Diffusion vs. concentration of chloride ions in concrete : [summary].

Details

• Creators:
  Presuel-Moreno, Francisco
• Corporate Creators:
  Florida Atlantic University
• Subject/TRT Terms:
  Bridge Substructures Cement Chlorides Concentration (Chemistry) Durability Ions Reinforced Concrete Seawater Thermal Diffusion Underwater Structures
• Publication/ Report Number:
  BDK79-977-03
• Resource Type:
  Brief
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation
• Abstract:
  The Florida Department of Transportation
  
  (FDOT) maintains hundreds of bridges, and also
  
  builds new ones, in marine environments. These
  
  structures are built with reinforced steel, and
  
  over time, chloride ions from sea salt can migrate
  
  through concrete to attack reinforcing steel.
  
  FDOT has adopted
  
  concrete formulas
  
  and structure
  
  designs intended to
  
  delay this process
  
  and give marine
  
  bridges a 75-year
  
  service life.
  
  In this project,
  
  Florida Atlantic
  
  University
  
  researchers
  
  examined
  
  reinforced concrete
  
  specimens exposed for up to two years to various
  
  seawater and salt conditions. They simulated
  
  exposure of bridge components to continual
  
  immersion as if underwater, cyclic immersion as in
  
  the tidal zone, and lesser exposure of the splash
  
  zone. They also investigated the effects of salt
  
  spray on reinforced concrete not directly exposed
  
  to seawater and thus not saturated; in that case,
  
  high humidity or rain may provide the moisture
  
  that gives the ions mobility. Samples exposed for
  
  over 18 years were also part of this investigation.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:bb7f13b491a9a3a9f7ba9a35d0b23a3d8df308a6b59dd2c88e8e9867fa566daf
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27340/dot_27340_DS1.pdf
• File Type:
  [PDF - 1.59 MB ]