Evaluation of Asphalt Road Pavement Containing RAP as a partial material in Asphalt Binder Course Mix in Laboratory

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Addis Ababa University


Asphalt pavements deteriorate with traffic and time. Maintenance and overlaying may solve minor to medium pavement distress problems. When the condition of a pavement becomes badly deteriorated, rehabilitation of the pavement may become an economic and feasible solution. Rehabilitation of a pavement requires removal of pavement surfaces. Currently Addis Ababa city is undertaking various rehabilitation, upgrading, construction of new roads and regular maintenance works for existing road networks, this is basically dependent on the utilization of natural and industrial resources which enables to produce huge amount of recycled asphalt pavement. There is an insignificant effort made for the utilization of this used asphalt pavement produced due to lack of technology and specification. This thesis presents a study into the possibilities of using Recycled Asphalt Pavements (RAP) as an alternative aggregate and bitumen in new asphalt binder course mixtures. Following the determination of the bitumen content, the aggregate gradation of RAP materials, Marshall Stability tests and moisture susceptibility tests were conducted to evaluate the mechanical properties of the asphalt binder mixture containing RAP. Besides, cost-benefit analysis was made to investigate the advantages and disadvantages of partial substitution of RAP as compared to the conventional HMA. The experimental and theoretical results presented in this thesis prove that the asphalt binder course mixtures can be successfully produced using RAP material. Moreover, it was found that Asphalt binder course mixture containing RAP exhibits advantage in terms of cost compared to the conventional HMA.



Asphalt Binder Course, Hot Mix Asphalt, Performance, Recycled Asphalt Pavement