Masaya HIDA
Fundamental study on application of Superpave mix design method to Japanese airfield asphalt pavements
Osamu TAKAHASHI
Airfield pavements in Japanese busy airports have experienced premature surface failures because of a rapid increase of airport demand.
These pavements are seeking another design method which can architect a more durable HMA mixture.
This study discussed application of the Superpave mix design method to Japanese airfield asphalt pavements, especially for taxiways.
The objectives of the study are to evaluate applicability of the Superpave design method and to obtain fundamental information for architecting a Japanese guideline.
It is firstly necessary to set a design number of gyration, Ndes, on the design procedure in order to newly apply the Superpave design to a pavement with the different loading condition.
Based on the bulk densities of core-cut samples from Haneda Airport, the degree of mixture densification for ten years operation was estimate and the Ndes was installed as 105 times.
Secondly, this study investigated an appropriate aggregate gradation which can introduce high rutting resistance.
The Bailey method was used to assess and select a better aggregate combination.
Thirdly, mixture performance of the designed HMA, namely rutting resistance and fatigue cracking resistance were evaluated and compared with the original Haneda mix.
As the results, it was confirmed that the Superpave is a promising design method for Japanese airfield pavements. Some useful information of aggregate gradation selection could also be derived.
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