| Title | Coating Performance on Existing Steel Bridge Superstructures |
|---|---|
| Record ID | 78465 |
| Personal Name Creator |
Liu, R.; Runion, A. |
| Personal Name Contributor |
Jalinoos, Frank; Becker Chip |
| Corporate Creator | SES Group and Associates |
| Corporate Contributor |
United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development |
| Publisher | United States. Department of Transportation. Federal Highway Administration |
| Publication Date | 20200901 |
| Language | English |
| Abstract | This study evaluated the performance of four coating systems applied on chloride-contaminated steel substrates. The purpose of the study was to identify coating systems that can provide extended service life for steel bridges with minimal surface preparation at a much reduced cost. The study helps estimate the amount of chloride contamination coating systems can tolerate without significant premature failure. The chloride contamination levels tested in this study were 0, 20, and 60 μg/cm2 . The coating systems tested were two 3-coat systems (one with inorganic zinc-rich primer and the other with organic zinc-rich primer), a 2-coat system with carbon nanotubes in its zinc-rich primer, and a 1-coat system of high-ratio calcium sulfonate alkyd. Coated panels were exposed to two conditions: accelerated laboratory testing and outdoor natural weathering. The 3-coat systems had the best corrosion protection performance among the tested specimens. The inorganic zinc primer performed slightly better than the organic zinc primer. The 2-coat system demonstrated the highest adhesion strength over all levels of chloride contamination. |
| Rosap ID | dot:51754 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/51754 |
| TRT Terms | Protective coating; Steel bridges; Chlorides; Corrosion |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
1751848 |
| Contract Number | DTFH61-17-D-00017 |
| Report Number | FHWA-HRT-20-065 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/78000/78400/78465/FHWA-HRT-20-065.pdf |
| Alternative URL | https://www.fhwa.dot.gov/publications/research/infrastructure/structures/bridge/20065/20065.pdf |
| Format | |
| Database | NTL Digital Repository |