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At Auburn University Strategies for Design and Construction of High-Reflectance Asphalt Pavements Nam Tran, Buzz Powell, Howard Marks, Randy West and Andrea.

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Presentation on theme: "At Auburn University Strategies for Design and Construction of High-Reflectance Asphalt Pavements Nam Tran, Buzz Powell, Howard Marks, Randy West and Andrea."— Presentation transcript:

1 at Auburn University Strategies for Design and Construction of High-Reflectance Asphalt Pavements Nam Tran, Buzz Powell, Howard Marks, Randy West and Andrea Kvasnak

2 at Auburn University Outline Urban heat island (UHI) effects Cool pavements and LEED credits SRI and how to measure

3 at Auburn University Background Source: EPA – Cooling Summertime Temperatures

4 What Causes Heat Islands? Source: Trap hot air and reduce wind flow Replace trees with buildings & infrastructures

5 at Auburn University How to Reduce UHI? More trees Reflective and green roofs Cool pavements Efficient cooling systems U of Washington ACROS Fukuoka, JP Ennis Paint

6 at Auburn University How to be “Cool” and Get Awards According to LEED, cool pavement strategies include: –Shading hard surfaces –Using high-reflectance materials –Using open grid or porous pavements LEED awards: –1 credit for “New” and “School” projects for 50% coverage using cool pavements –1 credit for 25%, 2 credits for 50%, and 3 credits for 75% coverage for “Retail” projects

7 at Auburn University Solar Reflectance Index (SRI) A function of reflectance and emittance – –SRI = 100 for standard white surface –SRI = 0 for standard black surface –Reflectance has profound effect on SRI –More information in ASTM E 1980 Higher SRI, lower surface temperature

8 at Auburn University How to Measure Reflectance Field –ASTM E 1918 –Equip.: ~ $2,000 –Mat: 10 ft x 10 ft Laboratory –ASTM C 1549 –Equip.: ~ $30,000 –Core: 6 in. dia

9 at Auburn University Asphalt vs. Concrete Have similar SRI as they get older

10 at Auburn University Thank You


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