Development of New Damping Materials for Trackbed and Their Behavior Under Mixed Traffic

016300992015Final ReportNURail Project ID: NURail2012-UTK-R03PDFTech ReportDTRT12-G-UTC18CementEmulsified asphaltMortarMechanical propertiesElasticity (Mechanics)Damping (Engineering)MicrostructureCement hydrationService (pavements)ViscousnessUnited StatesTennesseeUniversity of Tennessee, KnoxvilleNational University Rail Center (NURail)Huang, BaoshanBurdette, Edwin G.Shu, XiangClarke, David B.University of Tennessee, Knoxville. Center for Transportation ResearchUniversity of Tennessee. Dept. of Civil and Environmental EngineeringNational University Rail Center (NURail)Rutherford, TylerUS Transportation CollectionDamping is a critical factor for the safe operation of passenger and freight shared track railway. Currently, three types of material are commonly used to provide the damping: (1) asphalt trackbed; (2) crumb rubber modified asphalt; (3) cement emulsified asphalt mortar (CEAM). CEAM possesses higher strength and modulus than asphalt mater ials but lower than those of concrete, which makes it more suited for ballast less railway construction than other materials. In Japan, China, and Europe, CEAM has been widely used in high-speed rail (HSR). However, little research has been conducted on CEAM in the U.S