Rheological and Chemical Properties of Hydrated Lime and Polyphosphoric Acid–Modified Asphalts with Long-Term Aging
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 5
Abstract
The rheological and chemical properties of hydrated lime-polyphosphoric acid (PPA)–modified asphalt binders before and after laboratory oxidative aging were investigated through dynamic shear rheometer (DSR) and nuclear magnetic resonance (NMR) tests. Ten percent by weight of hydrated lime was mixed with 1.5% by weight of PPA-modified asphalt binders. The neat asphalts and multimodified asphalts were subjected to the pressure aging vessel test at a pavement service temperature of 60°C for different durations. The rheological properties of unaged and aged modified asphalts were measured with a DSR at various temperatures. NMR was used to investigate whether hydrated lime reacts with PPA. The rheological results indicate that the addition of hydrated lime to PPA-modified asphalt binders cancels the stiffening effect of PPA. In other words, the addition of PPA to asphalt increases the high-temperature performance grade (PG). The addition of hydrated lime to PPA-modified asphalt removes the benefit of the high-temperature PG that PPA provided. Furthermore, hydrated lime reduces the rate of oxidative age hardening. The interaction between hydrated lime, PPA, and asphalt binders is asphalt-type-dependent. The interaction between sol-type asphalts and hydrated lime and PPA is different from that of gel-type asphalts.
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This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for its contents or use thereof.
The contents of this report reflect the views of Western Research Institute, which is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views of the policy of the U.S. Department of Transportation. Mention of specific brand names of equipment does not imply endorsement by the U.S. Department of Transportation or Western Research Institute.
Acknowledgments
The writers gratefully acknowledge the Federal Highway Administration, U.S. Department of Transportation, for financial support of this project under Contract no. USDOTDTFH61-99C-00022. Thanks are expressed to Dr. Bill Tuminello and Mr. Fred Turner for helpful discussions and manuscript prereview. Thanks are also expressed to Ms. Jackie Greaser for preparation of the manuscript.
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Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 5 • May 2011
Pages: 628 - 637
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Nov 15, 2009
Accepted: Oct 28, 2010
Published online: Oct 30, 2010
Published in print: May 1, 2011
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