Abstract:
Recycling application in road maintenance and rehabilitation is of target concern for many
developing countries as they focus on minimizing the cost due to budget constraint allocated to
the sector of road infrastructure, as well as to give response to environmental concern in a way of
reducing the disposal or land fill because pavement rehabilitation and reconstruction give big
amount of quantities of Reclaimed Asphalt Pavement (Jie, 2011). Moreover, in a world where
more and more focus are being made on resources especially materials, the use of locally
pavement materials such as sawdust ash and cement has been thought also to offer the suitable
solution to the stabilization of RAP. The use of sawdust ash and cement for stabilizing the
reclaimed asphalt has manifested a strong bond between them due to their similarity in terms of
cementitious behavior to provide the performance to the mix for the surface course application.
This study provides different results and performance of the RAP materials associated with
sawdust ash to improve for pavement through their effect within the mixture. The study will help
in improving the performance of the pavement by utilizing the sawdust ash and cement in asphalt
mixture, and evaluate the behavior of it through marshal test, a part from the pavement
performance also this study will contribute to the environmental impact by minimizing the
disposal of waste materials. This study evaluates the effect of sawdust ash as the filler
replacement by 100%; 70%; 50%; 30% and 0% in the asphalt mix and reclaimed aggregate that
showed the good performance in terms of flow and stability test conducted in laboratory as
ordinary filler retained on sieve 75μm. The results obtained lied between the range of 8.5 as
maximum at 5% bitumen and 3.5mm for the flow, the results are in acceptable recommendation
according to (TMH14,1985). The processes that the research focus on, is the effect of sawdust
and cement in the asphalt composed of aggregates and bitumen in terms of flow and stability for
the mix.
