Evaluation of Asphalt Road Pavement Containing RAP as a partial material in Asphalt Binder Course Mix in Laboratory
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Date
2020-01
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Addis Ababa University
Abstract
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.
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Keywords
Asphalt Binder Course, Hot Mix Asphalt, Performance, Recycled Asphalt Pavement