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Titanium dioxide (TiO 2 ) was recently employed to apply onto road surfaces to degrade the harmful compounds from vehicle emissions. However, it remains a challenging task to find a highly compatible pavement type for TiO 2 application to achieve durable and efficient air-purifying performance. This study proposed to coat TiO 2 particles onto semi-flexible pavement surface and tried to investigate an optimum coating method. Three coating methods, including direct mixing TiO 2 (MT) with asphalt mixture, spraying dry TiO 2 (ST) coating and watersolution-based TiO 2 (WT) coating on semi-flexible pavement surface. To achieve this objective, semi-flexible samples were prepared to evaluate and compare the performances of three coating methods by employing resistance to wearing, NO removal efficiency tests and residual texture depth tests. It was found that the ST method not only provided better NO degrading efficiency but also improved the resistance to wearing than the other two methods.

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Ultrathin asphalt mixture used to overlay has better road performance. Asphalt mixture can be mixed and constructed at relatively low temperatures, basing on warm mix technologies, solving issues of the thin overlay fast cool and poor compaction. Warm mix overlays is a fine thin overlay, rutting resistance of concrete and thickness 2~3cm. It composed of high quality modified asphalt, aggregate gradations, warm mix agent and polyester fiber. Indoor experimental research analyzed the performance of warm mix of ultrathin asphalt mixture water stability, high temperature stability, rutting resistance, anti-slide and noise reduction. Tests show that 5% of asphalt, 0.3% mineral fiber is the optimum dosage of warm mixed agent.

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