Porous Asphalt Mixture with a Combination of Solid Waste Aggregates
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 6
Abstract
The strategy of blending a low-utility waste stream (glass) into a well-recyclable stream [recycled concrete aggregate (RCA)] was applied that entailed evaluating porous asphalt mixture (PAM) made of RCA and glass. Two hybrid PAM designs containing 78% RCA, together with 16% glass particles as smallest-sized or as medium-sized aggregate component, were evaluated against two control groups comprising full-granite and full-RCA aggregates, respectively. An experiment designed to assess the bonding effect between asphalt and aggregates showed that glass particles possessed the weakest bonding effect with asphalt as compared with granite and RCA. Optimal asphalt content (OAC) was determined based on Cantabro test, draindown test, and Marshall test. For the two hybrid PAMs, mixture containing fine glass was more resistant against abrasion but weaker in dynamic creep test than the mixture containing medium-sized glass. On the whole, PAM material made with waste materials can meet the relevant requirements in performance tests and are considered suitable for direct applications in low-strength pavements such as pedestrian and cyclist pathways.
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Acknowledgments
The authors would like to thank Shell Bitumen Singapore, Samwoh Co. Ltd., and Singapore Safety Glass Pte. Ltd. for supplying bitumen (PEN 60/70), RCA, and waste glass, respectively. The authors also thank the graduating bachelor degree students in characterizing some of the material properties.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 6 • June 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jan 28, 2014
Accepted: Apr 28, 2014
Published online: Aug 18, 2014
Discussion open until: Jan 18, 2015
Published in print: Jun 1, 2015
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