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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Assessment of Aging at FHWA’s Pavement Testing Facility</title>
      <link>https://trid.trb.org/View/781421</link>
      <description><![CDATA[Field cores were taken in 1995 and 2002 from eight asphalt pavements constructed in 1993 at FHWA’s pavement testing facility to evaluate in situ pavement aging. Dynamic mechanical properties of these cores were evaluated by using the Superpave® shear tester. The moduli of aged pavements were also predicted from binder, aggregate, and mixture properties with available prediction models, and the aging severity levels of all pavements were compared between the lab-measured and model-predicted. Eight pavements with two polymer-modified and six unmodified binders were evaluated in this study. Polymer-modified asphalt pavements showed comparatively lower aging than unmodified asphalt pavements. For unmodified asphalt pavements, stiffer asphalts tended to have higher aging indices. The binder aging index was found to be inversely proportional to the loading frequency, and differences between the aging indices for different binders were higher at lower frequency. Comparison of lab-measured and model-predicted binder aging indices showed similar rankings for all binders. Low stiffness binders, for example, AC-5, showed higher aging indices than high stiffness binders, for example, Styrelf. Pavement depth significantly affected binder aging. The aging index near the surface (6.35 mm) was found to be about four to five times the aging index at a depth of 139.7 mm in pavement. Comparison of lab-measured and model-predicted mixture aging indices showed large variations, from overpredicted to quite underpredicted, depending on the binder type and nominal maximum aggregate size.]]></description>
      <pubDate>Mon, 08 May 2006 16:02:25 GMT</pubDate>
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      <title>Pavement Management; Monitoring, Evaluation, and Data Storage; and Accelerated Testing 2005</title>
      <link>https://trid.trb.org/View/781369</link>
      <description><![CDATA[This Transportation Research Record contains 16 papers organized in the following three parts:  (1) pavement management; (2) pavement monitoring, evaluation, and data storage; and (3) accelerated pavement testing.  Specific topics addressed in part 1 include thin hot mix asphalt concrete overlays, incorporating variability into pavement performance, monitoring pavement performance with pavement management system data, a pavement management system based on financial consequence, predicting pavement crack initiation, and ride quality standards from the customer perspective.  Part 2 papers examine automated versus manual pavement condition surveys, an ultrasonic technique for evaluating top-down cracks in asphalt pavements, accuracy of ground penetrating radar for estimating pavement layer thicknesses, pavement diagnostics with wavelet-based multiresolution analysis, wavelet-based pavement distress classification, and the development of a crack type index.  Part 3 papers discuss accelerated pavement testing of full-scale concrete slabs, quantifying pavement damage by dual and wide-base tires, rut initiation mechanisms in asphalt mixtures from accelerated pavement testing, and assessment of aging at FHWA's pavement testing facility.]]></description>
      <pubDate>Mon, 08 May 2006 16:02:06 GMT</pubDate>
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