Research Article
Development of a Nondestructive Impulse Device and Damage Model for Unreinforced Concrete
Table 2
Frequency divided by initial frequency.
| Mix | / |
| Low strength | 89.11% | Low/medium strength | 90.36% | Medium strength 1 | 90.13% | Medium/high strength | 92.53% | High strength | 93.30% |
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