Development of New Damping Materials for Trackbed and their Behavior under Mixed Traffic

Damping 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 materials but lower than those of concrete, which makes it more suited for ballastless 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. Two laboratory studies were conducted to investigate the mechanical and viscoelastic properties of CEAM. In the first round of testing the uniaxial compressive strength (UCS), indirect tensile (IDT) strength, dynamic modulus and phase angle, shrinkage, and cement hydration heat were tested for type II (high modulus) CEAM with different asphalt/cement (A/C) ratios. The second round of testing built on the results of the previous work and investigated the mechanical and viscoelastic properties of both type I (low modulus) and type II ( high modulus) CEAM.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 80p

Subject/Index Terms

Filing Info

  • Accession Number: 01599266
  • Record Type: Publication
  • Report/Paper Numbers: NURail2012-UTK-R03
  • Contract Numbers: DTRT12-G-UTC18
  • Files: UTC, TRIS, RITA, ATRI, USDOT
  • Created Date: Apr 26 2016 10:36AM