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.
Keywords: Reclaimed Asphalt Pavement, sawdust ash, stabilization, stability, flow and
filler.
