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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>
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      <title>POZZOLANIC, AMORPHOUS SILICA PRODUCED FROM THE MINERAL OLIVINE</title>
      <link>https://trid.trb.org/View/695624</link>
      <description><![CDATA[Amorphous silica with high whiteness and surface can be produced by simply decomposing the basic mineral olivine in any acid. The result is a solution of magnesium and ferrous salts and silica slurry that can be purified by washing and filtering or decanting.  Such silica has been produced by treating an olivine mineral residue, a by-product of nickel ore recovery, by hydrochloric acid.  The free flowing silica residue, after drying at 105 degrees C, is proven to have pozzolanic activity (consumption of calcium hydroxide) by thermal analysis (DTA/TG) and by strength measurement of mortars where cement is replaced with silica.  The reactivity and strength gain were comparable to conventional silica fume obtained from ferrosilicon plants. The abundant mineral olivine can be a valuable source of amorphous silica for concrete technology, while the waste product lye could be used as a CO2 free magnesium chloride source for magnesium metal production, after purification.  The process could also use waste acids, from paper pulp industry.]]></description>
      <pubDate>Thu, 15 Nov 2001 00:00:00 GMT</pubDate>
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      <title>PARKING CONTROL BY THE 'PARK SYSTEM' IN CORK</title>
      <link>https://trid.trb.org/View/54109</link>
      <description><![CDATA[The park system of parking control was introduced to Cork in March 1975.  Parkers purchase park system 'discs' and indicate their time of arrival on these discs, which cannot be reused.  A before-and-after study to monitor the effectiveness of this system found that the volume of traffic in the city centre was reduced.  The number of parked vehicles inside the park system zone decreased, but there appeared to be a corresponding increase on the streets outside the zone.  The modal split remained approximately the same.  Illegal on-street parking inside the zone decreased significantly.  The system earned a substantial profit during its first year of operation.(a) /TRRL/]]></description>
      <pubDate>Wed, 12 Apr 1978 00:00:00 GMT</pubDate>
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      <title>OLIVINE SHEAR STRENGTH AT HIGH PRESSURE AND ROOM TEMPERATURE</title>
      <link>https://trid.trb.org/View/26638</link>
      <description><![CDATA[The shear strength of olivine (forsterite) varies from 1.77 kb at 5.5 kb coafining pressure to 15.2 kb at 50 kb confining pressure in room temperature shearing tests at strain rates from 1/sec to 10.3/sec.  Extreme grain granulation, increased undulatory extinction, diffuse X-ray patterns and refractive index reductions up to 0.030 are found in sheared pellets.  Extreme microfracturing and absence of recrystalization or gliding indicate predominantly brittle behavior.]]></description>
      <pubDate>Tue, 15 Jul 1975 00:00:00 GMT</pubDate>
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      <title>NEW APPROACH TO THE DYNAMIC BREAKAGE OF ROCK</title>
      <link>https://trid.trb.org/View/125857</link>
      <description><![CDATA[A NEW METHOD OF DYNAMIC BREAKAGE OF ROCK HAS BEEN DEVELOPED UTILIZING THE SECONDARY BREAKAGE EFFECT FROM AN ELECTRICAL PULSE PASSED THROUGH ELECTRODES INTO ROCK SPECIMENS. BREAKAGE WAS ACHIEVED FOR THE THREE ROCK TYPES TESTED: TRIASSIC SANDSTONE, OOLITIC LIMESTONE, AND OLIVINE BASALT. THE AMOUNT OF BREAKAGE WAS ANALYZED IN TERMS OF INCREASED SURFACE AREA USING A COMPUTERIZED STATISTICAL METHOD. FROM EXPERIMENTAL RESULTS AND A REVIEW OF AVAILABLE LITERATURE, IT SEEMS THAT THIS METHOD OF DYNAMIC BREAKAGE IS AT LEAST AS EFFICIENT AS CONVENTIONAL CHEMICAL BLASTING. /AUTHOR/]]></description>
      <pubDate>Mon, 18 Dec 1972 00:00:00 GMT</pubDate>
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