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The aim of this research is the study of the effect of addition of CKD with weight ratios of CKD (0,10,20,30,40,50)pphr on the mechanical properties of rubber composite which consists of the matrix material of Reclaimed rubber and the bond material which is Styrein-Buotaden Rubber (SBR) and these properties include Tensile strength ,Elastic Modules ,Elongation ,Resilience, specific gravity, tear resistance and Hardness The result of comparison between the mechanical properties of the prepared batches, is choosing rubber composite batch ( 80R+20SBR+40 CKD) which has the more compatibility and achieves the mechanical properties, where the addition of CKD will increase the tensile strength, elastic modules and elongation until reaching the ratio 40 CKD in the batch S5. The values of resilience curve for the rubber batch S5 show regular linear dropping, gradual rising in hardness number measured for rubber batch surface ,tear resistance, specific gravity with increasing in the amount of addition materials CKD.

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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..

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