Smooth, Quiet, and More Durable than ever

Recent years have seen a tunaround in the performance and use of porous asphalt surface courses, better known as Open Graded Friction Courses (OGFCs). New mixture designs offer reduced splash and spray in wet weather, improved wet-pavement skid resistance, better visibility of pavement markings and reduced noise levels.

In the early to mid-1980s, some states discontinued the use of and earlier version of OGFC because of premature failures. Today, a new generation of Open Graded Friction Courses is prompting a number of states, including some in northern climates, to take a renewed interest in these porous asphalt surfacings. These new mixtures have higher air voids, typically 18 to 22 percent, than earlier mixutures at 15 percent. Recent evidence shows that better performances and longer durability result from porous asphalt that uses polyme-modified binders. And fibres are being added to these new mixes to control draindown of the binder, which was a problem with the older mixtures.


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