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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>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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      <title>MICROCRACKING OF HIGH AND NORMAL STRENGTH CONCRETES UNDER SHORT- AND LONG-TERM LOADINGS</title>
      <link>https://trid.trb.org/View/295962</link>
      <description><![CDATA[The effects of both monotonic and sustained uniaxial compressive stresses on the relationships among microcracking, strength, and deformation of high-strength concrete were studied using x-ray techniques and compared with those of low and medium strength comcretes.  The formation, propagation, and stability of microcracks and their contribution to the failure of concrete under both types of loadings are examined and discussed.  The stress levels investigated ranged from 40 to 95% of ultimate for the three materials.  High-strength concrete showed significntly smaller amounts of cracking at all stress levels than normal strength concretes.  As a result, lesser inelastic deformations and higher creep-stress linearity limits were associated with the former rather than with the others.]]></description>
      <pubDate>Wed, 31 May 1989 00:00:00 GMT</pubDate>
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      <title>MODIFICATION OF THE X-RADIOGRAPHY TECHNIQUE TO INCLUDE A CONTRAST AGENT FOR IDENTIFYING AND STUDYING MICROCRACKING IN CONCRETE</title>
      <link>https://trid.trb.org/View/289585</link>
      <description><![CDATA[The utility of X-radiography for the study of microcracking in concrete is significantly enhanced by impregnating cracks and voids with a lead-nitrate contrast agent.  When an X-ray flux is passed through a polished concrete specimen, X-rays are readily attenuated by the contrast agent in the cracks, which produces a sharp tonal contrast in the resulting radiograph between cracks and surrounding concrete. Radiographs obtained using this technique are compared with more conventional X-ray images of the same specimens.  This method is similar in concept to neutron radiography, in which a neutron-attenuating contrast agent is used for enhancing crack images.]]></description>
      <pubDate>Wed, 30 Nov 1988 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/289585</guid>
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      <title>ANALYSIS OF THE STATE OF RESIDUAL ELASTIC STRAIN IN QUARTZOSE ROCKS BY X-RAY DIFFRACTION</title>
      <link>https://trid.trb.org/View/30646</link>
      <description><![CDATA[The residual elastic strain in an oriented quartzite sample taken from outcrop is measured by means of x-ray diffraction. Two disks cored at right angles to each other are cut parallel to the XY plane and the Z axis respectively of a rectangular coordinate system related to the field orientation. Six solutions for the principal strain axes are calculated by computer analysis. The technique permits a general solution of the three-dimensional state of residual elastic strain in naturally deformed rocks.]]></description>
      <pubDate>Mon, 29 Mar 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/30646</guid>
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    <item>
      <title>ANALYSIS OF THE STATE OF RESIDUAL ELASTIC STRAIN IN GUARTZOSE ROCKS BY X-RAY DIFFRACTION</title>
      <link>https://trid.trb.org/View/32160</link>
      <description><![CDATA[The residual elastic strain in an oriented quartzite sample taken from outcrop is measured by means of x-ray diffraction.  Two disks cored at right angles to each other are cut parallel to the XY plane and the Z axis respectively of a rectangular coordinates system related to the field orientation.  Six solutions for the principal strain axes are calculated by computer analysis.  The technique permits a general solution of the three- dimensional state of residual elastic strain in naturally deformed rocks.  /FHWA/]]></description>
      <pubDate>Mon, 29 Mar 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/32160</guid>
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      <title>MECHANICAL BEHAVIOR OF MATERIALS- PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON MECHANICAL BEHAVIOR OF MATERIALS.\VOLUME 5:\COMPOSITES:\TESTING AND\EVALUATION</title>
      <link>https://trid.trb.org/View/22714</link>
      <description><![CDATA[The first section of this volume contains 28 papers concerned mainly with the mechanical behavior of various composite materials, including fiber-reinforced composites and laminated composites. The second section contains 23 papers which discuss the testing and evaluation of composites, including x-ray stress analysis, hardness testing, Moire fringe technique & ultrasonic wave method and the measurement of various mechanical properties. /TRRL/]]></description>
      <pubDate>Thu, 29 May 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/22714</guid>
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      <title>PATTERNS OF STRAIN IN STRENGTH TEST SAMPLES</title>
      <link>https://trid.trb.org/View/126290</link>
      <description><![CDATA[THE PAPER DESCRIBES EXPERIMENTS IN WHICH THE DISTRIBUTION OF INTERNAL STRAIN WITHIN STRENGTH TEST SAMPLES OF VARIOUS FORMS ARE MEASURED USING X-RAYS. THE FORMS EXAMINED ARE THE TRIAXIAL CYLINDER AND CUBE UNDER AXIAL EXTENSION, THE CUBE UNDER AXIAL COMPRESSION, AND THE RECTANGULAR PLANE STRAIN COMPRESSION SAMPLE. THE INFLUENCE OF END RESTRAINT ON THE STRAIN PATTERNS IS INVESTIGATED. THE RESULTS GIVE PROOF OF THE BENEFITS OF USING LUBRICATED PLATENS IN THE CYLINDRICAL TRIAXIAL EXTENSION TEST AND IN THE PLANE STRAIN COMPRESSION TEST IN PROVIDING HOMOGENEOUS STRAIN STATES WITHIN THE SAMPLES. STRAIN HOMOGENEITY IS IN GENERAL NOT PRESENT IN THE SAMPLES TESTED WITH ROUGH PLATENS. RIGID ZONES DEVELOP AT THE ROUGH PLATENS IN THESE TESTS AND THE CONVENTIONAL ASSUMPTION OF EQUALITY BETWEEN THE RADIAL AND TANGENTIAL STRAINS IN THE CYLINDRICAL EXTENSION TEST IS PROVED INVALID. WITH REFERENCE TO CUBE SAMPLES, WHICH WERE TESTED WITH LUBRICATED PLATENS, STRAIN PATTERNS GIVING A HIGH DEGREE OF HOMOGENEITY WERE OBTAINED IN BOTH TRIAXIAL EXTENSION AND COMPRESSION. THESE CUBE TESTS GAVE STRESS RATIO- AXIAL STRAIN-LATERAL STRAIN RELATIONSHIPS COMPARABLE TO THOSE OBTAINED FROM LUBRICATED CYLINDRICAL TESTS REPORTED HERE AND PREVIOUSLY. THERE IS NOTHING IN THE RESULTS TO SUGGEST REASONS FOR DIFFERENCES IN EXTENSION STRENGTHS MEASURED IN THE CYLINDRICAL AND CUBE SAMPLES REPORTED BY SOME INVESTIGATORS. /AUTHOR/]]></description>
      <pubDate>Wed, 14 Nov 1973 00:00:00 GMT</pubDate>
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