Effect of reclaimed asphalt pavement in granular base layers on predicted pavement performance in Egypt
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TECHNICAL PAPER
Effect of reclaimed asphalt pavement in granular base layers on predicted pavement performance in Egypt Eman Mousa2,3 · Sherif El‑Badawy3 · Abdelhalim Azam1,3 Received: 21 January 2020 / Accepted: 6 May 2020 © Springer Nature Switzerland AG 2020
Abstract This research presents the prediction of pavement performance constructed with base layer consisting of reclaimed asphalt pavement (RAP)/virgin aggregate blends. The prediction was made by the Multi-Layer Elastic Analysis software (KENLAYER) in terms of horizontal tensile strain at the bottom of AC layer and the vertical resilient strain at critical locations within the pavement system. The dynamic modulus |E*| for the hot mix asphalt was estimated by using the quality-related specifications software considering three different climatic conditions and two levels of design speeds. Finally, total pavement rutting and fatigue cracking were determined using the critical strains computed by the Multi-Layer Elastic Analysis along with the Mechanistic Empirical Pavement Design Guide performance models and transfer functions. In general, the RAP blends showed superior/comparable performance compared to natural aggregates for the application in base/subbase layers for the Egyptian conditions. The effect of the rate of loading and climate conditions was significant on both asphalt concrete layer fatigue cracking and rutting. Keywords Reclaimed asphalt pavement (RAP) · QRSS · MEPDG · Performance · Rutting · Fatigue
Introduction Pavement structures are subjected to different levels of traffic loading with variable speeds and environmental changes that may lead to various distresses. Pavement performance mainly relies on material properties, traffic levels, climate conditions, and construction quality [1]. The mechanical properties of the unbound granular materials (UGMs) are affected by material type and its characteristics along with moisture content variations, which depend on the climate condition. * Abdelhalim Azam [email protected]; [email protected]
Eman Mousa [email protected]; [email protected]
Sherif El‑Badawy [email protected] 1
College of Engineering, Jouf University, Sakakah, Kingdom of Saudi Arabia
2
Civil Engineering Department, Horus University, Dumyat Al Jadidah 34511, Egypt
3
Public Works Engineering Department, Mansoura University, Mansoura 35516, Egypt
In recent years, the waste materials have received more attention from researchers and practitioners worldwide. The interest in these materials was necessitated by the population growth, which led to large consumption of natural resources. Thus, the use of recycled materials appeared promising from a wide variety of viewpoints, which increases the awareness to a greener environment. The waste materials include a wide range of excavated materials such as rock, soil, reclaimed asphalt pavement (RAP), bricks, concrete, plastic wastes, scrap tires, foundry sand, oil sand marble dust, and steel slag [2–4]. A great deal of research effort has been performed in
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