Effects of ambient temperature and relative humidity on subsurface defect detection in concrete structures by active thermal imaging

Quang Huy Tran, Dongyeob Han, Choonghyun Kang, Achintya Haldar, Jungwon Huh

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Article number1718
JournalSensors (Switzerland)
Volume17
Issue number8
DOIs
StatePublished - Aug 1 2017

Fingerprint

concrete structures
Infrared imaging
Humidity
Delamination
Concrete construction
ambient temperature
humidity
Atmospheric humidity
Hot Temperature
Temperature
defects
girders
Meteorological Concepts
Interiors (building)
Halogens
Concrete slabs
structural health monitoring
Beams and girders
Sunlight
Structural health monitoring

Keywords

  • Active thermal imaging
  • Ambient temperature
  • Concrete deterioration
  • Infrared thermography
  • Nondestructive testing
  • Relative humidity

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Electrical and Electronic Engineering

Cite this

Effects of ambient temperature and relative humidity on subsurface defect detection in concrete structures by active thermal imaging. / Tran, Quang Huy; Han, Dongyeob; Kang, Choonghyun; Haldar, Achintya; Huh, Jungwon.

In: Sensors (Switzerland), Vol. 17, No. 8, 1718, 01.08.2017.

Research output: Contribution to journalArticle

@article{3e2643c4f3e34224b65d8dd2d13ece05,
title = "Effects of ambient temperature and relative humidity on subsurface defect detection in concrete structures by active thermal imaging",
abstract = "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.",
keywords = "Active thermal imaging, Ambient temperature, Concrete deterioration, Infrared thermography, Nondestructive testing, Relative humidity",
author = "Tran, {Quang Huy} and Dongyeob Han and Choonghyun Kang and Achintya Haldar and Jungwon Huh",
year = "2017",
month = "8",
day = "1",
doi = "10.3390/s17081718",
language = "English (US)",
volume = "17",
journal = "Sensors",
issn = "1424-8220",
publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",
number = "8",

}

TY - JOUR

T1 - Effects of ambient temperature and relative humidity on subsurface defect detection in concrete structures by active thermal imaging

AU - Tran, Quang Huy

AU - Han, Dongyeob

AU - Kang, Choonghyun

AU - Haldar, Achintya

AU - Huh, Jungwon

PY - 2017/8/1

Y1 - 2017/8/1

N2 - 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.

AB - 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.

KW - Active thermal imaging

KW - Ambient temperature

KW - Concrete deterioration

KW - Infrared thermography

KW - Nondestructive testing

KW - Relative humidity

UR - http://www.scopus.com/inward/record.url?scp=85026349793&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85026349793&partnerID=8YFLogxK

U2 - 10.3390/s17081718

DO - 10.3390/s17081718

M3 - Article

C2 - 28933762

AN - SCOPUS:85026349793

VL - 17

JO - Sensors

JF - Sensors

SN - 1424-8220

IS - 8

M1 - 1718

ER -