The conventional bitumen, which is very sensitive to temperature, used in roads construction has very low thermal conductivity due to which heat absorbed is accumulated within it and a very less fraction of it is dissipated. Nanotechnology was introduced to overcome this issue where bitumen was modified by several metallic oxide powders at nanoscale. Nano-TiO₂, nano-ZnO and nano-Al₂O₃ were mixed with bitumen separately to examine their ability to enhance its property to dissipate heat. Experiments were carried out on the unmodified and modified samples of bitumen and their corresponding asphalt mixes in heat sinks to study the behavior of heat transfer. Heat sink containing sample was thermally charged for 180 min with different heat fluxes of 0.8 kW/m², 1.0 kW/m² and 1.2 kW/m², all at constant charging rates followed by cooling/ discharging for 120 min. Temperature curves against time for the whole charging/ discharging cycle indicated that the bitumen and asphalt, each modified with metal oxide nanopowders, showed a maximum heat dissipation of 14% to 16% as compared to unmodified samples after complete charging. Moreover, the discharging phase of the curves showed that the nano modified specimens had a steadier temperature drop than the virgin specimens endorsing the improvement in their heat dissipation property.

道路施工中使用的对温度非常敏感的传统沥青的导热系数非常低，这是因为吸收的热量会在其中蓄积，并且很少一部分被散发。引入纳米技术来克服这个问题，在沥青中沥青被多种金属氧化物粉末改性。将纳米TiO ₂，纳米ZnO和纳米Al ₂ O ₃分别与沥青混合，以检验其增强其散热性能的能力。在散热器中对未改性和改性的沥青样品及其相应的沥青混合料进行了实验，以研究传热行为。装有样品的散热器以0.8 kW / m的不同热通量充热180分钟²，1.0千瓦/米²和1.2千瓦/米²，在所有充电恒定速率接着冷却/放电120分钟。在整个充电/放电循环中随时间变化的温度曲线表明，分别用金属氧化物纳米粉改性的沥青和沥青与完全充电后的未改性样品相比，显示出最大散热量为14％至16％。此外，曲线的放电阶段表明，纳米改性的样品比原始样品具有更稳定的温度下降，这表明它们的散热性能得到了改善。