Surface temperature of ten different materials (combination of different commercial TiO₂-based photocatalysis on different types of substrate) located outdoors have been recorded for a 12-hours period using an infrared thermography camera after 2 years of exposure to environmental conditions. Twin conventional pavement‘s substrates (asphalt, and three kinds of tiles) were also evaluated as a reference. A detailed optical, chromatic, and textural characterisation was performed and statistical analysis was carried out to further understand the significance of the parameters that control the surface temperature changes. It generally seems that the mean daily surface temperature and temperature range of the TiO₂ modified materials are lower than their corresponding conventional material. The observed differences on the thermal behavior does not seem to be directly related to the TiO₂ photocatalytic effectiveness. The emissivity values do not show significant variations by the application of the nano-TiO₂ additives. A multivariable correlation has allowed to deduce that main contribution to the lower temperature in the photocatalytic pavements is due to the smoother surface induced by the addition of the photocatalyst.

在暴露于环境条件下两年后，使用红外热像仪记录了位于室外的十种不同材料的表面温度（在不同类型的基材上使用不同的基于商业TiO ₂的光催化组合而成）的表面温度，记录了12小时。还评估了两种传统路面的基材（沥青和三种瓷砖）作为参考。进行了详细的光学，色度和纹理表征，并进行了统计分析，以进一步了解控制表面温度变化的参数的重要性。通常看来，TiO ₂的平均每日表面温度和温度范围改性材料低于其相应的常规材料。观察到的热行为差异似乎与TiO ₂光催化效率没有直接关系。通过使用纳米TiO ₂添加剂，发射率值没有显示出明显的变化。多变量相关性可以推断出，对光催化路面较低温度的主要贡献是由于加入光催化剂而使表面更光滑。