Hot Mix Asphalt (HMA) pavements can be used to improve the performance of crossing diamonds and other high dynamic load track segments. HMA underlayments are one method of strengthening track foundations to improve track superstructure performance. Railroads are looking for standardized designs for HMA similar to what is available for ballast section, crossties and rail. Therefore the authors have developed a rational design method and recommended designs for Hot Mix Asphalt (HMA) underlayments at crossing diamonds. A parametric analysis of typical subgrade conditions and mainline railroad loadings was conducted. These results have been compiled into an easy to use table of minimum HMA thickness vs. subgrade strength.

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