A study of full-field debond behaviour and durability of CFRP-concrete composite beams by pulsed infrared thermography (IRT)

Wai Lok Lai, K. K. Lee, S. C. Kou, Chi Sun Poon, W. F. Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)


The methodologies and results of an empirical study on the full-field debonding behaviour of CFRP-strengthened concrete beam composites by pulsed infrared thermography are presented. The study made use of a combined destructive and nondestructive approach carried out simultaneously. From the destructive side, the specimens were destructively and progressively ruptured by a modified pull-out test, and from the nondestructive side, the extent of rupture was revealed and quantified by recording the time-lapsed and dissipated temperature/pixel distributions measured by pulsed infrared thermography (QIRT). The behaviour amongst the IRT-derived extent of rupture and load level were cross-plotted to derive an failure model, which becomes possible when IRT is used. The debonding of the CFRP-concrete composite started from an initial sub-critical (large load increment, small rupture) state to a critical (small load increment, large rupture) state after passing a yield point. The methodology was then repeated to evaluate the durability of 52 CFRP-concrete specimens after they were subjected to accelerated deterioration by moisture intrusion. These results substantiate the validity of the combined nondestructive and destructive approach to test and evaluate the full-field debond behaviour of the composite.
Original languageEnglish
Pages (from-to)112-121
Number of pages10
JournalNDT and E International
Publication statusPublished - 1 Nov 2012


  • Debonding
  • Durability
  • Externally-bonded CFRP and concrete composites
  • Full-field pulsed infrared thermography
  • Pull-out test

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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