United States Department of Transportation
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Edition:Technical summary.
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Abstract:The Indiana’s SPS9-A site was initiated as a part of the
SHRP’s LTPP program in 1997 to study the influence
of binder grades on mixture performance. In the earlier
phase of this study entitled Development of Indiana’s
SPS9-A Site, five Superpave sections with different
binder grades (including one SBS-modified binder) and
one Marshall section were constructed on a 2.5-km
section along eastbound I-70 east of Indianapolis. Four
of the five Superpave mixes had the same aggregate
gradation, source and mix design. The remaining fifth
section contained 15% RAP and the same binder grade
as the control Superpave section. In an earlier study,
lab-compacted specimens from plant-produced mixtures
obtained at the time of construction were tested to evaluate
rutting and thermal cracking performance. Binders
recovered from field core samples at predetermined
intervals were tested. These results were compared with
findings from field distress surveys conducted within the
initial four-year study period. Discrepancies between the
observed pavement distress (cracking and rutting) and
mixture testing resulted in the initiation of the current
study, with a view to obtain two more sets of field core
samples for additional testing on recovered binders and
for assessing the cracking resistance of the mixtures by
directly testing the core samples at low temperatures.
The overall objective of this research project was to provide
long-term performance data of mixes with the same
job-mix formula (JMF) and gradation but with different
binder grades. It was also to allow evaluation of the longterm
performance of RAP.
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