01456086

Component

https://doi.org/10.3141/2290-20

http://scholar.google.com...born&publication_year=2012

Numerous laboratory studies have demonstrated the ability of nano and ultrafine titanium dioxide (TiO2) photocatalytic pavements to trap and degrade nitrogen oxides in the air when irradiated with ultraviolet light. However, to understand better how photocatalytic pavements will perform under real-world conditions, field studies are necessary. Quantification of the reduction of nitrogen oxides (NOx) in field studies is difficult and challenging because of the many environmental and operating variables. The objective of this paper is to identify evidence of photocatalytic NOx reduction and to determine the environmental and operating factors that affect efficiencies under real-world conditions. A quarter-mile concrete roadway was sprayed with a photocatalytic coating in Baton Rouge, Louisiana. This section was the first field installation of TiO2 photocatalytic pavement in the United States. NOx concentrations were monitored for both the coated and uncoated sections simultaneously for 3 weeks during the spring season to measure photocatalytic degradation directly. Further, nitrates were collected from the coated and uncoated areas for evidence of photocatalytic NOx reduction. Results from both approaches show evidence of photocatalytic NOx reduction. Environmental factors with significant impact on photocatalytic efficiency include relative humidity, solar intensity, and wind speed and direction.

01455586

12-2049

English

pp 154–160

2012

Transportation Research Record: Journal of the Transportation Research Board

9780309223300

Print

Figures; Maps; Photos; References

Coatings; Concrete pavements; Field studies; Nitrates; Nitrogen oxides

Efficiency; Photocatalysis; Titanium dioxide

Baton Rouge (Louisiana)

Design; Environment; Highways; Materials; Pavements; I15: Environment; I22: Design of Pavements, Railways and Guideways; I32: Concrete

TRIS, TRB, ATRI

Dec 4 2012 10:57AM

• Can Soy Methyl Esters Improve Concrete Pavement Joint Durability?
• Development of Laboratory Testing Protocol for Rapid-Setting Cementitious Material for Airfield Pavement Repairs
• Development of Photocatalytic Pervious Concrete Pavement for Air and Storm Water Improvements
• Development of Precision Statement for Concrete Surface Resistivity
• Drying Shrinkage Behavior of Mortars Made with Ternary Blends
• Durability of Pavement Concretes Made with Recycled Concrete Aggregates
• Effect of Recycled Concrete Aggregate Properties on Mixture Proportions of Structural Concrete
• Effects of Deicing Salt Solutions on Physical Properties of Pavement Concretes
• Effects of Sample Preparation and Interpretation of Thermogravimetric Curves on Calcium Hydroxide in Hydrated Pastes and Mortars
• Fingerprinting of Chemical Admixtures in Fresh Portland Cement Concrete by Portable Infrared Spectrometer
• Freeze–Thaw Durability and Salt Scaling Resistance Assessment of Portland Cement Concrete Composite Pavement
• Lowering the Carbon Footprint of Concrete by Reducing Clinker Content of Cement
• Performance of Concrete Incorporating Stone Industry Waste as Aggregates
• Performance of Slag Cement in Hydraulic Cement Concrete
• Predicting Cement–Admixture Incompatibilities with Cement Paste Rheology
• Quantification of Reduction of Nitrogen Oxides by Nitrate Accumulation on Titanium Dioxide Photocatalytic Concrete Pavement
• Reducing Curing Requirements for Pervious Concrete with a Superabsorbent Polymer for Internal Curing
• Reducing Set Retardation in High-Volume Fly Ash Mixtures with the Use of Limestone: Improving Constructability for Sustainability
• Strength and Transport Properties of Concretes Modified with Coarse Limestone Powder to Compensate for Dilution Effects
• Surface Resistivity Measurements Evaluated as Alternative to Rapid Chloride Permeability Test for Quality Assurance and Acceptance