Abstract
Nitrogen oxide (NOx), emitted at the highest rate among automobile exhaust gases, is the main cause of air pollution, and various construction technologies are being developed to reduce NOx emissions. In this study, the NOx reduction effect of surface treatment technology for road pavements, and the effect of the photocatalytic reaction on asphalt pavements, were evaluated using a photocatalyst. Three types of titanium dioxide (TiO2) were used as photocatalysts, and an asphalt rejuvenator used to recover aged asphalt was applied as a surface treatment agent. To evaluate the NOx reduction effect, a test device capable of testing large-sized specimens was manufactured and compared with the ISO method, which only allowed the testing of small specimens. In addition, the effect of TiO2 and the asphalt rejuvenator on the asphalt mixture was analyzed through chemical analysis. The test results of the newly manufactured mixed-tank photo reactor showed the same trend as the ISO test results concerning the evaluation of its NOx removal performance. As a result of the performance evaluation of the surface treatment using TiO2, the NO removal rate was up to 7.83% when Anatase-type TiO2 with excellent light efficiency was applied. In addition, when the rejuvenator was used, the oxidation of asphalt, caused by the photoreaction of TiO2, was reduced.
Highlights
Air pollution has negatively affected various social, environmental, and industrial aspects
To verify the Nitrogen oxide (NOx) decomposition effect of the surface treatment agent applied with TiO2 and an asphalt rejuvenator, bed flow photoreactors and mixed tank photoreactors were fabricated and tested
The effects of the TiO2 and asphalt rejuvenator used as surface treatment agents on asphalt aging were evaluated
Summary
Air pollution has negatively affected various social, environmental, and industrial aspects. Nitrogen oxide (NOx), which is emitted in the highest quantities from automobiles, is known to be harmful to the air environment and to human health It is well known as a harmful gas component that causes diseases of the respiratory system as well as photochemical smog and acid rain [3]. To solve this problem, research has been conducted to reduce exhaust gas emissions from automobiles, and solutions such as the use of clean fuel with fewer pollutants, and the installation of automobile exhaust system purification equipment, have been proposed. Owing to the continuous increase in the number of vehicles operated, the emission of nitrogen oxides continues to steadily increase, and various alternative technologies for reducing NOx emissions are required
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