Conventional ballast is used in conjunction with all these materials. Section 40 has a short section of 50-feet, which was placed to measure the load response of a diamond crossing. Return To Top AI presentation by CE Hensley gave a brief background of the thirty years research by the AI and the reported findings. The mix design and in-place properties of the HMA sections were presented to the group. Provides uniform sub-ballast.
Water proofs the subgrade and stabilizes the in-place moisture content.
Provides a uniform track modulus for the track system. Helps maintain uniform track geometry. Minimizes annual temperature swings of the underlayment. Increases the modulus of ballast by it's keying into the plastic mixture. Reduces ballast wear and fouling.