An independent study was recently conducted to determine how the physical and chemical properties of Gilsonite® uintaite performed compared to Trinidad Lake Asphalt (TLA). The study compared a typical mastic asphalt bitumen modified with 24.4% TLA and formulations of bitumen modified with Gilsonite® at significantly lower concentrations of 5% and 6%. All of the formulations used a bitumen content of 8.2% in order to yield acceptable results in workability as well as deformation resistance.
Compared to the TLA mixture, the samples modified with Gilsonite® uintaite:
Increased the softening point, which would result in a greater resistance to rutting.
Increased viscosity and elasticity, which reduces the likelihood of roadway cracking.
Showed lower static and dynamic indentation, indicating a greater resistance to permanent deformation.
Demonstrated superior cold temperature performance, with both greater breaking strength and the ability to withstand colder temperatures.
Used only one-fifth as much product, which would mean faster and simpler mixing, reduced costs of shipping and handling and greatly reduced material costs.
The findings clearly demonstrated that Gilsonite®-modified binders can help make stronger, longer lasting roads, and that Gilsonite® uintaite should be considered an advantageous alternative to the industry’s current mastic asphalt standard.
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