Strain Response of Reclaimed Asphalt Pavement Material Blends under Extended Loading Testing
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 11
Abstract
The use of reclaimed asphalt pavement (RAP) material in new paving projects is increasing in popularity, with research showing that RAP blended with aggregate will increase the resilient modulus of subgrade material. These studies have focused on the effects of RAP on the resilient modulus of the base layer without in-depth observation into the factors affecting permanent deformation. The objective of this research is to examine the early and long-term development of cumulative strain in RAP blends under combinations of moisture content, content of fines, and stress levels. Single stage testing is conducted in the laboratory for sample materials containing aggregate and RAP material. Cumulative strain percentage is the quantity of comparison between materials and testing results. Blends of 50% RAP and 50% Class 5 mixed at optimum moisture content (OMC) yield the lowest strain rates in the early testing stages and the lowest long-term accumulated strain. Blends tested with 10% fines yield comparable results to all OMC blends. Blends with accumulate more strain than Class 5 blends, whereas mixes with high content of fines and are the most susceptible to developing strain. Accumulated strain per cycle has the highest rate in the preliminary stages of testing. Over 90% of the 20,000 cycle accumulated strain occurs at 3,000 to 5,000 cycles for high moisture blends. RAP reduces the effect of strain rate sensitivity and yields a more resilient response capability than Class 5 material.
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Acknowledgments
Research in the paper is based, in part, on testing data collected under MnDOT project MN/RC 2009-05, grant number 88200. The authors would like to acknowledge MnDOT for its partial support of this research. The authors 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. 0846861. 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. The original data was presented in the Ph.D. dissertation work of Dr. M.I.E. Attia. Professor M. Abdelrahman served as the Principal Investigator for the above projects and main advisor for M.I.E. Attia.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 11 • November 2013
Pages: 1674 - 1681
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 20, 2012
Accepted: Nov 21, 2012
Published online: Oct 15, 2013
Published in print: Nov 1, 2013
Discussion open until: Mar 15, 2014
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