Nor Izzah Zainuddin, Shahreena Melati Rhasbudin Shah, Nuraini Tutur, Roziah Keria and Tey Li Sian
Keywords: Modified Bituminous Mixture, Polyethylene, Optimum Bitumen Content, Marshall Test.
Abstract: Modified bituminous mixture helps to enhance the properties of mixture to improve the road performance. The purpose of this study is to determine and to evaluate the properties in comparison to conventional bituminous mix using JKR specification. Low Density Polyethylene (LDPE) and High Density Polyethylene (HDPE) were mix together as additives. Marshall Mix design was used to determine the optimum bitumen content (OBC) and further to test the modified bituminous mixture properties. In total, 60 samples were prepared where 15 samples was used for control sample. The optimum bitumen content for conventional sample is 5.19%. The percentage of polyethylene added are 1.0%, 1.5% and 2.0% where half contribution of LDPE and HDPE for each percent added by weight of aggregate. Both polyethylene used were in granular shape. The tests include the determination of penetration index, Marshall Stability and Flow. The results indicated that the modified bituminous mixture provide better engineering properties which improve the strength, flow, air void and resulted in longer road service performance. In addition, modified bituminous mixture has lower OBC compared to conventional sample and this may reduce the amount of bitumen content in road construction.