Use of Porous Friction Course to Retard Reflection Cracks in Bituminous Overlaysby Stanley M. Herrin, Crawford, Murphy & Tilly, Springfield, United States,
Robert Gorman, Crawford, Murphy & Tilly, Springfield, United States,
Abstract: Porous Friction Courses (PFC) are open-graded, high air void, bituminous mixtures that are applied to pavement surfaces to improve skid resistance. In 1989, PFC was used as an interlayer before placing a bituminous overlay on the runway at of Pekin Municipal Airport. In this paper, the authors present results and conclusions about the design, construction and performance of the use of PFC as a stress relief interlayer. It was concluded that PFC retards reflective cracks, waterproofs the pavement easier to put at uniform thickness and that it cannot prevent cracking caused by rapid air temperature changes. In addition, delamination often occurs when a PFC is placed directly on a PCC pavement and it is recommended that a 1 inch minimum layer of bituminous concrete be placed on the PCC pavement prior to placing the PFC in order to prevent delamination.
Subject Headings: Asphalts | Pavement overlays | Concrete pavements | Pavement condition | Airport and airfield pavements | Cracking | Porous media | Asphalt concrete
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