INFLUENCE OF USING A VARIOUS PERCENTAGES OF RECLAIMED ASPHALT CONCRETE PAVEMENT ON PROPERTIES OF MIXTURE ASPHALT (UNMODIFY ASPHALT AND MODIFY ASPHALT)

Abstract

In general, because of the constant depletion of natural resources in Iraq, there was a need to numerous studies that may lead to reduce the use of these resources through reuse recycling process which could lead to reduced costs and preservation of the environment. It is possible to use additives such as reclaimed rubber (RR) to improve the performance and extend service life and reduce early distress. The main purpose of this study was to study the effect of using the Reclaimed Asphalt Pavement (RAP) and also study the effect of using the additive (RR) on the asphalt mixture properties and determine the optimum ratio of the (RAP) to achieve the objective of the study. In practical part was used different percentages of (RAP) is (10%, 20%, 30%, 40%, 50%) by weight of aggregate when preparing models process as well as using the additive (RR) and rate (15%), depending on a previous study. The performance of asphalt mixtures is evaluated by using Marshall test and indirect tensile test the results were compared with using different percentages of (RAP). Results of the study, we can say that the use of (% 20RAP) as a maximum percentage in unmodify asphalt mixtur course the specifications requirements of the surface layer, but it's best to use the percentage (10%RAP) in order to ensure better performance, when use a modified asphalt with percentage (%15RR) the increased (RAP) from (20% to 30%) as the percentage of (30%RAP) achieved the specification requirements but preferred to use the ratio of (20%RAP) in order to ensure the degree of better performance for paving.Finally, the study recommended to conduct a large scale experiment to take into consideration more cases of mixing components and conditions..