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:

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