Analysis of seasonal strain measurements in asphalt materials under accelerated pavement testing and comparing field performance and laboratory measured binder tension properties.

Details

• Creators:
  Elseifi, M.
• Corporate Creators:
  Louisiana State University (Baton Rouge, La.). Department of Civil and Environmental Engineering
• Corporate Contributors:
  Louisiana Transportation Research Center
• Subject/TRT Terms:
  Accelerated Life Testing Accelerated Tests Asphalt Pavements Pavements, Asphalt--Testing Strain Measurement Strains And Stresses--Measurement Stresses
• Publication/ Report Number:
  FHWA/LA.09/444
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Edition:
  Final report; 2008.
• Corporate Publisher:
  Louisiana Transportation Research Center
• 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.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:6d8e8c7bf37d935c4a5eb7ca033071ceb77a7b90929ac1961ffe17e1b0a1602c
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17665/dot_17665_DS1.pdf
• File Type:
  [PDF - 1.96 MB ]