Jordan Journal of Civil Engineering

The Role of Scrap Rubber, Asphalt and Manual Compaction against the Quality of Ballast Layer


Dian M. Setiawan; Sri Atmaja P. Rosyidi; Cahyo Budiyantoro;


This research utilizes scrap rubber from outer motorcycle tires and asphalt of 60/70 penetration as a ballast layer mixture component. The objective of this study is to evaluate the characteristics of modified ballast with scrap rubber and asphalt mixtures and with two different numbers of manual compaction through a compressive strength test by analyzing elastic modulus, ballast material durability and vertical deformation. The most prominent finding to emerge from this study is that the more compaction times and the presence of asphalt, the higher the elastic modulus, the lower the ballast material abrasion and the lower the vertical deformation; hence, the stiffer the ballast layer and the higher the ballast durability. Furthermore, the percentage of ballast material abrasion shows a decrease along with the use of scrap rubber and asphalt. However, in the ballast layer with scrap rubber, the presence of 10% of 3/8” scrap rubber will reduce the ballast layer stiffness. Lastly, in the ballast layer with scrap rubber, the compaction works were unable to impact optimally the vertical deformation reduction, since the ballast materials in the sample with scrap rubber tend to bounce off each other, so that the sample does not have sufficient and proper density and stiffness.


60/70 penetration asphalt, Ballast abrasion, Elastic modulus, Manual compaction, Scrap rubber, Vertical deformation