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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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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>CHARACTERIZATION METHODOLOGY FOR PREFORMED COMPRESSION SEALS</title>
      <link>https://trid.trb.org/View/576326</link>
      <description><![CDATA[Preformed pavement polychloroprene compression seals were analyzed using dynamic shear rheology and numerical analysis to assess the feasibility of using these techniques to develop an improved methodology for designing and characterizing preformed seals, as well as predicting their field performance.  The investigation consisted of three phases:  (1) dynamic shear rheological analysis of unaged and aged polychloroprene materials to obtain material property input for numerical analysis; (2) numerical analysis of one preformed compression seal web design; and (3) numerical analysis verification through laboratory compression tests of unaged and aged seal materials.  The investigational results indicate advanced material modeling capabilities of finite-element analysis coupled with the material properties obtained through dynamic shear rheological analysis provide a significant capability to explore seal performance variations resulting from different joint seal geometrics, material compositions, and aging characteristics.  The techniques investigated accurately described the deformation of the seal and provided force-displacement relationships, including relaxation with time and stiffening with age.  Additional minor refinements in the techniques developed through this investigation would result in a powerful design and field performance predictive model.]]></description>
      <pubDate>Wed, 06 Aug 1997 00:00:00 GMT</pubDate>
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      <title>RECYCLING AGENTS FOR RECYCLED BITUMINOUS BINDERS</title>
      <link>https://trid.trb.org/View/175517</link>
      <description><![CDATA[Salvaged asphalt treated pavement materials were obtained, analyzed and combined with recycling agents.  Laboratory tests were performed on the field aged mixtures, field aged asphalts, recycling agents, aged asphalt-recycling agent blends and recycled mixtures.  Results from these tests suggest that recycling agents can restore aged asphalts to desired consistency levels and can be used to produce recycled mixtures with acceptable properties. However, the type of recycling agent and the nature of the aged asphalts will determine the temperature susceptibility of the blended binder.  Potential aged asphalt-recycling agent compatibility problems exist.  Tests and/or criterion need to be developed to more accurately recognize this potential problem.  In the interim a laboratory oven aging test conducted on the blend of the aged asphalt and recycling agent is suggested for use. Recycled mixture properties can be adjusted by controlling the amount of recycling agent added.  The properties of recycled mixtures are dependent upon the method and temperature of sample preparation as the blending of the recycling agent with the aged asphalt is both time and temperature dependent.  Pavement performance has been predicted from existing pavement design methods using recycled mixture characterization data.  A recommended specification for recycling agents and a method for the design of recycled mixtures is contained in the report. (FHWA)]]></description>
      <pubDate>Wed, 30 Jun 1982 00:00:00 GMT</pubDate>
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