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Updated: November 18th, 2008 03:26 PM GMT-05:00

High FRAP content generates savings

Asphalt Paving

Illinois Tollway Asphalt Paving
The Illinois Tollway designed this project to use a high percentage of fractionated reclaimed asphalt pavement (FRAP) in its HMA and SMA (stone matrix asphalt) mixes.
Illinois Tollway Asphalt Paving Equipment
Why did the Tollway choose asphalt? "All the work we do has a standard we need to address and through the research we do on a project, asphalt proved to be the best solution," says Paul Kovacs, chief engineer for the project.
Hypac Tandem Vibratory Roller - Asphalt compaction
To avoid shoving of the mat, lighter vibratory rollers, operating in static mode, perform the initial compaction before the heavier tandem rollers began their roller patterns.

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Greg Udelhofen
By Greg Udelhofen
Editor

Out on the project, roller operators were experiencing some shoving of the mat when trying to compact the SMA mix with heavy tandem rollers. That problem was solved by using lighter vibratory rollers, operating in static mode, to perform the initial compaction before the heavier tandem rollers began their roller patterns.

The Tollway and paving contractors are on scheduled to complete the eastbound portion of the project this month and all indications point to a smooth, less congested and safe ride for the motorists.
With the success of this project, the Illinois Tollway has established new production and construction standards for higher RAP mixes and GTR in SMA mixes for all future projects. Adopting the new standards not only supports a sustainability approach to constructing quality pavements, but it also saves the road agency and its users millions of dollars in the construction and maintenance of the system.

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