Impacts of Curing Time and Moisture Content on Engineering Properties of Cold In-Place Recycling Mixtures Using Foamed or Emulsified Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 5
Abstract
A cold in-place recycling (CIR) layer is typically overlaid by hot-mix asphalt (HMA) to protect it from water ingress and traffic load. Most public agencies have different curing requirements that specify the number of curing days or the maximum moisture content for the CIR layer before placing the HMA overlay. However, these criteria are not well-founded on sound engineering principles and are often challenged by contractors, especially in inclement weather conditions. This study was performed to explore technically sound ways to identify the minimum in-place CIR properties necessary to permit the placement of an HMA overlay. The primary objective of this research was to determine how curing time and moisture content affect the development of indirect tensile strength, dynamic modulus, and flow number of CIR mixtures composed of foamed asphalt (CIR-foam) or emulsified asphalt (CIR-emulsion). On the basis of the limited test results, the indirect tensile strength of CIR specimens did not increase during an early stage of curing but increased during a later stage of curing, usually when the moisture content was less than 1.5%. Given the same curing time, CIR-foam specimens exhibited more tensile strength and less moisture content than CIR-emulsion specimens. Both dynamic modulus and flow numbers increased as the curing time increased and the moisture content decreased. Given the same moisture content, CIR-foam specimens exhibited higher dynamic modulus and larger flow numbers than CIR-emulsion specimens.
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Acknowledgments
The writers would like to thank the financial support provided by the Iowa Highway Research Board (IHRB) and the members of the steering committee for their guidance throughout the project.
The contents of this paper reflect the views of the writers, who are responsible for the facts and the accuracy of the information presented. The opinions, findings, and conclusions expressed in this publication are those of the writers and not necessarily those of the sponsors. The sponsors assume no liability for the contents or use of the information contained in this document.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 5 • May 2011
Pages: 542 - 553
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Sep 30, 2009
Accepted: Oct 13, 2010
Published online: Oct 26, 2010
Published in print: May 1, 2011
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