Table 8.
Service lives (years), required for the tensile strength retention to reach 50%, of both epoxy- and PU-based CFRPs in various conditions in the four cities.
| CFRP plates | Media | Strain level (%) | Shanghai 17.0 °C | Tianjin 13.7 °C | Vancouver 10.3 °C | Homer 3.5 °C |
|---|---|---|---|---|---|---|
| Epoxy-based CFRPs | Water | 0 | 46.3 | 57.7 | 72.9 | 118.4 |
| 30% | 20.0 | 24.2 | 29.7 | 45.2 | ||
| 58% | 7.0 | 8.1 | 9.3 | 12.6 | ||
| Seawater | 0 | 32.6 | 40.2 | 50.0 | 78.8 | |
| 30% | 17.2 | 20.8 | 25.3 | 38.2 | ||
| 58% | 5.6 | 6.4 | 7.3 | 9.7 | ||
| PU-based CFRPs | Water | 58% | 13.3 | 15.4 | 17.8 | 24.4 |
| Seawater | 58% | 9.1 | 10.3 | 11.7 | 15.3 |