Accelerated Testing of Warm Mix Asphalt for Safe and Reliable Freight Transportation
This report presents a new organic warm mix asphalt (WMA) product that has been recently introduced to the U.S. market, which is Polyethylene (PE) Wax-based WMA additive with crystal controller to increase the low temperature cracking resistance and anti-stripping agent to enhance moisture susceptibility. The new PE Wax-based WMA mixtures with recycled asphalt pavement (RAP) materials were also tested using the Hamburg Wheel Tracking (HWT) device and the wheel passes were significantly higher with WMA mixtures with PG 64-28 binder, Minnesota aggregates and 25% RAP than the ones with 64-22 binder, Iowa aggregates and 10% RAP. The HWT test results seemed to be influenced by more on the characteristics of aggregates and RAP materials than the WMA additive. In-service roads in Iowa and Minnesota were successfully rehabilitated using the PE Wax-based WMA mixtures. The average void of 1.5-inch WMA overlay (9.0%) was higher than that of hot mix asphalt (HMA) overlay (7.0%) placed on an urban street in Iowa City. It was partly due to the asphalt temperature that was lowered to match the lower aggregate temperature. As a result, the aggregate temperature for WMA was also significantly lower than HMA. It is interesting to note, however, that the average air void of the cores obtained from the rehabilitation section of the same street using LEADCAP was 6.0%. On Minnesota’s state highway, the average air voids of four WMA and HMA cores for quality control were 5.85% and 5.29%, respectively, and those of four other WMA and HMA cores for quality assurance were 6.05% and 6.01%, respectively. The WMA pavements were easier to reach 94% density with fewer passes of a compactor than HMA. The LEADCAP WMA test section was constructed at the Accelerated Pavement Load Facility (APLF) at Ohio University. The maximum rut measurement was 0.30 and 0.34 inch under each of the loading duel tires. The most significant amount of rut developed after 5,000 repetitions.
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Supplemental Notes:
- This research was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
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Corporate Authors:
University of Iowa, Iowa City
Public Policy Center
Department of Civil and Environmental Engineering
Iowa City, IA United States 52242-1192Mid-America Transportation Center
University of Nebraska-Lincoln
2200 Vine Street, PO Box 830851
Lincoln, NE United States 68583-0851Research and Innovative Technology Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Lee, Hosin
- Glueckert, Thomas
- Ahmed, Taha
- Publication Date: 2012-7
Language
- English
Media Info
- Media Type: Digital/other
- Edition: Final Report
- Features: Figures; Photos; References; Tables;
- Pagination: 41p
Subject/Index Terms
- TRT Terms: Accelerated tests; Aggregates; Air voids; Antistrip additives; Bituminous overlays; Ethylene resins; Reclaimed asphalt pavements; Recycled materials; Rehabilitation; Rutting; Warm mix paving mixtures; Waxes
- Identifier Terms: Hamburg Wheel Tracking Device
- Geographic Terms: Iowa; Minnesota
- Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;
Filing Info
- Accession Number: 01482569
- Record Type: Publication
- Report/Paper Numbers: 25-1121-0001-451
- Files: UTC, TRIS, RITA, ATRI, USDOT
- Created Date: May 29 2013 10:55AM