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<p>In recent years, there has been a growing interest to use colored asphalt pavement as an alternative to improve the aesthetic appeal, safety, environmental effects, and functional performance of road surfaces. This alternative approach seeks to relieve heat accumulation in urban areas compared to rural areas by reflecting sunlight and reducing heat absorption, exacerbated by the phenomenon well-known as urban heat island (UHI). Therefore, the colored asphalt pavement supports sustainable urban planning by counteracting the UHI effect by using less heat-absorbing materials like iron oxide (yellow or red) and incorporating it with asphalt mixtures to increase reflection of sunlight and reduce heat retention, thus, it positively affects the rutting deformation (RD). In light of these considerations, this paper aims to study the performance of colored asphalt pavements and their influence on urban heat island mitigation. To meet these requirements, two types of modified asphalt binders distinguished by (olive green and dark maroon) colors were prepared by incorporating iron oxide (yellow or red) at (5%) as a percentage of the asphalt weight as an addendum to pure asphalt, and the following steps were taken. Initially, the mechanical properties of colored asphalt mixtures were obtained using a thorough investigation and compared with the conventional asphalt mixture to assess their strength and performance after adding colored iron oxides. Subsequently, the verification extended to evaluating their durability against moisture damage and severe weather conditions and the extent of color stability in the asphalt mixtures. Finally, it is embarked on verifying whether the use of colored asphalt mixtures had a significant impact on mitigating temperature effect, helping to reduce the UHI effect, enhancing surface reflection, and improving the dynamic stability (DS) and rutting deformation (RD). Based on the results obtained, the performance of the asphalt mixtures was significantly enhanced after using modified asphalt binders distinguished by (olive green and dark maroon) colors. Specifically, and colored asphalt mixtures (M-Olive Green and M-Dark Maroon) improved the rutting deformation (RD) by roughly 20% and 10% and 42%, 31% as well enhanced the dynamic stability (DS) approximately 8%, 27% and 25%, 63% at temperatures 40˚C and 60˚C, while increased the durability index (DI) about 21% and 28%, besides alleviated the temperature effect range of 4&#xa0;°C to 7&#xa0;°C respectively compared to the reference asphalt mixture (M-Ref).</p>

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The Influence of Colored Asphalt Pavements on Urban Heat Island Mitigation and Mechanical Durability

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月20日

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  • Teba Tariq Khaled,
  • Zaynab I. Qasim,
  • Saif Alzabeebee,
  • Mohd Fazaulnizam Bin Shamsudin,
  • Mohd Rasdan Ibrahim,
  • Huzaifa Hashim,
  • Rwayda Kh. S. Al-Hamd

摘要

In recent years, there has been a growing interest to use colored asphalt pavement as an alternative to improve the aesthetic appeal, safety, environmental effects, and functional performance of road surfaces. This alternative approach seeks to relieve heat accumulation in urban areas compared to rural areas by reflecting sunlight and reducing heat absorption, exacerbated by the phenomenon well-known as urban heat island (UHI). Therefore, the colored asphalt pavement supports sustainable urban planning by counteracting the UHI effect by using less heat-absorbing materials like iron oxide (yellow or red) and incorporating it with asphalt mixtures to increase reflection of sunlight and reduce heat retention, thus, it positively affects the rutting deformation (RD). In light of these considerations, this paper aims to study the performance of colored asphalt pavements and their influence on urban heat island mitigation. To meet these requirements, two types of modified asphalt binders distinguished by (olive green and dark maroon) colors were prepared by incorporating iron oxide (yellow or red) at (5%) as a percentage of the asphalt weight as an addendum to pure asphalt, and the following steps were taken. Initially, the mechanical properties of colored asphalt mixtures were obtained using a thorough investigation and compared with the conventional asphalt mixture to assess their strength and performance after adding colored iron oxides. Subsequently, the verification extended to evaluating their durability against moisture damage and severe weather conditions and the extent of color stability in the asphalt mixtures. Finally, it is embarked on verifying whether the use of colored asphalt mixtures had a significant impact on mitigating temperature effect, helping to reduce the UHI effect, enhancing surface reflection, and improving the dynamic stability (DS) and rutting deformation (RD). Based on the results obtained, the performance of the asphalt mixtures was significantly enhanced after using modified asphalt binders distinguished by (olive green and dark maroon) colors. Specifically, and colored asphalt mixtures (M-Olive Green and M-Dark Maroon) improved the rutting deformation (RD) by roughly 20% and 10% and 42%, 31% as well enhanced the dynamic stability (DS) approximately 8%, 27% and 25%, 63% at temperatures 40˚C and 60˚C, while increased the durability index (DI) about 21% and 28%, besides alleviated the temperature effect range of 4 °C to 7 °C respectively compared to the reference asphalt mixture (M-Ref).