Influence on Compaction of Cold Recycled Mixes with Emulsions Using the Superpave Gyratory Compaction
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 11
Abstract
Cold in-place recycling (CIR) has been increasingly applied in many areas of China, but there is no widely accepted method for the mix design of CIR. The compaction of cold recycled mixtures in the field varies significantly in different working conditions. It is therefore necessary to study the compaction characteristics of cold recycled mixtures. In this study, the primary compactibility energy index (PCEI) and secondary compactibility energy index (SCEI) of CIR were defined from the gyration compaction curve to evaluate the effect of compaction temperature, asphalt emulsion content, moisture content, aggregate gradation, and initial cure time. The control variable method was adopted to conduct the CIR compaction tests. The compaction parameters of CIR were obtained and analyzed statistically. The results from this study indicate that the SCEI of cold recycled mixtures is significantly affected by all variables and the regression of is linear relative to the compaction temperature and asphalt emulsion content. The effect of compaction temperature is much more significant than the other factors. Based on the effect of moisture content on PCEI and SCEI, a new method to determine the optimum moisture content of CIR is provided. The effect of initial cure time actually represents the effect of moisture content to some extent.
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Acknowledgments
This research is sponsored by the National Natural Science Foundation of China (No. 51178113), the Scientific Research Foundation of Graduate School of Southeast University, as well as the Fundamental Research Funds for the Central Universities (No. CXZZ13_0113). All the authors of the following references are much appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 11 • November 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 21, 2013
Accepted: Nov 18, 2013
Published online: Nov 20, 2013
Published in print: Nov 1, 2014
Discussion open until: Nov 3, 2014
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