Partial Replacement of Reclaimed Asphalt Pavement, (RAP) and Extracted Binder in HMA Using Marshal Method

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Addis Ababa University


The shortage of road construction materials and supplies along with the increase in processing and hauling cost has encouraged the use of Reclaimed Asphalt Pavement (RAP) materials in hot mix asphalt (HMA). The use of RAP is becoming a common practice around the world and involved a regular improvement in various countries. RAP has only limited application in Ethiopia. The aim of this study is to evaluate the effect of RAP in HMA in the form of Solid aggregate weight and extracted binder using Marshall Method based on laboratory experiment by applying Direct and Extracted RAP methods. The binder was extracted by using Trichloroethylene to separate the bitumen and the aggregate. Marshall Mix design is used for the analysis based on 0%, 15%, 25%, 35% and 45% of RAP by weight of the mix. Nine mixes were tested; four RAP materials without extraction, four extracted aggregate with RAP binder and recovered RAP binder one Control/Virgin Mixes. Each mix has been tested on four different percentages of RAP 15%, 25%, 35% and 45%. The Marshal Test result in both methods indicates that when the RAP percentage increases the Air voids, Stability, VMA and VFA increase accordingly. On the other hand, the Bulk Density, Dust to binder Ratio and flow decrease. Based on laboratory results as well as Marshal Criteria properties and performance, it has been recommended it is possible to reuse the RAP up to 45% with improved performance as compared to control /virgin mix In addition by using both methods it was justified that all RAP mixtures results found to be adequate and meets the minimum requirements as per MS-2 Criteria.



Reclaimed Asphalt Pavement, (RAP), Extracted binder, Marshal Method, HMA