Jordan Journal of Civil Engineering

Subgrade Service Life and Construction Cost of Ballasted, Asphaltic Underlayment, and Combination Rail Track Design




A study that could help the rail track engineer in determine the configuration and thickness design of rail track corresponded to targeted service life and construction budget availability is needed for the benefit of long-term railways development. This paper aims to predict the subgrade service life and calculate the construction cost of ballasted, asphaltic underlayment, and combination rail track. The rail track service life-cost ratio also analyzed in this study. The outputs indicate that the longest subgrade service life and the highest construction cost produced by asphaltic underlayment track, followed by combination and ballasted tracks, respectively. The increase of sub-ballast thicknesses every 5 cm in all granular track only able to improve subgrade service life as much as 20% to 50%. However, the increase asphalt thicknesses every 5 cm in asphaltic underlayment track and in combination track could improve subgrade service life as much as 130% to 190% and 63% to 83%, respectively. Also, the adding of sub-ballast thickness every 5 cm could enhance all granular track construction cost only around 80 million rupiah /kilometer. Nevertheless, the adding of asphalt thickness every 5 cm in asphaltic underlayment and combination track could enhance construction cost up to 500 million rupiah/kilometer.


Asphalt underlayment track, ballast, ballasted track, construction cost, service life, sub-ballast, subgrade