01158131

Component

https://doi.org/10.3141/2164-06

http://scholar.google.com...ight&publication_year=2010

Self-cleaning, air-purifying concrete pavement is a rapidly emerging technology that can be constructed with air-cleaning agents with a super-hydrophilic photocatalyst such as titanium dioxide (TiO2). Although this technology has the potential to support an environmentally friendly road infrastructure, several design and operational parameters may affect its effectiveness and need to be evaluated. The objective of this study was to evaluate the environmental and mix design parameters that may affect the effectiveness of the environmental performance of TiO2 coating. An experimental program was conducted: the effects of relative humidity level, flow rate of pollutants, and mix design parameters, including contents of TiO2 and aggregate sizes, were investigated. The environmental efficiency of the samples to remove nitrogen oxides from the atmosphere was measured by using a newly developed laboratory setup. Results of the experimental program showed that the mix designs without fines achieved the highest photodegradation rates. In addition, the increase from 3% to 5% TiO2 resulted in little improvement in the nitrogen oxide removal efficiency, which decreased with the increase in the humidity level and the pollutant flow rate.

01223314

10-0963

English

pp 46-51

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309142960

Print

Figures (5) ; Photos (4) ; References (20)

Air pollution; Air quality management; Coatings; Concrete pavements; Environmental impacts; Humidity; Laboratory tests; Mix design; Nitrogen oxides; Surface course (Pavements)

Photocatalysts; Titanium dioxide

Environment; Highways; Materials; Pavements; I15: Environment; I32: Concrete

TRIS, TRB, ATRI

Jan 25 2010 10:26AM

• Concrete Containing Recycled Concrete Aggregate for Use in Concrete Pavement
• Construction and Performance of Pervious Concrete Overlay at Minnesota Road Research Project
• Cracking Tendency of Bridge Deck Concrete
• Development and Application of Maturity Method for Prediction of Concrete's Resistance to Chloride Ion Penetration
• Development of End-Result Specifications for Concrete in Virginia
• Effects of Soil Clogging and Water Saturation on Freeze–Thaw Durability of Pervious Concrete
• Engineered Cementitious Composites: Can Composites Be Accepted as Crack-Free Concrete?
• Evaluating the Use of Recycled Concrete Aggregate in Pervious Concrete Pavement
• Evaluation of Time of Set for Concrete Mix in Cold Weather with HIPERPAV Wisconsin Model
• Fundamental Investigations into Performance of Carbon-Neutral Rice Husk Ash as Supplementary Cementitious Material
• Grid Types Used to Strengthen Reinforced Concrete Panels Subjected to Impact Loading
• Interlaboratory Study on Measuring Coefficient of Thermal Expansion of Concrete
• Microstructural and Mineralogical Characterization of Cement Kiln Dust–Activated Fly Ash Binder
• New AASHTO T336-09 Coefficient of Thermal Expansion Test Method: How Will It Affect You?
• Porous Concrete Pavements: Mechanical and Hydraulic Properties
• Resistance of Portland Cement Pervious Concrete to Deicing Chemicals