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April 2008 Vol. 3 No. 1 |
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Yellowstone Greens Up with WMA
Not notable about the Yellowstone National Park seven-mile east entrance construction project last August were the daily visits by bison, bear and moose. For the HK Construction Company of Idaho Falls, Idaho, these were business as usual. What was notable was the absence of smoke and fumes during much of the road construction activity. Click to continue. |
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Hot-mix asphalt |
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Warm-mix asphalt―Where’s the smoke? |
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45th Petersen Asphalt Research Conference and Pavement Performance Prediction Symposium in Laramie July 14-18, 2008 |
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Research Round-up
WRI Looks at RAP–Binder Compatibility
Since RAP, recycled asphalt pavement, is aggregate coated with aged binder, its interaction with new binder produces binder properties―and possibly PG grades―that are different from those of either the old or new asphalt materials selected for a pavement construction project. A new National Cooperative Highway Research Program (NCHRP 9-43, “Mix Designs for Warm Mix Asphalt Technologies” ) conducted by Advanced Asphalt Technologies includes a study by WRI that could have far-reaching application, as it provides a foundation for identifying RAP and new binder blending compatibility. Click to continue. |
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A WMA thin-film coating spin cast onto an aged, RAP-representative asphalt with atomic force microscopy scans showing interfacial characteristics. Please click here for a fuller description. |
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Copyright © 2008 Western Research Institute. All rights reserved. |
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Welcome to Transportation Technology e-Transfer, an electronic publication of Western Research Institute.
TT e-Transfer is produced by the WRI Transportation Technology Business Unit and the Office of Corporate Communications.
Western Research Institute Laramie, Wyoming 82072 (307) 721-2011 1-888-463-6974
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Reaching Beyond Borders― A Perspective on FHWA International Collaboration By Cheryl Allen Richter, P.E., Ph.D.
To meet national transportation goals, FHWA and states continue to rely on a network of collaborations and partnerships with agencies, private industry, academia, and the international transportation community. The benefits from international partnerships include increased knowledge and savings in cost, research, and time.
Matthew Corrigan of the FHWA Office of Pavement Technology and Mostafa “Moe” Jamshidi, Materials and Research Engineer, Nebraska Depart-ment of Roads, inspect a Low Energy Asphalt (LEA) project on the outskirts of Paris as part of the 2007 European Warm Mix Asphalt Scan Tour. |
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Remote Sensing to Improve Maintenance Timing―ASAP
Surface treatments seal cracks and can make pavement surfaces more flexible and resistant to further cracking. One of the problems in asphalt pavement maintenance, however, is determining when to apply surface treatment. The goal of a new WRI remote sensing effort is to make it possible to time application before significant surface cracking develops, yet avoid excessive treatments―exactly what is needed to prolong highway life. Click to continue. |
