New Approach to Recycle Glass Cullet in Asphalt Shingles to Alleviate Thermal Loads and Reduce Heat Island Effects
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 8
Abstract
As an approach to mitigate the harmful effects of urban heat islands (UHI), the use of glass cullet in the production of asphalt roof shingles has the potential to be employed as a cool roof strategy. The objective of this study was to test the hypothesis that the use of recycled glass cullet increases the solar reflectance index (SRI) without affecting the performance of asphalt roof shingles. In order to evaluate the feasibility of using recycled glass cullet in this new application, the engineering properties of glass cullet were measured and compared to conventional aggregates used in the production of asphalt roof shingles. Laboratory shingle specimens were then prepared in order to measure solar reflectance properties and strength characteristics of conventional and recycled glass roof shingles. Results show that while the use of recycled glass cullet as a replacement to standard ceramic coated black roofing granules on the top surface of asphalt shingles increased the SRI, the addition of white pigment powder (anatase ultrafine titanium dioxide [] particles passing mesh #320) to the surface granules greatly improves the reflectance properties of the roof to a level that meets the cool roof threshold.
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Acknowledgments
The author would like to acknowledge Ghesquiere Plastic Testing, Inc., for providing tear strength testing, Lhoist North America for providing limestone filler material, BlendTec for providing a mixer, Strategic Materials, Inc., for providing glass cullet, 3M Industrial Mineral Products for ceramic coated roofing granules, and the Louisiana Transportation Research Center (LTRC) for granting us access to their laboratories.
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© 2014 American Society of Civil Engineers.
History
Received: May 15, 2014
Accepted: Aug 20, 2014
Published online: Sep 25, 2014
Discussion open until: Feb 25, 2015
Published in print: Aug 1, 2015
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