TY - JOUR
T1 - Bond defect detection using PTT IRT in concrete structures strengthened with different CFRP systems
AU - Tashan, Jawdat
AU - Al-Mahaidi, Riadh
PY - 2014
Y1 - 2014
N2 - In the context of increased use of carbon fibre reinforced polymer (CFRP) to strengthen concrete structures, the bonding conditions between CFRP and existing structures are crucial. Recently, infrared thermography (IR) non-destructive testing (NDT) has emerged as a technique for bond detection. This paper reports in detail the detection of different unbond, debonding and delamination areas within the bond zone between single- and multi-layer CFRP and concrete structures. Pulse thermography (PTT) was chosen for the IR tests. Pulse intervals of 1. s, 3. s, and 5. s were used as thermal loading to all specimens and halogen lamps were positioned at different distances from the investigated surfaces. Each IR test involved the analysis of 600 IR images. Thermal responses were recorded to detect and study defect characterizations. The paper recommends the minimum thermal input to generate well-recognized bond defect detection, and the results show that the maximum thermal signal is proportional to the number of CFRP layers.
AB - In the context of increased use of carbon fibre reinforced polymer (CFRP) to strengthen concrete structures, the bonding conditions between CFRP and existing structures are crucial. Recently, infrared thermography (IR) non-destructive testing (NDT) has emerged as a technique for bond detection. This paper reports in detail the detection of different unbond, debonding and delamination areas within the bond zone between single- and multi-layer CFRP and concrete structures. Pulse thermography (PTT) was chosen for the IR tests. Pulse intervals of 1. s, 3. s, and 5. s were used as thermal loading to all specimens and halogen lamps were positioned at different distances from the investigated surfaces. Each IR test involved the analysis of 600 IR images. Thermal responses were recorded to detect and study defect characterizations. The paper recommends the minimum thermal input to generate well-recognized bond defect detection, and the results show that the maximum thermal signal is proportional to the number of CFRP layers.
KW - CFRP
KW - NDT
KW - PTT Infra-Red thermography
UR - http://www.scopus.com/inward/record.url?scp=84896363125&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2013.12.016
DO - 10.1016/j.compstruct.2013.12.016
M3 - Article
AN - SCOPUS:84896363125
SN - 0263-8223
VL - 111
SP - 13
EP - 19
JO - Composite Structures
JF - Composite Structures
IS - 1
ER -