Center for Transportation Studies University of Minnesota
The asphalt mixture design and acceptance procedures for Minnesota Department of Transportation are currently
governed primarily by the mixture composition requirements put forth through use of various volumetric measures
(such as, air content, asphalt film thickness, aggregate gradation etc.). The asphalt binder has been required to meet
performance criteria through the Superpave asphalt binder specifications. This study looked at use of laboratory
performance test for asphalt mixtures. The study was conducted in three phases, first phase focused on merging the
asphalt mix design records with the pavement performance data to determine effects of mix design parameters on
asphalt pavement cracking performance. Second and third phase used a series of field sections across Minnesota to
conduct field performance evaluations as well as laboratory tests on field cored samples. The testing for second and
third phase of the study focused on using disk-shaped compact tension (DCT) fracture energy test as a laboratory
performance test. The findings form he first phase of study indicated that the asphalt binder type as defined by the
Superpave performance grade (PG) plays an important role in affecting the field cracking performance, majority of
mixture design parameters did not indicate a consistent effect on field cracking performance, this reinforces the
need for use of laboratory performance test as a mixture design tool as well as acceptance parameter. The DCT
testing results showed trends consistent with previous and other on-going research studies, whereby the asphalt
mixtures with higher fracture energies corresponded with pavements with lower amount of transverse cracking.
Laboratory Performance Test for Asphalt Concrete.
Center for Transportation Studies University of Minnesota.
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