MSE wall void repair effect on corrosion of reinforcement - phase 2 : specialty fill materials.

Details

• Creators:
  Paz, Enrique A. ; Sagüés, Alberto A.
• Corporate Creators:
  University of South Florida. Dept. of Civil and Environmental Engineering
• Corporate Contributors:
  Florida. Dept. of Transportation
• Subject/TRT Terms:
  Corrosion Protection Durability Earth Walls Fillers (Materials) Polyurethane Foams Recommendations Reinforcement (Engineering) Soil Stabilization
• Publication/ Report Number:
  BDV25-977-07
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  University of South Florida. Dept. of Civil and Environmental Engineering
• Abstract:
  This project provided information and recommendations for material selection for best
  
  corrosion control of reinforcement in mechanically stabilized earth (MSE) walls with void repairs. The
  
  investigation consisted of small- and large-scale experiments and modeling to examine corrosion
  
  aggravation effects and conduct durability projections. Regular cement-based controlled low-strength
  
  material (CLSM) was tested, along with slag-based CLSM, MgO-based CLSM, and polyurethane foam
  
  filler. Laboratory experiments indicated that macrocell coupling could substantially increase the corrosion
  
  of the galvanized coating in the backfill side of a void repair with CLSM based on cement or on slag. The
  
  modestly lower pH of the latter did not appear to be a sufficiently beneficial factor in lowering the extent
  
  of adverse macrocell action. CLSM based on MgO, although having a pH closer to neutral, still resulted
  
  in significant adverse macrocell corrosion development. Experiments with the polyurethane foam void
  
  fill confirmed the expectation of much lower tendency for macrocell aggravation of corrosion in the backfill
  
  side. Performance modeling projections quantified the amount of corrosion-related MSE wall
  
  degradation that may be expected as the structure ages. It is recommended that the performance model
  
  projections be analyzed via structural considerations for choice of representative limit state to establish
  
  to what extent a transition to an alternative void filler material is desirable. The use of polyurethane foam
  
  is recommended for further consideration, with additional evaluation of corrosion performance of
  
  reinforcement in that medium.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:ebc427ebf610fb8e94b258be9bb7dd44ff2599be98e030d94d2d5156842cc1c8
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29215/dot_29215_DS1.pdf
• File Type:
  [PDF - 5.08 MB ]