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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>COLORADO SWELLING SOILS STUDY</title>
      <link>https://trid.trb.org/View/119341</link>
      <description><![CDATA[EFFECTIVENESS OF SWELL PREVENTATIVE METHODS ON SEVERAL FORMERLY CONSTRUCTED COLORADO HIGHWAYS WAS EVALUATED. THE EVALUATION WAS PERFORMED BY OBTAINING A PRESENT SERVICEABILITY INDEX /PSI/, CORRECTED FOR CRACKING, USING THE BPR ROUGHOMETER AND THE CHLOE PROFILOMETER. PSI VALUES FOR TEST SECTIONS WERE COMPARED TO VALUES FOR ADJACENT CONTROL SECTIONS. SEVERAL CONCLUSIONS WERE REACHED REGARDING THE EFFECTIVENESS OF REMOVAL AND BACKFILLING, AND REMOVAL AND RECOMPACTION METHODS OF SWELL PREVENTION. A GENERAL RECOMMENDATION WAS MADE, CALLING FOR 4 FEET OF ADDITIONAL GRANULAR BACKFILL TO BE PLACED UNDER PAVEMENTS UNDERLAIN BY POTENTIALLY SWELLING SOILS. /BPR/]]></description>
      <pubDate>Sun, 15 Aug 2004 02:18:27 GMT</pubDate>
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      <title>ASPHALT MIX DESIGN AND PERFORMANCE. FINAL REPORT</title>
      <link>https://trid.trb.org/View/423065</link>
      <description><![CDATA[Premature flexible pavement distress became a major concern in Indiana.  As a result, a study was conducted investigating the major underlying factors.  Pavement sections were investigated based on a factorial study with four factors comprised of climate, truck traffic, pavement base type, and wheel path.  The distresses evaluated were rutting, thermal cracking and stripping.  All were evaluated against control sections with zero distress.  The pavement condition of each section was determined.  Laboratory tests of field samples included physical properties, dynamic creep and recompaction.  Results of the study indicate that the Asphalt Institute mix design criteria identify an asphalt content that is too high.  Inplace densities were found to be inadequate and a recommendation was made to use higher field compactive effort.  The USAE Gyratory Testing Machine (GTM) was used in laboratory studies to recompact bulk samples of mixtures.  Good agreement was shown between GTM and in situ bulk density and air voids.  Tests confirm that the in situ asphalt content was too high.  Gap graded gradations were found to be prone to rutting.  Benefit is shown in using dynamic modulus to evaluate mixtures.  A statistical analysis method, discriminant analysis, was used to accurately predict mixture field performance using laboratory data.]]></description>
      <pubDate>Fri, 11 Aug 1995 00:00:00 GMT</pubDate>
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      <title>THE RE-COMPACTION OF FLEXIBLE PAVEMENTS UNDER TRAFFIC /IN GERMAN/</title>
      <link>https://trid.trb.org/View/101065</link>
      <description><![CDATA[INVESTIGATIONS SHOWED THAT RE-COMPACTION OF FLEXIBLE PAVEMENTS UNDER TRAFFIC OCCURS WHEN OPTIMUM COMPACTION HAS NOT BEEN OBTAINED DURING PLACEMENT, AND MAY INCREASE THE BULK DENSITY OF THE STRUCTURE BY MORE THAN 3%. THESE PAVEMENTS ARE OFTEN DEFORMED LATER IN THE REGION OF THE VEHICLE TRACKS BY ABOUT 10 MM. GOOD COMPACTION DURING PLACEMENT CAN AVOID THIS TYPE OF DAMAGE. /FG/RRL/]]></description>
      <pubDate>Mon, 26 Oct 1970 00:00:00 GMT</pubDate>
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