Research Article
Experimental Study on Detection of Deterioration in Concrete Using Infrared Thermography Technique
Table 6
Results of detecting the depth of the defects for the 20-minute heating cycle.
| | Defect | Width-to-depth ratio | Observation time (min) | Absolute contrast (°C) | Actual depth (cm) | Estimated depth (cm) | Error (%) |
| | D1 | 1.00 | — | — | — | — | — | | D2 | 1.67 | 4.0 | 0.27 | 3 | 2.29 | 24 | | D3 | 2.33 | 5.5 | 0.46 | 3 | 2.69 | 10 | | D4 | 3.33 | 3.5 | 1.05 | 3 | 2.15 | 28 | | D5 | 1.50 | 2.5 | 0.42 | 2 | 1.81 | 9 | | D6 | 2.50 | 3.5 | 1.22 | 2 | 2.15 | | | D7 | 3.50 | 2.5 | 1.72 | 2 | 1.81 | | | D8 | 5.00 | 3.5 | 1.92 | 2 | 2.15 | | | D9 | 3.00 | 2.0 | 0.61 | 1 | 1.62 | | | D10 | 5.00 | 2.0 | 1.68 | 1 | 1.62 | | | D11 | 7.00 | 2.0 | 2.12 | 1 | 1.62 | | | D12 | 10.00 | 1.0 | 4.09 | 1 | 1.15 | |
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Note: width-to-depth ratio is calculated using the actual depth of the defects.
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