Abstract
In this study, we aimed to develop an image analysis method for evaluating the fracture surfaces of concrete-epoxy interfaces (CEI). CEI is formed when an externally-bonded fiber-reinforced polymer (FRP) system, which is considerably influenced by environmental and loading conditions in service, is applied. CEI debonding failure is characterized into one of three possible modes: cohesive failure in the concrete (CC), interfacial failure (IF), and cohesive failure in the epoxy (CE), using the developed image analysis method. Quantitative image analysis with a set of rules for failure mode classification enabled the correlation of the CEI failure mode with bond performance, such as the fracture energy three-point bending specimens and single-lap shear specimens’ peak pull-off force. The results reveal a robust failure mode and bond performance correlation. Extended periods of sustained loading decrease the bond performance and shift the dominant failure mode from CC to IF.
| Original language | English |
|---|---|
| Pages (from-to) | 13-21 |
| Number of pages | 9 |
| Journal | Journal of the Korea Concrete Institute |
| Volume | 34 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Feb 2022 |
Keywords
- Concrete-epoxy interface
- Creep
- Failure mode
- Image analysis
- Temperature