Analisis Metoda AASHTO\u2793 Dalam Disain Tebal Lapisan Tambahan Pada Struktur Perkerasan Lentur Yang Dimodelkan Hanya Berdasarkan Lapisan Campuran Beraspal

. The application of an analytical overlay thickness design method for flexible pavement structures in Indonesia has not been issued as standard yet. Nonetheless, the AASHTO\u2793 method of which its previous edition was adopted as the main reference for the SNI\u2798 on Metoda Analisis Komponen has included an alternative overlay design procedure based on analytical principles by using pavement moduli resulting from back calculation process on deflection data. One important element of this design procedure is to modelling a 2-layered system structure. The first layer is to represent all pavement layers above the subgrade; and, the second layer is to represent the subgrade itself. The AASHTO\u2793 method assumes Poisson ratio of 0.50 for both layers. This paper analyses the effect of varying Poisson ratio on the resulting back calculated pavement moduli and on the overlay thickness design, and it also analyses an alternative 2-layered system model based only on asphalt layers as the first layer on top of granular layers and the subgrade as the second layer