issues associated with WMA. Furthermore, an optimization table based on the performance measurements performed was created to select the type of mixture for any field applications.