Journal
SENSORS
Volume 17, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/s17081718
Keywords
concrete deterioration; active thermal imaging; ambient temperature; relative humidity; infrared thermography; nondestructive testing
Funding
- Regional Development Research Program - Ministry of Land, Infrastructure and Transport of the Korean government [17RDRP-B076564-04]
- Korea Agency for Infrastructure Technology Advancement (KAIA) [118827] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Active thermal imaging is an effective nondestructive technique in the structural health monitoring field, especially for concrete structures not exposed directly to the sun. However, the impact of meteorological factors on the testing results is considerable and should be studied in detail. In this study, the impulse thermography technique with halogen lamps heat sources is used to detect defects in concrete structural components that are not exposed directly to sunlight and not significantly affected by the wind, such as interior bridge box-girders and buildings. To consider the effect of environment, ambient temperature and relative humidity, these factors are investigated in twelve cases of testing on a concrete slab in the laboratory, to minimize the influence of wind. The results showed that the absolute contrast between the defective and sound areas becomes more apparent with an increase of ambient temperature, and it increases at a faster rate with large and shallow delaminations than small and deep delaminations. In addition, the absolute contrast of delamination near the surface might be greater under a highly humid atmosphere. This study indicated that the results obtained from the active thermography technique will be more apparent if the inspection is conducted on a day with high ambient temperature and humidity.
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