PURPOSES : About 35% of air pollutant is occurred from road transport. NOx is the primary pollutant. Recently, the importance of NOx removal has arisen in the world. TiO2 is very efficient for removing NOx by photocatalytic reaction. The mechanism of removing NOx is the reaction of photocatalysis and solar energy. Therefore, TiO2 in concrete need to be contacted with solar radiation to be activated. In general, TiO2 concrete are produced by substitute TiO2 as a part of concrete binder. However, 90% of TiO2 in the photocatalysis can not contacted with the pollutant in the air and solar radiation. Coating and penetration method are attempted as the alternative of mixing method in order to locate TiO2 to the surface of structure.
METHODS : The goal of this study was to attempt to locate TiO2 to the surface of concrete, so we can use the concrete in pavement construction. The distribution of TiO2 along the depth were confirmed by basing on the comparison of TiO2 compare by using the EDAX(Energy Dispersive X-ray Spectroscopy).
RESULTS : TiO2 were distributed within 3mm from concrete surface. This distribution of TiO2 is desirable, since the TiO2 induce photocatalysis are located to where they can be contacted with the air pollutant and solar radiation.
CONCLUSIONS : Nano size TiO2 is easily penetration in the top 3mm of concrete surface. By the penetration TiO2 concrete can be produced with the use of only 10% of TiO2, by comparing the mixing types.

• 홍성재(강릉원주대학교 토목공학과 박사과정) | Hong, Sung Jae
• 이승우(강릉원주대학교 토목공학과 교수) | Lee, Seung Woo 교신저자