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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>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
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    <item>
      <title>SOME OBERSERVATIONS ON THE INTERPRETATION OF CREEP DATA</title>
      <link>https://trid.trb.org/View/120130</link>
      <description><![CDATA[SOME PUBLISHED CONCEPTS OF THE NATURE OF CREEP BETRAY MISUNDERSTANDING OF THE ROLE PLAYED BY ABSORBED WATER. STRONGLY ABSORBED WATER IS A STRUCTURAL, LOAD-BEARING COMPONENT WHICH MUST CHANGE IN QUANTITY AS WELL AS IN THE STATE OF STRESS WHEN THE SYSTEM CHANGES FROM ONE STATE OF MECHANICAL EQUILIBRIUM TO ANOTHER. THIS CHARACTERISTIC OF ABSORBED WATER ACCOUNTS FOR REVERSIBLE CREEP. A SIMPLE, NEW RHEOLOGICAL MODEL SHOWS THE REQUIREMENTS FOR RE-ESTABLISHING MECHANICAL AND THERMODYNAMIC EQUILIBRIUM AFTER A LOAD IS APPLIED, AND AFTER REMOVAL. REVERSIBLE CREEP INVOLES LOSS AND GRAIN OF WATER. CREEP DOES NOT TRANSFER THE STRESS IN WATER TO THE SOLID FRAME WORK. THE RELATION OF CREEP TO SHRINKAGE, AND SEVERAL OTHER ASPECTS OF THE TOPIC ARE DISCUSSED. /AUTHOR/]]></description>
      <pubDate>Sun, 15 Aug 2004 02:34:13 GMT</pubDate>
      <guid>https://trid.trb.org/View/120130</guid>
    </item>
    <item>
      <title>THERMAL VOLUME CHANGES OF THE MINERAL-WATER SYSTEM IN LOW-POROSITY CLAY SOILS</title>
      <link>https://trid.trb.org/View/290692</link>
      <description><![CDATA[The effect of temperature on the volumetric strains of the clay skeleton and clay-water system has been examined experimentally.  Heating tests at (various) constant effective stress and isotropic loading tests at (various) constant temperatures were performaed on low-porosity clays under drained conditions.  The results indicate that the thermal expansion of adsorbed water in these clays is significantly lower than that of free water.  Depending on the effective pressure, the clay skeleton may undergo either compression or expansion.]]></description>
      <pubDate>Tue, 28 Feb 1989 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/290692</guid>
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    <item>
      <title>NMR RELAXATION STUDY OF ABSORBED WATER IN CEMENT AND C/3S PASTES</title>
      <link>https://trid.trb.org/View/73727</link>
      <description><![CDATA[The deuteron and proton spin-lattice and spin-spin relaxation times of absorbed water in commercial portland cement and tricalcium silicate pastes were studied as functions of the hardening time at room temperature.  The time dependence of the water self diffusion coefficient of tricalcium silicate pastes was also followed.  The proton and the deuteron decrease markedly as hydration increases and the pastes harden due to the increase in the active surface and the number of adsorptive sites, thus providing convenient tools for studying the nature of the hydration process.]]></description>
      <pubDate>Thu, 14 Sep 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/73727</guid>
    </item>
    <item>
      <title>INTERACTION OF HARDENED CEMENT PASTE AND WATER</title>
      <link>https://trid.trb.org/View/100485</link>
