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    <title>Transport Research International Documentation (TRID)</title>
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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>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>General Discussion</title>
      <link>https://trid.trb.org/View/1287004</link>
      <description><![CDATA[No abstract]]></description>
      <pubDate>Mon, 27 Jan 2014 10:37:34 GMT</pubDate>
      <guid>https://trid.trb.org/View/1287004</guid>
    </item>
    <item>
      <title>Symposium on mineral fillers for bituminous mixtures</title>
      <link>https://trid.trb.org/View/1178507</link>
      <description><![CDATA[]]></description>
      <pubDate>Fri, 24 Aug 2012 01:50:53 GMT</pubDate>
      <guid>https://trid.trb.org/View/1178507</guid>
    </item>
    <item>
      <title>FUNCTIONS OF FILLERS IN BITUMINOUS MIXES</title>
      <link>https://trid.trb.org/View/100938</link>
      <description><![CDATA[A FILLER DEFINED AS THAT FRACTION OF AN INERT MINERAL DUST PASSING THE 200-MESH SIEVE IN A BITUMINOUS MIXTURE CAN PERFORM SEVERAL FUNCTIONS. ONE FUNCTION IS THAT OF FILLING VOIDS IN COARSER AGGREGATES, WHICH INCREASES THE DENSITY, STABILITY, AND TOUGHNESS OF A CONVENTIONAL BITUMINOUS PAVING MIXTURE. ANOTHER, IS THE CREATION OF A FILLER-ASPHALT MASTIC IN WHICH THE PARTICLES OF DUST EITHER MAY BE INDIVIDUALLY COATED WITH ASPHALT OR ARE INCORPORATED INTO THE ASPHALT IN MECHANICAL AND COLLOIDAL SUSPENSION. THESE FORMS OF MASTIC ARE PRODUCED BY SPECIAL PROCESSES, SUCH AS COOKING, ATOMIZED ASPHALT, AND FOAMED ASPHALT. IN PAVING MIXTURES THE MASTIC SERVES AS THE CEMENTING AGENT. THE EFFECT OF FILLERS IN CONVENTIONAL-TYPE MIXES IS PRONOUNCED. EXCESS QUANTITY OF FILLER TENDS TO INCREASE STABILITY, BRITTLENESS, AND PROCLIVITY TO CRACKING. DEFICIENCY OF FILLER TENDS TO INCREASE VOID CONTENT, LOWER STABILITY, AND SOFTEN THE MIX. IN MASTIC MIXES THE QUANTITY OF FILLER USED IS NOT CRITICAL. WHEN FILLER PARTICLES ARE INDIVIDUALLY COATED WITH THIN FILMS OF ASPHALT, STRONG, STABLE, TOUGH MIXES MAY BE PREPARED COMPOSED OF 100 PERCENT FILLER WITH 20 TO 25 PERCENT OF ASPHALT. IN MIXES WHEREIN THE FILLER IS IN SUSPENSION IN THE ASPHALT (SUCH AS THE HOT LIQUID ASPHALT MASTIC MIXES, GUSSASPHALT, ROOFING, AND WATERPROOFING COMPOUNDS) THE FILLER-ASPHALT MASTIC IS THE CEMENTING AGENT. THE PROPERTIES OF THE FILLER-ASPHALT MASTIC ARE INFLUENCED BY THE QUANTITY OF FILLER IN SUSPENSION. AN ASPHALT CEMENT OF 200 PLUS PENETRATION CONTAINING 30 TO 40 PERCENT OF FILLER WILL FORM A CEMENTING AGENT OR BINDER