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52550
  
  

  5
Sep
2018
Technical Reports
Inspection of Concrete Ties Using Sonic/Ultrasonic Impact Velocity and Impact Echo Measurements
Author
          Federal Railroad Administration

Subject
                    Testing

**Keywords:** Concrete, crossties, ties, Rayleigh waves, impact echo, impact velocity
**Abstract:** This report documents NDT Corporation’s development of a non-destructive system for inspecting the internal condition of concrete crossties using sonic/ultrasonic impact velocity...
Report Number
              DOT/FRA/ORD-18/32

  Office
              RDI-21
    21
Aug
2018
Technical Reports
Material and Manufacturing Requirements for Freeze-Thaw Durable Concrete Railroad Ties:  Volume I
Author
          Federal Railroad Administration

Subject
                    Testing

**Keywords:** Concrete consolidation, air void system, freeze-thaw durability, concrete crosstie
**Abstract:** This research program was conducted as a partnership between the University of Illinois at Urbana-Champaign (UIUC), Kansas State University (KSU), and the Illinois Department of...
Report Number
              DOT/FRA/ORD-18/31

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