Research Article
Corrosion Investigation of Rock Anchors Served over 10 Years in Underground Powerhouse of a Hydropower Station
Table 8
Description of corrosion ratings of the anchor head structures.
| Rating | Rating standard |
| 0 | No rust or cannot find rust | 1 | Slight rust, local rust spots on the surface | 2 | Obvious rust, rust spots on the whole surface | 3 | Severe rust, with uneven surface because of rust | 4 | Severe rust, with layered or peeling rust products |
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