CORROSION OF GALVANIZED METAL CULVERTS

Corrosion is a major factor in the life expectancy of metal culvert structures. Corrosion resistance, therefore, is of special interest to the user of galvanized culverts. A thorough investigation was conducted on 287 galvanized culverts located on the 56-mile (90-km) route of I-95 in the Upper Peninsula of Michigan. The service life of the culverts inspected ranged from 10 to 14 years. Visual observations and electrical tests were made at the culvert site to define the degree of corrosiveness. Water and soil were sampled and chemically analyzed to determine their relationship to or influence on deterioration. Significant corrosive attack was noted in 39 culverts. Tests results revealed that major deterioration was occuring from the exterior (soil side) of the culvert. Exposure conditions found to cause excessive deterioation in uncoated galvanized culverts are dissimilar soil contacts, presence of organic soils, and differentials in aeration and soil moisture. Sulfates and chlorides were contributing factors to the excessive culvert deterioration as was biological corrosion in the form of sulfate-reducing bacteria.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 38-49
  • Monograph Title: Corrosion, concrete, quality control and paint beads
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00126831
  • Record Type: Publication
  • ISBN: 0309023904
  • Files: TRIS, TRB
  • Created Date: Dec 16 1975 12:00AM