Improvement of Ballast Material with Addition of Waste Tire Rubber
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Date
2020-11
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Addis Ababa University
Abstract
Railway ballasted track is the most common form of construction used in railway transportation due to a
number of reasons. But a lot of problems are associated with a ballasted track. The excessive deformations
and degradations of the ballast, unacceptable differential settlement of track, liquefaction of underlying soft
subgrade soils etc. are some of them. The traffic flow of rail is increasing every year, due to increased
goods and passenger traffic. This in turn, has led to a more rapid degradation of the railway track and high
maintenance cost. Degradation will affect the comfort and safety of the traffic also. Under good track
conditions, where there is supportive sub ballast and a stable subgrade, ballast is the main source of
induced track settlement. To improve ballast material with addition of waste tire rubber physical strength
and shear strength tests were performed. The effect of ballast flying was also studied and it safe velocities
have been found within the limits of the considered ranges of rubber percentages used in the research.
Researches have been carried out to develop new materials with the aim of increasing the service life of the
track. This thesis identifies the use of waste tire rubber as an elastic aggregate, and analyses its effect on
strength, degradation and settlement characteristics of ballast.
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Keywords
Physical test, ballast material, waste tire rubber, ballast flying, PFC 3D 5.0