Evaluation of Permeable Friction Course Mixes with Various Binders and Additives

Abstract

The object of this study was to evaluate the effects of several common combinations of binder types and additives on the functionality and durability of permeable friction course (PFC) mixes. Three binder types (i.e., conventional asphalt AR-80 and two polymer-modified asphalt binders) and two additives (i.e., cellulose fiber and hydrated lime) were selected for a 19-mm nominal maximum aggregate size gradation. A series of laboratory tests was conducted to analyze PFC pavement surface performance-related properties, including air-void content, permeability, moisture sensitivity, friction, resistance to raveling, and resistance to permanent deformation. Results showed that using polymer-modified binders instead of unmodified asphalt in the open-graded mixture increased air voids and permeability. Mixes using polymer-modified asphalt or those treated with hydrated lime were shown to increase the mixture resistance to moisture damage, raveling, and rutting. The aging index value was higher for the conventional binder compared to polymer-modified asphalt.