United States Department of Transportation
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Analysis of seasonal strain measurements in asphalt materials under accelerated pavement testing and comparing field performance and laboratory measured binder tension properties.
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2009-06-01
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By Elseifi, M.
[PDF-1.96 MB]
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Edition:Final report; 2008.
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Abstract:Seasonal variation of measured pavement responses with temperature and its relationship to pavement performance has not been
thoroughly evaluated for ALF Experiments II and III. Such information may be used to improve instrumentation strategies in future
ALF experiments. These results may also be used to establish the relationship between binder elongation properties at intermediate
and low temperature and mix performance. Such link may be used to update current binder standards by specifying measurement of
properties that are indicative of pavement performance. Such properties may be obtained by complementing or modifying current
specifications with the direct tensile test or the multiple stress creep recovery test instead of the current ductility test. The objectives
of this study were two fold. First, instrument responses in past ALF Experiments were analyzed to quantify the impacts of seasonal
variation of pavement responses with temperature and its relationship to pavement performance. Second, nine straight asphalt binders
obtained from two asphalt suppliers were tested to link laboratory measured properties to mix performance. Based on the results of
this analysis, it is concluded that survivability and repeatability of the gages were acceptable in past experiments. However, strain
gages were not a reliable indicator of damage development in hot-mix asphalt (HMA). Laboratory test results showed that a binder
that provides high ductility at intermediate temperature would be characterized by poor elongation properties at low temperature. This
trend was related to the binder fractional compositions as an increase in the binder content of low molecular weight results in an
increase in its ductility at intermediate temperature. However, an increase in paraffinic maltene content results in the binder tending to
crystallize at higher temperature as it approaches the glassy region. Based on the results of laboratory testing conducted in this study,
it is recommended that the ductility test be kept in the state binder’s specifications as it correlates well with mix performance at
intermediate temperature. This test may not be substituted with the direct tensile test or the multiple stress creep recovery test.
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