Partial Replacement Of Reclaimed Asphalt Pavement (rap) And Extracted Binder In Hma Using Marshal Method

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The shortage of road construction materials and supplies along with the increase in processing rnand hauling cost has encouraged the use of Reclaimed Asphalt Pavement (RAP) materials in hotrnmix asphalt (HMA). The use of RAP is becoming a common practice around the world andrninvolved a regular improvement in various countries. RAP has only limited application inrnEthiopia. rnThe aim of this study is to evaluate the effect of RAP in HMA in the form of Solid aggregaternweight and extracted binder using Marshall Method based on laboratory experiment by applyingrnDirect and Extracted RAP methods. The binder was extracted by using Trichloroethylene to rnseparate the bitumen and the aggregate. Marshall Mix design is used for the analysis based onrn0%, 15%, 25%, 35% and 45% of RAP by weight of the mix. Nine mixes were tested; four RAPrnmaterials without extraction, four extracted aggregate with RAP binder and recovered RAPrnbinder one Control/Virgin Mixes. Each mix has been tested on four different percentages of RAPrn15%, 25%, 35% and 45%. rn The Marshal Test result in both methods indicates that when the RAP percentage increases thernAir voids, Stability, VMA and VFA increase accordingly. On the other hand, the Bulk Density,rnDust to binder Ratio and flow decrease. Based on laboratory results as well as Marshal Criteriarnproperties and performance, it has been recommended it is possible to reuse the RAP up to 45%rnwith improved performance as compared to control /virgin mix In addition by using bothrnmethods it was justified that all RAP mixtures results found to be adequate and meets thernminimum requirements as per MS-2 Criteria.

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Partial Replacement Of Reclaimed Asphalt Pavement (rap) And Extracted Binder In Hma Using Marshal Method

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