Durability quantification of TiO2 surface coating on concrete and asphalt pavements

David Osborn, Marwa Hassan, Somayeh Asadi, John R. White

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

The use of nanosized titanium dioxide in photocatalytic pavements is a promising approach to combat air pollution. 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 tested 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) method. The experimental program included testing photocatalytic samples in the laboratory for NOx reduction and nitrate accumulation based on the JIS method. Results were compared to the nitrate measurements using the proposed method, and a correlation factor was developed. The developed method was then used to quantify the durability of a TiO2-treated photocatalytic pavement over a 5-month monitoring period under field conditions. Results suggest that the service life of TiO2 coating in concrete is between 6 and 11 months and between 10 and 16 months in asphalt pavements.

Original languageEnglish (US)
Pages (from-to)331-337
Number of pages7
JournalJournal of Materials in Civil Engineering
Volume26
Issue number2
DOIs
StatePublished - Jan 28 2014

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

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