Sensitivity of Untreated Reclaimed Asphalt Pavement to Moisture, Density, and Freeze Thaw
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 12
Abstract
The objective of the research was to assess the structural capacity of reclaimed asphalt pavement (RAP) as a base layer and to investigate the effect of RAP content, moisture content (MC), freeze-thaw (F-T) conditioning, and dry density (DD) on the resilient modulus of untreated RAP as a base layer. The resilient modulus test was conducted in the laboratory for specimens containing different ratios of RAP and aggregate. All samples containing RAP had higher resilient modulus and lower permanent deformation compared to virgin aggregate. Resilient modulus of RAP decreased as the MC increased. At low MCs there was no clear effect of MC on permanent deformation. However, as moisture increased to the wet side of the optimum MC curve, loss of stability was clear. F-T conditioning did not have a negative impact on the stiffness of RAP; this was explained by the low ability of RAP/aggregate blends to hold moisture. DD effect on the resilient modulus was dependent on the level of MC, but developed models showed that increasing DD would increase at the same degree of saturation.
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Acknowledgments
The writers would like to acknowledge the Mn/DOT for its partial support of this research. The writers would like to acknowledge the MnROAD for providing material for this research. This material is based on the work supported by the National Science Foundation under Grant No. NSF0846861. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writer(s) and do not necessarily reflect the views of the National Science Foundation.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 12 • December 2010
Pages: 1260 - 1269
Copyright
© 2010 ASCE.
History
Received: May 16, 2009
Accepted: May 9, 2010
Published online: Jun 12, 2010
Published in print: Dec 2010
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