Development of Mix Design Procedure for Cold In-Place Recycling with Foamed Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 1
Abstract
The main objective of this study is to determine mix design parameters for cold in-place recycling with foamed asphalt. First, the foaming process of laboratory foaming equipment was validated by varying the water and asphalt content. 1.3% water content was adopted to create the optimum foaming characteristics in terms of the expansion ratio and the half-life at 170°C under air pressure of 400 kPa and water pressure of 500 kPa. The mix design was then performed using both the indirect tensile test and the Marshall test for 13 combinations of foamed asphalt content and water content for three different gradations. The water content did not appear to affect the test results significantly. Maximum stability (both wet and dry samples), maximum bulk density, and indirect tensile strength (both wet and dry samples) were all obtained around 2.5% foamed asphalt content. Overall, the highest Marshall stability and indirect tensile strength were obtained in the order of fine, field, and coarse reclaimed asphalt pavement gradations. It is recommended that the indirect tensile strength based on wet samples be adopted for determining the optimum foamed asphalt content.
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Acknowledgments
The writers would like to thank the Iowa Highway Research Board (IHRB) for financial support and the members of the steering committee for their guidance throughout the project. The opinions, findings, and conclusions expressed in this publication are those of the writers and not necessarily those of the Iowa Department of Transportation.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 18 • Issue 1 • February 2006
Pages: 116 - 124
Copyright
© 2006 ASCE.
History
Received: May 10, 2004
Accepted: May 10, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
Notes
Note. Associate Editor: Eyad Masad
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