Effects of Curing Time and Reheating on Performance of Warm Stone-Matrix Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 24, Issue 11
Abstract
The effects of curing time and reheating on the short-term performance of stone-matrix asphalt (SMA) mixtures with various warm-mix additives (i.e., Evotherm, Sasobit, and foamed asphalt) was evaluated in laboratory performance tests. The laboratory tests included complex modulus, loaded wheel track, indirect tensile (IDT) strength, and semicircular beam (SCB) fracture. In the tests, plant-produced mixes that were sampled from a field overlay project were compacted in the laboratory with and without reheating, and performance tests were conducted at various curing times after compaction. The effect of curing time on mixture characteristics was dependent on the mixture type and performance test considered. The mixtures containing warm-mix additives showed similar variations in mixture properties due to curing time compared to the control mixture. The reheating process caused asphalt mixtures to have greater modulus, tensile strength, and rutting resistance but smaller fracture resistance. Among the mixtures containing various warm-mix additives, the mixture containing Sasobit showed the relatively smallest changes in mixture properties attributable to reheating. Finally, it was discovered that the warm SMA mixtures showed variations in different performance characteristics, depending on the type of warm-mix additives and recycled materials, than the control mixture.
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Acknowledgments
The authors would like to acknowledge the sponsorship provided by the Illinois State Toll Highway Authority. The help provided by the staff and many students at the Illinois Center for Transportation; the S.T.A.T.E. Testing, LLC; the Applied Research Associates, Inc.; and the K-Five Construction, Geneva Construction, and Rock Road asphalt plants in the Chicago area was greatly appreciated. The contents of this study do not necessarily reflect the official views or policies of the Illinois Center for Transportation, the Illinois State Toll Highway Authority, or the Federal Highway Administration. This paper does not constitute a standard, specification, or regulation.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 24 • Issue 11 • November 2012
Pages: 1422 - 1428
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Oct 23, 2011
Accepted: Mar 7, 2012
Published online: Mar 10, 2012
Published in print: Nov 1, 2012
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