United States Department of Transportation
i
Simulation, Imaging, and Mechanics of Asphalt Pavement (SIMAP) Initiative
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1998-07-01
[PDF-252.39 KB]
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Abstract:Asphalt concrete is a complex material that consists of aggregates, asphalt, and air voids. Aggregates are held together by asphalt and form a skeleton to support the weight of vehicles. The stiffer the asphalt, the tighter the aggregates are held together and the heavier the load a pavement is able to handle. Certain aggregate structures have stronger skeletons than others and thus can support heavier loads. In an effort to build more durable pavements, state highway agencies use different mix-design procedures to find the strongest aggregate skeletons. Current mix procedures are empirical and are based on trial-and-error methods. They are time-consuming and may sometimes lead to costly pavement failures. The Asphalt Team at the Turner-Fairbank Highway Research Center (TFHRC) is currently working to develop the scientific basis underlying the mix-design process and to establish criteria to predict pavement performance. These efforts involve the simulation, imaging, and mechanics of asphalt pavement (SIMAP).
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