Evaluation of Cold In-Place and Cold Central-Plant Recycling Methods Using Laboratory Testing of Field-Cored Specimens
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 11
Abstract
During the 2011 construction season, the Virginia Department of Transportation (VDOT) completed a major pavement recycling project that marked the first time full-depth reclamation (FDR), cold in-place recycling (CIR), and cold central-plant recycling (CCPR) were used together on a single project on the US interstate system. The CIR and CCPR mixtures were produced by using foamed asphalt and hydraulic cement as the stabilizing agents. After completing the pavement rehabilitation project, engineering properties of the CIR and CCPR mixtures were determined in the laboratory from field-cored specimens. VDOT conducted this study because the agency was considering using a single set of construction specifications for both CIR and CCPR materials if the engineering properties of the two processes were found to be similar. This project offered a unique opportunity to evaluate the two recycling methods by using materials from the same location. Laboratory tests included gradation, binder content, density measurements, indirect tensile strength (ITS) measurements, and resilient modulus () testing. ITS and were selected because ITS has traditionally been used for the design and acceptance of recycled mixtures, whereas testing offers a step toward mechanistic pavement design in its use in Mechanistic Empirical Pavement Design Guide/DARWin-ME software. The results demonstrated that differences in the engineering properties of the recycled materials, as produced by CIR and CCPR, are not statistically significant. Previously, information was limited in the literature to support designs using pavement recycling, or using CCPR in particular, as another option for highway agencies seeking to use a more environmentally friendly option to rehabilitate pavements. The results presented in this study will also help pavement engineers to better recognize the range of material properties possible with recycled mixtures.
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Acknowledgments
The authors acknowledge the assistance of the following Virginia Center for Transportation Innovation and Research (VCTIR) personnel: Donnie Dodds, Troy Deeds, and Benjamin Earl for material testing; and Ann Overton for the editorial process. The assistance provided by Michael Brown, Associate Director at VCTIR is very much appreciated. The assistance provided by Richard Ferron, Lanford Brothers Co.; Mike Marshall, Wirtgen America; Rennie Shunmugam, Loudon International; and Chaz Weaver, VDOT Staunton District Materials Engineer; is very much appreciated.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 11 • November 2013
Pages: 1712 - 1720
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 18, 2012
Accepted: Oct 11, 2012
Published online: Oct 13, 2012
Discussion open until: Mar 13, 2013
Published in print: Nov 1, 2013
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