Abstract
The strength reduction associated with the replacement of the virgin coarse aggregate in concrete with recycled asphalt pavement (RAP) limits the use of the RAP concrete to nonstructural applications. Recent research has suggested that RAP concrete might retain sufficient strength for structural applications if high-strength concrete mixture designs were used. Before these high-strength RAP concrete mixtures can be used in transportation infrastructure applications, their durability must be proven. This study evaluated the chloride permeability, the freeze-thaw durability, and the coefficient of thermal expansion of high-strength RAP concrete mixtures. The results indicated that the chloride permeability of the high-strength concrete, as measured by the surface resistivity, was unaffected by the replacement of up to 50% of virgin coarse aggregate with RAP. Furthermore, the freeze-thaw durability of high-strength RAP concrete was improved over high-strength concrete with 100% virgin coarse aggregate. The optimal RAP fraction in terms of the freeze/thaw durability was 35% by mass. Finally, the coefficient of thermal expansion was minimally affected by the replacement of up to 50% of virgin coarse aggregate with RAP. On the basis of these results, the durability of high-strength concrete with RAP coarse aggregate was deemed sufficient for transportation infrastructure applications.
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Acknowledgments
The authors would like to acknowledge the Idaho Transportation Department for providing the research funding to support this study.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 5 • May 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Apr 28, 2017
Accepted: Oct 31, 2017
Published online: Feb 16, 2018
Published in print: May 1, 2018
Discussion open until: Jul 16, 2018
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