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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>VARIABILITY IN ROADBASE LAYER PROPERTIES CONDUCTING INDIRECT TENSILE TEST</title>
      <link>https://trid.trb.org/View/501676</link>
      <description><![CDATA[Knowledge of variabilities in the properties of asphalt pavement layers is valuable in the structural evaluation of pavements. Mix composition and construction procedure influence the mechanical properties of bituminous layers.  Fatigue and stiffness characteristics are two of the most important parameters in input data to pavement evaluation models.  In this study, more than 300 cores from 15 test sections were drilled from roadbase layers for determining mix composition, fatigue and stiffness properties.  These cores have been tested at different temperatures when conducting the Indirect Tensile Test (ITT).  The ITT, which is probably most suitable for examining specimens from pavement layers, has proved to be sufficiently accurate for routine use, such as determination of mix properties, and also in quality control.  A good correlation has been found between laboratory based and field based fatigue curves for the roadbase mix.  Statistical fatigue relationships based on the laboratory measurements are also presented and the effects of the variabilities in the mix properties are illustrated.  It is hoped that knowledge of the characteristics of bituminous pavement layers with their variations and the use of ITT in routine measurements may contribute to further utilization of pavement evaluation models by road engineers.]]></description>
      <pubDate>Mon, 14 Jun 1999 00:00:00 GMT</pubDate>
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      <title>VARIABILITY IN ROADBASE LAYER PROPERTIES CONDUCTING INDIRECT TENSILE TEST: PAPER PRESENTED AT THE ISAP CONFERENCE IN SEATTLE, USA, AUGUST 1997</title>
      <link>https://trid.trb.org/View/487121</link>
      <description><![CDATA[Knowledge of variabilities in the properties of asphalt pavement layers is valuable in the structural evaluation of pavements. Mix composition and construction procedure influence the mechanical properties of bituminous layers. Fatigue and stiffness characteristics are two of the most important parameters in input data to pavement evaluation models. In this study, more than 300 cores from 15 test sections were drilled from roadbase layers for determining mix composition, fatigue and stiffness properties. These cores have been tested at different temperatures when conducting the Indirect Tensile Test (ITT). The ITT, which is probably most suitable for examining specimens from pavement layers, has proved to be sufficiently accurate for routine use, such as determination of mix properties, and also in quality control. A good correlation has been found between laboratory based and field based fatigue curves for the roadbase mix. Statistical fatigue relationships based on the laboratory measurements are also presented and the effects of the variabilities in the mix properties are illustrated. It is hoped that knowledge of the characteristics of bituminous pavement layers with their variations and the use of ITT in routine measurements may contribute to further utilization of pavement evaluation models by road engineers. (A)]]></description>
      <pubDate>Fri, 31 Jul 1998 00:00:00 GMT</pubDate>
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      <title>EVALUATION OF INDIRECT TENSILE TEST FOR DETERMINING THE STRUCTURAL PROPERTIES OF ASPHALT MIX. FINAL REPORT</title>
      <link>https://trid.trb.org/View/412307</link>
      <description><![CDATA[Engineering characterization of Louisiana's asphaltic concrete mixtures using the indirect tensile test was the focus of a recent comprehensive research program sponsored by the Louisiana Transportation Research Center (LTRC).  Large variations in test results were observed between similar specimens.  These variations were attributed to variable aggregate orientation, compaction procedure and the test device.  A new indirect tension device, developed by Michigan State University and further modified by LTRC, was fabricated locally and used in order to reduce the test variability.  The objective was to evaluate the repeatability and performance of the new modified indirect tension device.  Two test factorials were designed to assess the devices' performance and repeatability.  The first was statistically designed to examine the variation of several test parameters for a specific asphaltic concrete mixture between the modified and the current LTRC test devices.  The second was designed to investigate the variation in results between the modified and current test devices due to materials properties. Mechanical tests conducted were the indirect tensile strength test, the diametral resilient modulus test, and the indirect tensile creep test.  Phase I of this research presents the effect of the test devices, deformation measurement system, and operator error on the mechanical properties of a specific asphalt concrete mixture.  Phase II shows the influence of mixture type, asphalt cement source, and compaction effort on the same mechanical properties.  The results indicated the following:  use of two LVDTs to measure vertical deformations has reduced variation in test results; both test devices provided repeatable results; mechanical properties were not significantly different due to operator error; mechanical properties measured with the modified test device were significantly different than those measured with the existing test device; the modified test device can better capture the temperature effect on the resilient modulus than the existing test device; and resilient modulus and Poisson's ratio were significantly different between mixture types.]]></description>
      <pubDate>Thu, 16 Mar 1995 00:00:00 GMT</pubDate>
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      <title>EVALUATION OF INDIRECT TENSILE TEST FOR DETERMINING STRUCTURAL PROPERTIES OF ASPHALT MIX</title>
      <link>https://trid.trb.org/View/389662</link>
      <description><![CDATA[The indirect tensile test can be used to establish the structural properties of asphalt mixtures.  Existing indirect tension test devices have several problems that can affect the accuracy and repeatability of test results.  Because of these problems, a new indirect tension test device, developed by Michigan State University and further modified by Louisiana Transportation Research Center (LTRC), was fabricated locally and used to reduce the test variability.  The variation between several structural properties was investigated for specimens tested in two different indirect tension test devices--the current LTRC test device and the Louisiana modified device--within the parameters of mixture type, asphalt cement source, and compaction effort.  Mechanical tests conducted were the indirect tensile strength test, the diametral resilient modulus test, and the indirect tensile creep test.  The results of the test program indicated that the mechanical properties measured with the modified test device were significantly different from those measured with the existing test device; the modified test device can capture the temperature effect on the resilient modulus better than the existing test device; and resilient modulus and Poisson's ratio were significantly different between mixture types.]]></description>
      <pubDate>Mon, 18 Apr 1994 00:00:00 GMT</pubDate>
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