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pp.53-62
PURPOSES : This research was a fundamental study on the application of an integral TiO2 solution to asphalt concrete pavement. The integral TiO2 solution was produced in pilot production equipment; application of the integral TiO2 solution to asphalt pavement was conducted to examine the pollution-reducing capability of photocatalytic compounds such as TiO2. The photocatalytic TiO2 reacted with air pollutants, converting them into small amounts of relatively benign molecules. METHODS : In this study, laboratory experiments were conducted using five various testing methods. Tensile strength ratio (TSR) and British pendulum test (BPT) were conducted in order to evaluate the properties of asphalt pavement subsequent to the integral TiO2 solution coating. In addition, methylene blue testing, a measurement of nitrate on the coated pavement, and nitrogen oxide (NOx) reduction testing were conducted in order to evaluate photocatalytic reaction. Lastly, a UV-A lamp was used as a light source for photocatalytic reactions. RESULTS : Test results indicated no change in the properties of asphalt pavement following the integral TiO2 solution coating. In order to evaluate the performance of asphalt pavement as a function of TiO2, the moisture susceptibility and skid resistance were investigated. The moisture susceptibility and skid resistance satisfied there quirements related to pavement quality and safety specification. Furthermore, the effects of reduction of air pollution were significantly improved as determined via the methylene blue test and NOx reduction test. The TiO2-paved asphalt specimen exhibited approximately 43% reduction of NOx. CONCLUSIONS : This study has suggested that applying TiO2 rarely impacts asphalt pavement performance measures such as moisture susceptibility and skid resistance, and that its application may be a better means of reducing air pollution. Further studies, such as proper TiO2 dosage rates and compatibility with various pavement types, are required to broaden and generalize its application.
