Research Article
Comparison of Compressive Strength of M30 Grade Concrete with Destructive and Nondestructive Procedures Using Digital Image Processing as a Technique
Table 2
Comparison of compressive strength obtained by destructive and nondestructive tests.
| Sample no. | No. of days of curing | Compressive strength by CTM (in N/mm2) | Rebound hammer | Ultrasonic pulse velocity test | Compressive strength as per the SonReb method | Image analysis | fck in N/mm2 | RN | fck in N/mm2 | Velocity (m/s) | fck in N/mm2 | fck in N/mm2 |
| 1 | 7 days | 20.444 | 21 | 14.5 | 4545.5 | 21.72 | 22.95 | 2 | 7 days | 17.778 | 20 | 14.0 | 4622.5 | 21.27 | 16.90 | 3 | 7 days | 19.555 | 20 | 14.0 | 4713.5 | 22.25 | 19.49514 | 4 | 7 days | 19.111 | 21.5 | 16.5 | 4651.5 | 23.56 | 18.82616 | 5 | 7 days | 18.889 | 23.5 | 18.5 | 4587 | 25.41 | 17.96898 | 6 | 7 days | 19.555 | 24 | 19.5 | 4492 | 24.84 | 25.56 |
| | Average | 19.222 | | 16.166 | | 23.175 | 20.28 | 7 | 28 days | 32.444 | 30.5 | 29.00 | 4833.5 | 39.36 | 27.26081 | 8 | 28 days | 36.889 | 30.0 | 28.00 | 4792 | 37.81 | 32.54504 | 9 | 28 days | 28.444 | 25.50 | 22.50 | 4870 | 32.20 | 26.6878 | 10 | 28 days | 37.7778 | 24.00 | 19.50 | 4818 | 29.19 | 33.91921 | 11 | 28 days | 39.111 | 27.00 | 24.00 | 4757 | 32.70 | 34.9321 | 12 | 28 days | 31.111 | 27.50 | 25.00 | 4788 | 33.95 | 31.1603 | | Average | 34.298 | | 24.40 | | 34.20 | 31.08 |
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fck = compressive strength of concrete in N/mm 2. |