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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>FLY ASH EFFECTS: III. THE MICROAGGREGATE EFFECT OF FLY ASH</title>
      <link>https://trid.trb.org/View/750065</link>
      <description><![CDATA[Unreacted fly ash particle can still contribute to the properties of cement stone; this is known as the microaggregate effect of fly ash.  In this article, the authors report on a systematic study of the microaggregate effects of fly ash; the study includes micromechanics, the hypothesis of center particle and pore size distribution.  The authors note that the microaggregate effect is strengthened with the increase of content of fly ash, but weakened with age.  From the micromechanics viewpoint, the volume fraction of microaggregate decreases with age because of the pozzolanic reaction of fly ash.  In the center particle hypothesis, the center particle becomes smaller because of the pozzolanic reaction of fly ash and the space of center particle increases.]]></description>
      <pubDate>Tue, 08 Feb 2005 00:00:00 GMT</pubDate>
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      <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>
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