Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/21325
Title: Characterization of flaws embedded in externally bonded CFRP on concrete beams by infrared thermography and shearography
Authors: Lai, WL
Kou, SC
Poon, CS 
Tsang, WF 
Ng, SP
Hung, YY
Keywords: Concrete
Flaws in CFRP strip
Infrared thermography
Laser shearography
Issue Date: 2009
Publisher: Springer/Plenum Publishers
Source: Journal of nondestructive evaluation, 2009, v. 28, no. 1, p. 27-35 How to cite?
Journal: Journal of Nondestructive Evaluation 
Abstract: Carbon fiber-reinforced polymer (CFRP) has become an important material to rehabilitate deteriorating concrete structures. The quality of the bond between the externally-bonded CFRP and concrete elements is crucial to durability and structural integrity of the rehabilitated concrete structure. However, flaws between CFRP and concrete interfaces can reduce the effective contact area significantly and therefore, the overall bond strength at these interfaces. Such flaws are not readily noticed by naked eyes, but can be detected and quantified non-destructively and effectively by using full-field and non-contact infrared thermography (IRT) and laser shearography. Flaw and sound areas presented within the FRP-concrete interfaces manifest very different thermal decay and mechanical fingerprints. In this paper, we report a study which tested, with IRT and shearography, the sizes and shapes of 17 round-shaped and artificial flaws embedded in 6 CFRP-concrete specimens; and then compared the results with the actual flaw sizes and shapes. In general, the results show that IRT underestimated the actual flaw sizes by 6.1% on average, whilst shearography overestimated the actual flaw sizes by 9.4% on average. These results demonstrated that both IRT and shearography are promising non-destructive evaluation techniques that can be used to define flaw boundaries and determine flaw sizes within the CFRP-concrete composites.
URI: http://hdl.handle.net/10397/21325
DOI: 10.1007/s10921-009-0044-x
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

21
Last Week
0
Last month
1
Citations as of Aug 18, 2017

WEB OF SCIENCETM
Citations

16
Last Week
0
Last month
1
Citations as of Aug 12, 2017

Page view(s)

59
Last Week
3
Last month
Checked on Aug 13, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.