Asphalt Technology News
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The National Center for Asphalt Technology (NCAT) has undertaken a wide range of hot mix asphalt (HMA) related research projects. These projects have been funded by various agencies such as the National Cooperative Highway Research Program (NCHRP) of the Transportation Research Board, the Federal Highway Administration (FHWA), the Alabama Department of Transportation, the South Carolina Department of Transportation, and the National Asphalt Pavement Association Research and Education Foundation. Most of these research projects are of national interest and will help advance HMA technology. A discussion of some selected research projects and other NCAT activities follows. Design and Evaluation of Stone Matrix Asphalt (SMA) Mixes. This NCHRP project was undertaken to develop a rational mix design and evaluation procedure for SMA. Phase I, which consisted of a recommended mix design procedure for SMA using Marshall equipment, has been completed. Phase II, which is under way, will recommend specific tests and criteria for the mortar fraction of the SMA mixture as well as for the total SMA mixture. On completion of this project, a revised Marshall mix design procedure and a Superpave mix design procedure will be recommended for SMA mixtures.
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Asphalt Technology News
The National Center for Asphalt Technology (NCAT) completed a roundrobin study in March to determine the accuracy and precision of the NCAT asphalt content tester. The Center has conducted research since 1990 to develop this test method for determining asphalt content of hot mix asphalt (HMA) mixtures by ignition (See the fall, 1994, issue of Asphalt Technology News). In the ignition method, a ...
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The Alabama Department of Transportation and the National Center for Asphalt Technology (NCAT) are planning to construct and operate an oval test track (accelerated pavement loading facility) to evaluate the performance of various hot mix asphalt (HMA) test pavements. Auburn University has purchased 310 acres of land approximately 15 minutes from the university for the test track. Construction ...
متن کاملA Review of Aggregate and Asphalt Mixture Specific Gravity Measurements and Their Impacts on Asphalt Mix Design Properties and Mix Acceptance
The Asphalt Pavement Technology Program is an integrated, national effort to improve the long‐term performance and cost effectiveness of asphalt pavements. Managed by the Federal Highway Administration through partnerships with State highway agencies, Industry and academia the program’s primary goals are to reduce congestion, improve safety, and foster technology innovation. The program was est...
متن کاملEvaluating the Performance of Hot Mix Asphalt with Reclaimed Asphalt Pavement and Heavy Vacuum Slops as Rejuvenator
Due to the high price of crude oil, and consequently asphalt binder, the application of Reclaimed Asphalt Pavement (RAP) in pavement technology is widely considered. The present paper is the result of a laboratory research which was carried out to investigate the effects of adding a rejuvenating agent to Hot Mix Asphalt (HMA) with RAP. To this end, test samples comprised of Aged Asphalt Binder ...
متن کاملThe Effect of Carbon Nano-tube on the Fatigue Life of Asphalt Mixtures
The fatigue cracks are observed in asphalt surfaces much more than ruts. This paper deals with the influence of carbon nano-tube on the fatigue life of asphalt mixtures. These samples are made up of the slabs cut by the asphalt cutting saw. Fatigue beams contain 0, 0.3, 0.6, 0.9, 1.2, and 1.5 percent of Carbon Nano-tube. The fatigue experiment was conducted using a 4-point semi-sinusoidal loadi...
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