HAVING A PENETRATION OF ABOUT 10. HOWEVER, THE ASPHALT CEMENT ITSELF STILL RETAINS ITS ORIGINAL PENETRATION. THIS PHENOMENON HAS BEEN OBSERVED IN RELATION WITH NATURAL ASPHALTS (SUCH AS TRINIDAD), WHICH CONTAIN MINERAL DUSTS IN SUSPENSION. THE USE OF SUCH MASTICS IN PAVING MIXTURES PERMITS USE OF HIGHER DUST QUANTITIES AND HIGHER MIXING TEMPERATURES, YIELDING TOUGHER DENSER MIXES. SPECIAL MIXING PROCESSES (SUCH AS COOKING, ATOMIZED ASPHALT, OR FOAMED ASPHALT) ARE REQUIRED TO PRODUCE SUCH MIXES. /AUTHOR/]]></description>
      <pubDate>Fri, 19 Aug 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/100938</guid>
    </item>
    <item>
      <title>MINERAL FILLERS IN ASPHALT PAVING MIXTURES</title>
      <link>https://trid.trb.org/View/100943</link>
      <description><![CDATA[A CONTINUATION IS DESCRIBED OF INVESTIGATIONS ON EFFECTS OF VARIOUS MINERAL FILLERS ON PROPERTIES OF ASPHALT PAVING MIXTURES. PREVIOUS STUDIES INDICATED THAT INTRODUCTION OF VARYING AMOUNTS AND TYPES OF MINERAL FILLERS INTO A PAVING MIXTURE MAY GREATLY INFLUENCE COMPACTION CHARACTERISTICS AND, THEREFORE, RESULTANT VOLUMETRIC PROPORTIONS AND TEST PROPERTIES OF MIXTURES COMPACTED WITH A CONSTANT COMPACTIVE EFFORT. MECHANICAL GYRATORY COMPACTION PROCEDURES USING VARIABLE COMPACTIVE EFFORTS WERE DEVELOPED TO COMPACT LABORATORY TEST SPECIMENS CONTAINING CONSTANT VOLUME PROPORTIONS OF MINERAL AGGREGATES AND AIR REGARDLESS OF TYPES AND AMOUNTS OF MINERAL FILLERS AND ASPHALT USED. THE PROCEDURES PERMITTED AN EVALUATION OF THE EFFECTS OF MINERAL FILLERS AND ASPHALT ON COMPACTION CHARACTERISTICS OF THE PAVING MIXTURES. THE RELATIVE EFFECTS OF MINERAL FILLER AND ASPHALT ON PROPERTIES OF PAVING MIXTURES CONTAINING CONSTANT VOLUME PROPORTIONS OF MIXTURE COMPONENTS WERE THEN DETERMINED. BOTH SAND ASPHALT AND ASPHALT CONCRETE PAVING MIXTURES WERE STUDIED. MIXTURES WERE PREPARED WITH NO ADDED MINERAL FILLER, AND WITH VARYING AMOUNTS OF LIMESTONE DUST, HYDRATED LIME, KAOLIN CLAY, ASBESTOS, AND FULLER'S EARTH. VARYING AMOUNTS OF DIFFERENT VISCOSITY ASPHALTS WERE USED IN THE MIXTURES. TEST RESULTS PRESENTED AND DISCUSSED INDICATE PRONOUNCED AND VARYING EFFECTS WHICH MINERAL FILLERS AND ASPHALTS HAVE ON PAVING MIXTURE PROPERTIES. /AUTHOR/]]></description>
      <pubDate>Fri, 05 Aug 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/100943</guid>
    </item>
    <item>
      <title>EFFECT OF FILLERS ON THE MARSHALL STABILITY OF BITUMINOUS MIXTURES</title>
      <link>https://trid.trb.org/View/100945</link>
