A comparative study of SMA and dense graded HMA mixtures using a laboratory rutting test and accelerated pavement testing
2020
The objective of the study was to evaluate stone matrix asphalt (SMA)
and hot mix asphalt (HMA) rutting performance using accelerated
pavement testing (APT) and the Hamburg wheel track test (HWTT) and
to understand how their performance relates to rutting predictions
obtained from the PavementME. To do this, rutting results from a
recent APT study that analyzed the performance of both SMA and HMA
in a typical Indiana full-depth pavement structure were compared to
HWTT and PavementME rutting results. It was found that both the APT
and HWTT provide clear distinctions between the SMA and HMA mixtures
and both showed trends of relative rutting resistance. Results also
indicate the HWTT and APT outcomes are not comparable in magnitude.
This could be explained by the HWTT having a testing environment
that is more aggressive than the APT. PavementME predictions were
comparable to total pavement rutting measurements from the APT, but
the software was not capable of identifying the superior rutting
performance of SMA.
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