Purification performance of thin layer cover of TiO2 modified asphalt
1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang′an University, Xi′an, Shaanxi 710064, China; 2. Luqiao Inner
Mongolia Co., Ltd., Hohhot, Inner Mongolia 010010, China
Abstract：Based on the catalyzed decomposition ability of nanoTiO2, the thin layer cover of nanoTiO2 modified asphalt was put forward, and the index
system of cumulative decomposition and catalytic performance was defined. A test instrument was developed, and the effects of TiO2 powder size, TiO2 content,
layer thickness, temperature and irradiance on indicator changing trends and influencing degrees were analyzed to determine, the optimal scheme of thickness
and content. The results show that when the TiO2 size is 25 nm with TiO2 content of 10%, the cumulative rate of decomposition and the catalytic efficiency
index reach the maximum values. With the increasing of temperature and irradiance intensity, the performance of decomposition is improved markedly. When the
spray volume is increased, the total gas decomposition is increased with latter stable, while the efficiency is decreased. To obtain good durability
performance, the scheme of material parameters is recommended with TiO2 dosage of 8.5% and thickness of 15.0 mm.
2017, Vol. 38 