      <description><![CDATA[THE RESULTS ARE PRESENTED OF EXPERIMENTS WHICH SHOW THE LARGE EFFECT OF FILLER QUANTITY AND FILLER TYPE ON THE MARSHALL STABILITY OF BITUMINOUS CONCRETE. THE MATHEMATICAL RELATIONSHIP OF FILLER (QUANTITY TIMES TYPE) TO THE STABILITY OF AN ASPHALTIC CONCRETE MIXTURE USING SAND-GRAVEL AGGREGATE IS SHOWN, AND A SIMPLE TEST IS DESCRIBED BY WHICH THE QUATITATIVE EFFECT OF VARIOUS TYPES OF FILLERS ON STABILITY MAY BE DETERMINED. /AUTHOR/]]></description>
      <pubDate>Fri, 05 Aug 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/100945</guid>
    </item>
    <item>
      <title>APPLICATION OF INFRARED SPECTROSCOPY TO BITUMINOUS MINERAL FILLER EVALUATION</title>
      <link>https://trid.trb.org/View/100946</link>
      <description><![CDATA[A DESCRIPTION IS GIVEN OF THE METHODS USED AND RESULTS OBTAINED IN EVALUATING A SPECIFIC NATURAL MINERAL DEPOSIT AS A POSSIBLE MINERAL FILLER FOR BITUMINOUS PAVEMENT MIXTURES. BY RESORTING TO A COMBINATION OF INSTRUMENTAL METHODS, PHYSICAL TESTS, AND CHEMICAL ANALYSIS, THE CLAY MINERAL NATURE OF THE MATERIAL AND ITS POTENTIAL BEHAVIOR AS A MINERAL FILLER WERE DETERMINED. THE METHODS USED INCLUDED INFRARED SPECTROSCOPY, X-RAY DIFFRACTION, DIFFERENTIAL THERMAL ANALYSIS, FINENESS, SURFACE AREA, AND PLASTICITY TESTS, CHEMICAL ANALYSIS, IMMERSION-COMPRESSION TESTS OF BITUMINOUS CONCRETE MIXTURES, AND SOFTENING POINT TESTS OF ASPHALT-FILLER MORTARS. THE REPORT EMPHASIZES THE MERITS OF COMBINING AVAILABLE TOOLS IN SUCH AN EVALUATION AND PARTICULARLY DESCRIBES THE USE OF INFRARED SPECTROSCOPY IN THIS CONNECTION. /AUTHOR/]]></description>
      <pubDate>Fri, 05 Aug 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/100946</guid>
    </item>
    <item>
      <title>EVALUATION OF MICROAGGREGATES BY SMITH TRIAXIAL TEST</title>
      <link>https://trid.trb.org/View/100947</link>
      <description><![CDATA[BITUMINOUS CONCRETE MIXES USUALLY CONSIST OF BINDER, COARSE AGGREGATE, FINE AGGREGATE, AND MINERAL FILLER. BECAUSE THE FUNCTION OF THE FILLER IS NOT JUST TO FILL THE VOIDS, BUT TO A GREAT EXTENT ALSO DICTATE THE PHYSICAL AND OTHER CHARACTERISTICS OF THE MIX, A MORE DESCRIPTIVE AND PRECISE NAME FOR A FILLER IS MICROAGGREGATE. THE STUDY INCLUDED FIVE MICROAGGREGATES: LIMESTONE, HYDRATED LIME, HYDRITE (CLAY), ASBESTOS, AND QUARTZ. THE QUARTZ MICROAGGREGATE WAS FURTHER TESTED USING THREE DIFFERENT GRADATIONS. ALL MICROAGGREGATES WERE INCORPORATED IN A STANDARD MASSACHUSETTS DENSE-GRADED BITUMINOUS CONCRETE MIX. THE COARSE AGGREGATE RHYOLITE AND THE FINE AGGREGATE (SAND) WERE KEPT CONSTANT IN ALL EXPERIMENTS. VARIOUS ASPHALT CONTENTS WERE USED. THE SMITH TRIAXIAL CELL WAS ADOPTED IN THE STRENGTH