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DYNAPAC had the opportunity to lay newly-developed open-porous asphalt (popcorn), two-layered, in thicknesses of 35 and 20 mm, with grain diameters of 12.5 and 9.5 mm, respectively, for the State of Georgia Department of Transportation, at the testing site of the National Center of Asphalt Technology (NCAT).
The paving field used is part of a 2.7 km long circuit, and had a width of 5.40 m and a length of 65 m. After completing the test section void contents between 22 and 24 Vol.-% were achieved.
Following completion of all individual fields using the most diverse mixture compositions, the test program was launched in September 2006, in the course of which a traffic load produced in 15 years would be simulated within 2 years. To this end, trucks loaded with steel plates, each pulling 2 trailers, drove over the testing area daily.
After 24 months of applying constant loads, the void contents and the initial evenness in this field were just the same as on the first day. Two additional fields were paved during the application process, using the same materials and a “hot upon cold“ method, but their results were less promising.
The results reinforce the prediction that, with Compactasphalt® technology, it is possible to adapt the durability of the top layer to the durability of the binder layer.
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