Effects of crumb rubber size and concentration on Marshall parameters of rubberized asphalt mixture

Authors : Ali ALMUSAWI, Hassan Shuaibu ABDULRAHMAN, Mohammad Razeq SHAKHAN, Bora DOĞAROĞLU

Pages : 1048-1052

View : 21 | Download : 6

Publication Date : 2020-11-13

Article Type : Research Paper

Abstract :The depletion of natural aggregate sources which generally accounts for a huge percent of Hot Mixed Asphalts insert ignore into journalissuearticles values(HMAs); and the difficulty posed by disposal scrap tires are a major environmental concern for the future. The use of waste products like scrap tires in highway construction is considered a sustainable way of dealing with these issues. Crumb rubber is a material pulverized from waste polymer products like scrap tires which are then added to HMAs to improve their performance. This study focuses on the sensitivity of crumb rubber particle sizes insert ignore into journalissuearticles values(fine ≤1.18 mm);, insert ignore into journalissuearticles values(coarse ≥1.18 mm and ≤3.35 mm); insert ignore into journalissuearticles values(and mix of 50% fine and 50% coarse); and partial replacement insert ignore into journalissuearticles values(1.5 and 2.5% of total weight); of aggregates on the Marshall test parameters of rubberized asphalt mixes. The Marshall test parameters: density, stability, VTM, VFB of both rubberized asphalt and conventional asphalt samples were compared and also the Asphalt Institute insert ignore into journalissuearticles values(AI); and National Asphalt Pavement Association insert ignore into journalissuearticles values(NAPA); methods were used to obtain the optimum bitumen content insert ignore into journalissuearticles values(OBC);. From the results, it suggests that; the utilization of dry process methodology of adding crumb rubber additives in different sizes and percentages had a considerable effect on Marshal test parameters and also influences the optimum binder content estimates. The results of this study can be used as a reference point for the use of crumb rubber in HMAs.
Keywords : Crumb rubber, Marshall, Optimum bitumen content, Rubberized asphalt