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Paving Bradley's Final Approach
By Greg Udelhofen
Editor
Fortunately for the Tollway, the existing pavement milled off the roadway contained 100-percent crushed aggregate. The SMA design for the project allows for up to 15-percent fine aggregate RAP. Following test strips and construction of temporary travel lanes, it was determined that a Trap Rock aggregate would provide the best results for SMA mix containing 15-percent FRAP material. Mix designs being used on the main travel lanes of the project include:
On the 12-inch asphalt being placed over the rubblized concrete:
3 1/2-inch N50, IL-19, base course containing 40- to 50-percent FRAP with PG 58-28 AC
3 1/2-inch N90, IL-19, binder course containing 40-percent FRAP with PG 58-22 AC
3-inch N80 SMA/GTR binder course containing 15-percent fine-aggregate FRAP with PG 76-22 AC
2-inch N80 SMA/GTR surface course containing 15-percent fine-aggregate FRAP with PG 76-22 AC
On the 15-inch full-depth portions:
3-inch N50, IL-19, base course containing 40- to 50-percent FRAP with PG 58-28 AC
3 1/2-inch N70, IL-19, binder course containing 40-percent FRAP with PG 58-22 AC
3 1/2-inch N90, IL-19, binder course containing 25-percent FRAP with PG 58-22 AC
3-inch N80 SMA/GTR binder course containing 15-percent fine-aggregate FRAP with PG 76-22 AC
2-inch N80 SMA/GTR surface course containing 15-percent fine-aggregate FRAP with PG 76-22 AC
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