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The emission of greenhouse gases (GHG) contributes significantly to ozone layer depletion, with Hot Mix Asphalt (HMA) production being a notable source due to its high temperature requirements (150–180°C). Warm Mix Asphalt (WMA) presents a sustainable alternative by enabling production at temperatures 20–40°C lower. This study evaluates the strength characteristics of HMA and WMA mixes incorporating three fillers—Hydrated lime, Nanoclay, and Alccofine at 2% by weight. Moisture susceptibility was assessed using the Indirect Tensile Strength (ITS) ratio method according to AASHTO T-283. Results indicate that WMA mixes require significantly less Optimum Bitumen Content (OBC) than HMA mixes, offering material and cost savings. Notably, Alccofine, an industrial byproduct, demonstrated superior performance as a filler in WMA mixes under moisture-susceptible conditions. These findings support WMA adoption with appropriate fillers as an environmentally beneficial approach that maintains structural integrity while reducing the carbon footprint of pavement construction.

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Comparative Strength Analysis of Asphalt Mixes Incorporating Varying Fillers

  • 会议论文

  • 发表日期：

    2026年

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  • S. Preethi,
  • P. T. Ravichandran

摘要

The emission of greenhouse gases (GHG) contributes significantly to ozone layer depletion, with Hot Mix Asphalt (HMA) production being a notable source due to its high temperature requirements (150–180°C). Warm Mix Asphalt (WMA) presents a sustainable alternative by enabling production at temperatures 20–40°C lower. This study evaluates the strength characteristics of HMA and WMA mixes incorporating three fillers—Hydrated lime, Nanoclay, and Alccofine at 2% by weight. Moisture susceptibility was assessed using the Indirect Tensile Strength (ITS) ratio method according to AASHTO T-283. Results indicate that WMA mixes require significantly less Optimum Bitumen Content (OBC) than HMA mixes, offering material and cost savings. Notably, Alccofine, an industrial byproduct, demonstrated superior performance as a filler in WMA mixes under moisture-susceptible conditions. These findings support WMA adoption with appropriate fillers as an environmentally beneficial approach that maintains structural integrity while reducing the carbon footprint of pavement construction.