Research Article
Nondestructive Testing of Advanced Concrete Structure during Lifetime
| | Days | | | |
| Impact echo frequency [kHz] | 2 | 3.7 kHz | 0.0128 h−1 | 5.9 kHz | 6 | 3.0 kHz | 0.0164 h−1 | 7.4 kHz | 28 | 3.4 kHz | 0.0278 h−1 | 8.4 kHz |
| Ultrasound velocity [mm⋅μs−1] | 2 | 1.7 mm⋅μs−1 | 0.0128 h−1 | 2.0 mm⋅μs−1 | 6 | 1.4 mm⋅μs−1 | 0.0127 h−1 | 2.5 mm⋅μs−1 | 28 | 1.0 mm⋅μs−1 | 0.0105 h−1 | 3.0 mm⋅μs−1 |
| Relative loss in weight (the first 48 h) [%] | 2 | 2.9% | 0.0446 h−1 | 4.3% | 6 | 2.6% | 0.0348 h−1 | 5.0% | 28 | 2.1% | 0.0275 h−1 | 7.4% |
| Relative loss in weight (after 48 h) [%] | 2 | 3.0% | 0.0095 h−1 | 2.8% | 6 | 2.7% | 0.0090 h−1 | 3.8% | 28 | 2.3% | 0.0064 h−1 | 6.5% |
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