Optimization of Fiber Blending and Testing Parameters for Poly-Aramid Blends Optimization of Fiber Blending and Testing Parameters for Poly-Aramid Blends OBJECTIVE The main objective of this study is to evaluate and improve upon laboratory mixing and testing methods for Fiber Reinforced Asphalt Concrete (FRAC) mixtures. The investigation will evaluate factors such as mixing time, mixing temperatures, and mixing type and the interaction of these factors with the type of mixture used. Mechanical characterization and testing recommendations will cover both cracking and rutting distresses. BACKGROUND Several studies have shown the positive effect fibers can have on the engineering properties and performance of asphalt concrete (1-19). The potential for fiber reinforcement to extend the performance and improve the sustainability of asphalt concrete pavements is recognized in Section 503: Research and Technology Development and Deployment of the Moving Ahead for Progress in the 21st Century Act, which states that one strategy for improving infrastructure integrity may involve studies on the effectiveness of fiber-based additives to improve the durability of surface transportation materials in various geographic regions Despite the well documented benefits of FORTA-FI fibers to reinforce asphalt concrete (FRAC) mixtures, its usage in the United States, while increasing, still does not represent a deserving portion of the overall tonnage. One key reason is the lack of a generally applicable laboratory method to introduce the fibers into asphalt concrete mixtures. Agencies seeking to evaluating FRAC often require laboratory verification of the product prior to embarking on a full scale experiments. Two issues arise in these studies; 1) creating representative FRAC samples and 2) testing FRAC samples in a manner that fairly represents their performance in the field. In the laboratory, agencies often encounter unexpected difficulties in preparing FRAC samples. Without careful attention to the mixing process fibers will not distribute in a homogeneous manner leading the agency to have reduced confidence in the ability of the product to distribute in a full-scale mixing plant. Once samples are created, a second hurdle lies in the laboratory evaluation method. Performance tests of varying rigor exist in these agencies laboratories. The most common methods may include flexural beam, the Texas overlay tester, IDT strength (Tensile Strength Ratio test), French rut tester, Hamburg, and others. Two factors contribute to these tests being more or less accurate indicators of field performance; 1) length scale of induced damage and 2) extent to which they measure fundamental materials properties.
|Effective start/end date||9/17/13 → 5/31/16|
- INDUSTRY: Domestic Company: $79,686.00
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