© 2015 Ahmed Ebrahim Abu El-Maaty and Abdulla Ibrahim Elmohr. This open access article is distributed under a Creative Commons Attribution (CC-BY) 3.0 license. American Journal of Engineering and Applied Sciences Original Research Paper Characterization of Recycled Asphalt Pavement (RAP) for Use in Flexible Pavement 1 Ahmed Ebrahim Abu El-Maaty and 2 Abdulla Ibrahim Elmohr 1 Department of Highways and Airports Engineering, Faculty of Engineering, Menoufia University, Egypt 2 Department of Highways and Airports Engineering, Faculty of Engineering, Alazhar University, Egypt Article history Received: 29-04-2015 Revised: 12-05-2015 Accepted: 10-06-2015 Corresponding Author: Ahmed Ebrahim Abu El-Maaty Department of Highways and Airports Engineering, Menoufia University, Egypt Email: [email protected] Abstract: Due to economical reasons and the need for environmental conservatism, there has been an increasing shift towards the use of Recycled Asphalt Pavement (RAP) materials in the pavement construction industry. The majority of HMA mixtures in Egypt are produced only from virgin materials although there are about 4 million tons per year of reclaimed asphalt materials, due to continuous pavement milling or scraping processes, are not used. High durability potential usually implies that the mechanical behavior of the mixture will endure for a long service life. Now, flexible pavement, made of Hot-Mix Asphalt (HMA) with the addition of the reclaimed asphalt pavement granules in the central asphalt mixing plant, is increasingly used. The main objective of this paper is to investigate the use of a homogeneity reclaimed asphalt pavement in the pavement industry evaluating the effects of partial and total replacements of aggregates by RAP on the mechanical and durability performance of dense-graded HMA mixtures. The performance of RAP mixtures was evaluated through a series of laboratory tests including Marshall test, indirect tensile strength test, granule adhesion test and material test systems. A series of binder mixes containing varying percentages of RAP were designed and subjected to different moisture conditioning periods (1, 3 and 7 days) to investigate the moisture damage effect on RAP mixtures. The laboratory results indicated that when properly designed, the asphalt mixes with RAP especially at 50 to 100% replacement ratio provided better performance compared to those of new conventional HMA mixtures where they minimized the environmental impacts through the reduction of energy consumption, improved the mechanical properties, durability performance and also stripping resistance. Keywords: Recycled Asphalt Pavement, Mechanical Properties, Durability Performance, Tensile Strength, Material Test Systems Introduction The heating of bituminous binder, aggregates and production of huge quantities of Hot Mix Asphalt (HMA) releases a significant amount of green house gases and harmful pollutants. The amount of emissions becomes twofold for every 10°C increase in mix production temperature and increasingly, higher temperature is actually being used for the production of HMA with modified binders. Also, there is a problem of the scarcity of aggregates, which forces transportation of materials from long distance. The use of diesel for running trucks leads to emission of pollutants. Therefore, an attempt has to be made to develop and adopt alternative technologies for road construction and maintenance to reduce consumption of fuel and aggregates (Pradyumna et al., 2013; Vislavicius and Sivilevicius, 2013). Recycling of asphalt pavements is a technology developed to rehabilitate and/or replace pavement structures suffering from permanent deformation and evident structural damage. In this context, according to (Reyes-Ortiz et al., 2012), The Reclaimed Asphalt Pavement (RAP) is one of the most recycled materials in the world. The first data documented on the use of RAP for the construction of new roads date back to 1915. However, the actual development and rise of RAP usage occurred in the 1970’s during the oil crisis, when the cost of the asphalt
Characterization of Recycled Asphalt Pavement (RAP) for Use in Flexible Pavement
Jun 24, 2023
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