Validation of New Mix Design Procedure for Cold In-Place Recycling with Foamed Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 11
Abstract
The main objective of this study is to validate a new mix design procedure for cold in-place recycling using foamed asphalt (CIR-foam) developed for the Iowa Department of Transportation. First, reclaimed asphalt pavement (RAP) materials were collected from seven different CIR construction sites located across the state of Iowa. To determine the consistency of a new CIR-foam mix design procedure, the mix design was performed seven times using these RAP materials. The test specimens were prepared using gyratory compactor rather than Marshall hammer because it produced more consistent mixtures for various foamed asphalt contents and curing conditions. The indirect tensile strength test was performed on the vacuum-saturated specimens prepared using each of seven RAP material sources for five different foamed asphalt contents (1.0, 1.5, 2.0, 2.5, and 3.0%), given a fixed moisture content of 4.0%. As the foamed asphalt content increased from 1.0 to 3.0% at 0.5% increments, air voids in the CIR-foam mixtures decreased gradually. The indirect tensile strength of CIR-foam specimens cured for two days at was significantly higher than that of CIR-foam specimens cured for three days at . Based on the new mix design procedure, the optimum foamed asphalt contents were consistently found at values between and for all seven different RAP materials. The stiffer residual asphalt required more foamed asphalt, whereas the higher residual asphalt content did not require a smaller amount of foamed asphalt. The raveling test result was very sensitive to the curing time and the foamed asphalt content, such that RAP materials with a large amount of stiff residual asphalt would exhibit more potential for raveling.
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Acknowledgments
The writers would like to thank the Iowa Highway Research Board (IHRB) for its financial support, and the members of the steering committee for their guidance throughout the project. The opinions, findings, and conclusions are those of the author, and not necessarily those of the Iowa Department of Transportation.
References
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© 2007 ASCE.
History
Received: May 25, 2006
Accepted: Oct 16, 2006
Published online: Nov 1, 2007
Published in print: Nov 2007
Notes
Note. Associate Editor: Baoshan Huang
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