EVALUATION OF ALL MIXES. THE SPECIMENS WERE COMPACTED IN LAYERS USING A KNEADING COMPACTOR TO SIMULATE ULTIMATE DENSIFICATION UNDER TRAFFIC. ALL MIXES EXCEPT THOSE CONTAINING ASBESTOS HAD RELATIVELY LOW VOID CONTENTS AFTER THE KNEADING COMPACTION. THESE CASES WERE ACCOMPANIED BY LOW STRENGTH. MIXES CONTAINING THREE QUARTZ MICROAGGREGATES SHOWED HIGHER STRENGTH WHEN THE GRADATION OF THE QUARTZ WAS CLOSE TO FULLER'S MAXIMUM DENSITY CURVE. /AUTHOR/]]></description>
      <pubDate>Fri, 05 Aug 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/100947</guid>
    </item>
    <item>
      <title>CONTROL OF ASPHALT PAVEMENT RUTTING WITH ASBESTOS FIBER</title>
      <link>https://trid.trb.org/View/100949</link>
      <description><![CDATA[RUTTING-TYPE FAILURES ARE INDUCED IN MINIATURE ASPHALT HIGHWAY PAVEMENTS WITH A TRAFFIC SIMULATOR MACHINE, WHICH DUPLICATES CRITICAL FACTORS OF ROADWAY TEMPERATURE GRADIENTS, VEHICLE TIRE PRESSURE, AND ACCUMULATED WHEEL PASSES. AN INVESTIGATION WAS MADE OF THE BENEFICIAL EFFECTS VARIOUS MINERAL ADDITIONS PRODUCED IN PAVEMENTS EXPOSED TO SEVERE SERVICE CONDITIONS. OF THE ADMIXTURES USED, ONLY A MIXTURE CONTAINING FINE CHRYSOTILE ASBESTOS FIBERS PREVENTED EXCESSIVE RUTTING AT NORMAL AND INCREASED ASPHALT CONTENTS. ASBESTOS MIXES HAVE SURPRISINGLY LOW SENSITIVITY TO ASPHALT CONCENTRATION OVER THE RANGE FROM 5.0 TO 8.0 WEIGHT PERCENT. WITH 85 TO 100 PENETRATION GRADE ASPHALT, ASBESTOS RAISED THE CRITICAL RUTTING TEMPERATURE TO LEVELS REACHED BY PAVEMENTS ON AN EXTREMELY HOT SUMMER DAY. AN ADDITIONAL ELEVATION OF ABOUT 20 F WAS ACHIEVED WITH 60 TO 70 PENETRATION ASPHALT AND SUITABLE CONTROL OF FIBER-ASPHALT RATIOS. BENCH SCALE TEMPERATURE-SUSCEPTIBILITY EVALUATIONS SUGGEST SIMPLE LABORATORY TEST PROCEDURES CAN MEASURE CRITICAL DESIGN PROPERTIES OF ASBESTOS-ASPHALT MIXTURES. THE STATIC TEMPERATURE INDENTATION PROCEDURE APPEARS TO YIELD RESULTS THAT COMPARE FAVORABLY WITH MINIATURE HIGHWAY TRAFFIC SIMULATOR MACHINE PERFORMANCES. FIBER LINKAGE IS A MECHANISM THAT MAY EXPLAIN THE RESISTANCE TO RUTTING WHICH ASBESTOS IMPARTS IN ASPHALT PAVING MIXTURES. SELECTIVE ADSORPTION ON THE SHORT CHRYSOTILE ASBESTOS FIBER COULD BOND OR LINK TOGETHER THE HEAVY, VISCOUS ASPHALT FRACTION. PAVEMENT STABILITY AGAINST RUTTING WOULD THEN DEPEND ONLY ON THE STRENGTH OF THE HEAVY FRACTION, THE AMOUNT PRESENT IN THE PAVING ASPHALT, AND THE PROPORTION ADSORBED BY THE ASBESTOS FIBER. /AUTHOR/]]></description>
      <pubDate>Fri, 05 Aug 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/100949</guid>
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