01473513

Component

The use of nano sized titanium dioxide in photocatalytic pavements to combat air pollution has received considerable attention in recent years. Past research focused on the effects of environmental and operational parameters on photocatalytic efficiency and its performance under laboratory and field conditions. Few studies have attempted to quantify the durability of the technology integrated with in-service photocatalytic pavements. This study developed and implemented a new photocatalytic quantification method used to quantify the short term durability of a TiO2 spray application on two pavement surfaces: concrete and asphalt. This was accomplished through developing a nitrate extraction method that could be used on in-service pavements without requiring core extraction. Results of the proposed method were compared to results obtained from the Japanese Industrial Standards: JIS R 1701-1. The experimental program included testing photocatalytic samples in the laboratory for NOx reduction and nitrate accumulation based on JIS R 1701-1. Results were compared to the nitrate accumulation using the proposed method and a correction factor was developed. The developed method was then used to quantify the durability of a TiO2 treated photocatalytic pavement over a five-month monitoring period under field conditions. Results showed that the durability of TiO2 in concrete and asphalt pavements is predicted to be 10 and 14 months, respectively.

This paper was sponsored by TRB committee AF000(2) Pavement Materials and the Urban Climate.

01470560

13-0901

English

18p

2013

Transportation Research Board 92nd Annual Meeting

Digital/other

Figures; Photos; References

Asphalt pavements; Concrete pavements; Durability; Field tests; Laboratory studies; Nitrogen oxides; Sustainable development

Titanium dioxide

Highways; Materials; Pavements; I30: Materials

Transportation Research Board Annual Meeting 2013 Paper #13-0901

TRIS, TRB, ATRI

Feb 5 2013 12:17PM