Abstract: For a long time, standard Egyptian penetration grade 60/70 bitumen which is actually equivalent to (PG64-22), used to provide a satisfactory ACP performance with current combination of (18t IWL ,1.35 MPa tire pressure). However, by the recent changing the bitumen fractional composition due to bitumen’s origin or/ and different refining techniques, many shear related distresses has been reported. Moreover, top-down cracks (TDCs) have been also observed as one of the most surface distresses in this perspective. Moreover, creep has been reported also 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 state of art of using bitumen products through different bitumen types modified by recycled low density polyethylene (LDPE), and its impact on the OSS resistance of ACP surface layer.
Keywords: Airfields AC pavement distresses, Enhanced PG LPDE modified binder, Octahedral shear stress.
Title: Improving the bitumen in HMA to resist the effect of Octahedral Shear Stresses on asphalt pavement surface layer
Author: Ahmed Eraky, H. S. Ayoub, Omar Osman, Mohamed E. Ouf , Abdel Zaher E.A. Mostafa
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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