      <description><![CDATA[ADSORPTION OF WATER VAPOR ON A CLEAN SURFACE CHANGES THE SURFACE FREE ENERGY. IT IS SHOWN THAT, USING THE GRIFFITH CRITERION, THE CHANGE OF STRENGTH AS FUNCTION OF MOISTURE CONTENT CAN BE EXPLAINED BY ASSUMING A CHANGE OF SURFACE ENERGY. IN COLLOIDAL PARTICLES SURFACE ENERGY CREATES CONSIDERABLE HYDROSTATIC PRESSURE. A CHANGE IN ELASTIC MODULUS AND SHRINKAGE AS WELL AS SWELLING CAN BE RELATED TO A CHANGE IN HYDROSTATIC PRESSURE IN INDIVIDUAL GEL PARTICLES. CREEP IS AFFECTED PRIMARILY AT THE HIGHER RELATIVE HUMIDITIES. THE MAIN PARAMETERS OF A PROPOSED MODEL FOR HYDRATED PORTLAND CEMENT ARE SURFACE FREE ENERGY AND DISJOINING PRESSURE. ON THIS BASIS THE MECHANICAL BEHAVIOR OF HARDENED CEMENT PASTE IS DISCUSSED. A PHASE TRANSITION OF ADSORBED WATER NEAR 90 DEGREES C IS DISCUSSED. THE INFLUENCE OF THIS EFFECT ON THE MECHANICAL BEHAVIOR OF HARDENED CEMENT PASTE CAN BE UNDERSTOOD WHEN A CHANGE IN INTERFACIAL ENERGY IS TAKEN INTO CONSIDERATION. /AUTHOR/]]></description>
      <pubDate>Thu, 11 Apr 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/100485</guid>
    </item>
    <item>
      <title>RESIDUAL SHEAR STRENGTH</title>
      <link>https://trid.trb.org/View/127535</link>
      <description><![CDATA[AN EXPLANATION IS GIVEN FOR THE DEPENDENCE OF THE RESIDUAL ANGLE OF INTERNAL FRICTION OF SOIL ON CLAY CONTENT. ONCE RESIDUAL CONDITIONS ARE ATTAINED, THE SOIL IS SEPARATED BY A FAILURE PLANE INTO TWO RIGID BLOCKS THAT SLIDE OVER ONE ANOTHER. IF C IS THE CLAY FRACTION DEFINED AS THE VOLUME OF CLAY DIVIDED BY THE VOLUME OF SOLIDS, THEN AS A FIRST APPROXIMATION PROPORTION C OF THE SLIDING SURFACE OF ONE BLOCK IS CLAY AND (1-C) IS SAND (THE SOIL BEING CONSIDERED A MIXTURE OF SAND AND CLAY). AT ANY MOMENT PROPORTION C OF THE CLAY PROPORTION OF THE FIRST BLOCK IS SLIDING OVER THE CLAY IN THE SECOND BLOCK. THUS PROPORTION C SQUARED OF THE FAILURE SURFACE HAS CLAY SLIDING ON CLAY, (1-C) SQUARED HAS SAND SLIDING ON SAND, AND THE REMAINING 2C(1-C) HAS CLAY ON SAND. UNDER THE ASSUMPTION THAT THE DIRECT STRESS IS DISTRIBUTED WITH EQUAL INTENSITY OVER THE VARIOUS PARTS OF THE FAILURE PLANE, EXPRESSIONS ARE DEVELOPED DESCRIBING THIS DEPENDENCE. FOR MORE ACTIVE AND SOFTER CLAYS IT MAY BE THAT CLAY CONTENT SHOULD BE BASED ON THE VOLUME OF CLAY PLASMA CONCEIVED AS A SINGLE PHASE COMPRISING THE CLAY MINERAL AND ITS ADSORBED WATER.]]></description>
      <pubDate>Mon, 03 May 1971 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/127535</guid>
    </item>
    <item>
      <title>A HYPOTHESIS ON MECHANISM OF CREEP OF CONCRETE WITH REFERENCE TO MULTIAXIAL COMPRESSION</title>
      <link>https://trid.trb.org/View/96566</link>
      <description><![CDATA[IT IS SUGGESTED THAT CREEP IS DUE TO ORIENTED INTERNAL MOISTURE DIFFUSION CAUSED BY A FREE ENERGY GRADIENT AND TO SLOW DEFORMATION OF THE ELASTIC SKELETON OF THE GEL INDUCED BY VISCOUS DEFORMATION OF ADSORBED WATER. SHRINKAGE ACTUALLY REALIZED IS AFFECTED BY THE RELIEF OF THE STRESS IN THE ELASTIC SKELETON BY CREEP. THE NATURE OF MOISTURE DIFFUSION SUGGESTS THAT CREEP STRAINS MAY NOT BE SUPERPOSABLE UNDER MULTIAXIAL STRESS. CREEP RECOVERY IS SHOWN TO DEPEND BOTH ON CREEP AT THE TIME OF UNLOADING AND ON MAGNITUDE OF ELASTIC STRAIN RECOVERY. A RHEOLOGICAL MODEL IS PROPOSED. SOME SUPPORTING EXPERIMENTAL DATA ARE PRESENTED. /AUTHOR/]]></description>
      <pubDate>Mon, 13 Apr 1970 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/96566</guid>
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