Investigation of material improvements to mitigate the abrasive wear mechanism of concrete crosstie rail seat deterioration (RSD).

Details

• Creators:
  Edwards, J. Riley ; Lange, David A.
• Corporate Creators:
  NEXTRANS Center (U.S.)
• Corporate Contributors:
  United States. Dept. of Transportation. Research and Innovative Technology Administration
• Subject/TRT Terms:
  Abrasion Admixtures Concrete Ties Deterioration Fine Aggregates Mix Design Service Life Tie Pads
• Publication/ Report Number:
  NEXTRANS Project 0931Y04
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  NEXTRANS Center (U.S.)
• Abstract:
  To meet the increasingly stringent design and performance requirements due to increasing cumulative
  
  gross tonnages from heavy-haul freight operations, along with increased high-speed inter-city passenger
  
  rail development, improvements in concrete crosstie designs are needed. Rail Seat Deterioration (RSD)
  
  continues to be identified as one of the primary factors limiting concrete crosstie service life in North
  
  America. RSD refers to the degradation of material at the contact interface between the concrete
  
  crosstie rail seat and the rail pad that protects the bearing area of the crosstie. Industry experts
  
  consider abrasion to be a viable mechanism leading to RSD. A lack of understanding of the complex
  
  interactions affecting the severity of abrasion has resulted in an iterative design process for concrete
  
  crossties and fastening systems. The objective of this study is to quantify the abrasion performance of
  
  rail seats by using a variety of concrete admixtures and materials. To simulate the abrasive wear
  
  mechanism of RSD, a Small-Scale Abrasion Resistance Test (SSART) was designed by researchers at UIUC.
  
  Additionally, a theoretical framework to model and predict abrasive wear was developed using
  
  statistical techniques. Data obtained from the SSART and the statistical model will help the rail industry
  
  mechanistically design concrete crossties by improving the current understanding of the performance of
  
  concrete crosstie mix designs. Preliminary results show that the addition of metallic fine aggregates
  
  (MFA), steel fibers, and the application of coatings improve the abrasion resistance of concrete
  
  specimens
  
  
• Format:
  PDF
• Funding:
  DTRT07-G-005
• Collection(s):
  University Transportation Centers US Transportation Collection
• Main Document Checksum:
  urn:sha256:a3318715880b32a515f29f0aa6f1cb67c1867b1f896bf0978a158abe90f9cc26
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28198/dot_28198_DS1.pdf
• File Type:
  [PDF - 709.70 KB ]