Low Temperature Fracture Properties of Polyphosphoric Acid Modified Asphalt Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 24, Issue 8
Abstract
The low temperature fracture properties of polyphosphoric acid (PPA) modified mixtures are evaluated and compared with those of polymer modified mixtures. The main objective is to determine whether PPA can partially or completely substitute traditional polymer modifiers, without adversely affecting the mixture’s resistance to thermal cracking. Laboratory compacted and field cored test samples from the Minnesota Road Research Project (MnROAD) were tested using traditional methods as well as newly developed fracture testing protocols: indirect tensile test (IDT), semicircular bending test (SCB), and disk-shaped compact tension test (DCT). The effects of temperature, air-void content, comma and long-term aging on low temperature fracture properties were analyzed; and field performance observations of the test cells from MnROAD were discussed. On the basis of the analysis, the fracture resistance of the PPA modified mixture is less than that of the SBS modified mixture. However, when PPA is used to substitute part of the SBS, a mixture with fracture resistance comparable to that of the mixture modified with SBS alone is produced.
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Acknowledgments
This research was sponsored by Federal Highway Administration National Pooled Fund Study TPF-5(132) led by the Minnesota Department of Transportation. This support is gratefully acknowledged. The authors also acknowledge Dr. Eshan Dave for providing DCT test results for all asphalt mixtures. The results and opinions presented are those of the authors and do not necessarily reflect those of the sponsoring agencies.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 24 • Issue 8 • August 2012
Pages: 1089 - 1096
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Mar 31, 2011
Accepted: Jan 24, 2012
Published online: Jan 26, 2012
Published in print: Aug 1, 2012
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