الفهرس 
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Abstract
The rheological properties of asphalt binder as a viscoelastic material, play an important role in regulating cohesion and internal friction of hot mix asphalt (HMA), in integration with aggregates interlocking, to protect the asphalt concrete pavement (ACP) surface layer against any inadvertent loads. Due to the recent worldwide increase in the combination of individual wheel load (IWL) and tire pressure of the new-type aircraft, shear related distresses have been observed in some Egyptian airfields. Top-Down cracks (TDCs) have been also reported as one of the most surface deterioration in this perspective. Moreover, creep has been arising in ACP especially, in southern latitude airports, where surface layer is exposed excessively to high temperature ambient. In this decade, the criterion of admissible octahedral shear stresses (OSSs) in the flexible surface layer, has been used successfully as a judicious design tool, for the accurate assessment of ACP performance. Consequently, the aim of this work, was to study the impact of using bitumen products through different two Egyptian companies (Alex and Suez), modified by recycled low density polyethylene (LDPE), on the OSS resistance of ACP surface layer. OSS related rutting and cracking criteria of HMA have been subject to intensive evaluation in the light of mechanistic-empirical (M-E) methodology. In this context, a number of simple performance tests (SPTs) such as, flow number (FN) test, dynamic modulus (E*) test and tri-axial compression test have been applied on typical dense-graded HMA samples, “which were designed by Marshall Method”. The obtained E* results were compared to other data estimated by standard E* predictive mathematical models such as Hirsch,