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<p>Hot Mix Asphalt (HMA) experiences degradation due to the combined effects of cyclic traffic loading, thermal variations, and moisture exposure. While various additives have been formulated to enhance HMA durability, individual additives often fail to demonstrate adequate performance across diverse environmental exposures. This investigation employed a dual-additive approach incorporating Carbon Fiber (CF) and Nano-silica (NS) to enhance the durability and mechanical characteristics of asphalt mixtures. The study incorporated CF concentrations ranging between 0.1 and 0.5% relative to total mixture weight, while NS concentrations ranged between 2 and 10% relative to binder weight. Evaluation of the modified mixtures encompassed mechanical and durability assessments through ITS, WLT, M.I., and TSR testing protocols, complemented by SEM, EDX, and ANOVA analytical techniques. Results indicated that CF at 0.3% concentration enhanced crack resistance, while NS at 8% concentration demonstrated superior moisture durability; there was also found to be synergistic interaction between these two modifiers that enhanced durability, stiffness, and crack resistance while having an initial cost higher than the control but with superior performance (i.e., longer service life), which may indicate technical feasibility as well as economic viability for using a dual-modified mixture in modern pavement applications.</p>

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Experimental study of asphalt mixtures modified with carbon fiber and nano silica

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Marwa Sabry,
  • Moustafa Abdelsalam,
  • Ahmed Gamal,
  • Mohamed Samir Eisa

摘要

Hot Mix Asphalt (HMA) experiences degradation due to the combined effects of cyclic traffic loading, thermal variations, and moisture exposure. While various additives have been formulated to enhance HMA durability, individual additives often fail to demonstrate adequate performance across diverse environmental exposures. This investigation employed a dual-additive approach incorporating Carbon Fiber (CF) and Nano-silica (NS) to enhance the durability and mechanical characteristics of asphalt mixtures. The study incorporated CF concentrations ranging between 0.1 and 0.5% relative to total mixture weight, while NS concentrations ranged between 2 and 10% relative to binder weight. Evaluation of the modified mixtures encompassed mechanical and durability assessments through ITS, WLT, M.I., and TSR testing protocols, complemented by SEM, EDX, and ANOVA analytical techniques. Results indicated that CF at 0.3% concentration enhanced crack resistance, while NS at 8% concentration demonstrated superior moisture durability; there was also found to be synergistic interaction between these two modifiers that enhanced durability, stiffness, and crack resistance while having an initial cost higher than the control but with superior performance (i.e., longer service life), which may indicate technical feasibility as well as economic viability for using a dual-modified mixture in modern pavement applications.