| Title | Laboratory and Test-Site Testing of Moisture-Cured Urethanes on Steel in Salt-Rich Environment |
|---|---|
| Record ID | 11588 |
| Personal Name Creator |
Chong, Shuang-Ling; Yao, Yuan |
| Corporate Creator | United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development |
| Publisher | United States. Federal Highway Administration |
| Publication Date | 20001200 |
| Language | English |
| Abstract | Three 3-coat moisture-cured (MC) urethane commercial products formulated for protecting new steel (SSPC-SP 10) and power tool-cleaned steel (SSPC-SP 3) surfaces against corrosion were evaluated; the total coating film thickness was about 75 microns. Zinc-rich MC-urethane primers were used for SSPC-SP 10 steel surfaces whereas the primers for SSPC-SP 3 surfaces contained zero or a small amount of zinc; the same midcoats and topcoats were used for both steel surfaces. A chloride concentration of 20 micrograms per sq cm on the steel surfaces was found to be significant to reduce the coating performance at the scribe of SSPC-SP 10 steel surfaces; however, the chloride effect was found to be minimal for SSPC-SP 3 steel surfaces. Interestingly, all the scribe creepages increased linearly with the laboratory test time up to 4,000 h. Furthermore, the addition of a sealer to the primer/midcoat/topcoat systems unexpectedly impaired the performance at the scribe on SSPC-SP 3 steel surfaces when compared with those systems without a sealer. On the other hand, a coating system with sealer/primer/topcoat without a midcoat developed severe underfilm corrosion probably due to insufficient film thickness. |
| Rosap ID | dot:14703 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/14703 |
| TRT Terms | Laboratory tests; Coatings; Maintenance; Pavements; Pavement performance; Testing; Seal coating; Protective coatings; Paint; Pigments; Urethane; Micaceous soils; Iron oxides; Zinc; Zinc coatings; Corrosion |
| General Subjects | Cost effectiveness |
| Classification | NTL - HIGHWAY/ROAD TRANSPORTATION - Materials |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
806909 |
| Report Number | FHWA-RD-00-156 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/11000/11500/11588/009914.pdf |
| Alternative URL | https://ntlrepository.blob.core.windows.net/lib/11000/11500/11588/PB2001104848.pdf |
| Format | |
| Database | NTL Digital Repository |