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Abstract:This limited study provided a laboratory and field comparative evaluation of PG 76-22 HMA
hot mix asphalt (HMA) mixture and a mixture containing the additive “Sasobit®.” The
fundamental material characterization testing (asphalt cement binder rheology, durability,
and permanent deformation) was performed. The mixtures’ durability (moisture
susceptibility) and permanent deformation (rutting) was measured by the Modified Lottman
and Loaded Wheel Tracking (LWT) (Hamburg type) tests. In addition, the influence of
Sasobit® on compaction through roadway and laboratory density comparisons was examined.
The results of the tests performed on PG 76-22 HMA and Sasobit® mixtures considered in
this study showed that the use of the Sasobit® additive had no significant affect in terms of rut
resistance and moisture susceptibility. The addition of Sasobit® may adversely affect the low
temperature properties of the original asphalt cement binder being utilized as observed
through asphalt cement binder rheology testing.
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