The effect of sawdust ASH and cement stabilization in the asphalt mixture composed of reclaimed ASPHALT Pavement

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