Table 6 Reduction of amplitude at different ages of concrete compared to normal concrete.
Mud content /% | Ultrasonic amplitude at different concrete ages /dB | Reduced compared to normal concrete /% | ||||
|---|---|---|---|---|---|---|
7d | 14d | 28d | 7d | 14d | 28d | |
0 | 123.42 | 131.99 | 125.17 | 0 | 0 | 0 |
3 | 122.86 | 127.47 | 124.93 | 0.46% | 3.55% | 0.19% |
5 | 123.47 | 125.66 | 121.58 | -0.04% | 5.04% | 2.95% |
10 | 123.45 | 122.2 | 116.97 | -0.02% | 8.02% | 7.01% |
20 | 119.54 | 117.54 | 114.84 | 3.25% | 12.30% | 9.00% |
30 | 116.08 | 114.32 | 112.71 | 6.33% | 15.46% | 11.05% |
40 | 112.74 | 110.45 | 110.59 | 9.48% | 19.51% | 13.18% |
50 | 110.18 | 108.18 | 109.34 | 12.02% | 22.02% | 14.48% |
100 | 106.98 | 104.32 | 106.45 | 15.37% | 26.53% | 17.59% |
