Understanding Mechanisms of Raveling to Extend Open Graded Friction Course (OGFC) Service Life
The Florida Department of Transportation recently released a report that considers the mechanisms of raveling in OGFC mixtures by utilizing experimental measurements and finite element modeling.
The mixtures used in the lab experiment were characterized by permeability, Cantabro loss, indirect tensile (IDT) strength, and Hamburg wheel tracking test. The study found that the Cantabro loss test was the best predictor of the OGFC mix durability when compared to performance observed in the field. Additionally, the study suggested that the binder content and air void content were the mix-related factors that increase the probability of raveling. Additionally, the modeling identified that slow speed vehicles, extreme temperatures, and heavy traffic loads were detrimental to OGFC.
SCDOT has ongoing research of OGFC with Clemson University. In 2012, they released a report evaluating the construction, maintenance and performance of these mixtures.