Long-term residual anchorage resistance of gradient anchorages for prestressed CFRP strips
Harmanci, Yunus E.
- Journal Article
This paper presents findings from a series of experimental investigations on the long-term resistance of the gradient anchorage, a purely epoxy-based non-mechanical anchoring technique for prestressed carbon fiber reinforced polymer (CFRP) strips, after exposure to accelerated ageing conditions. A segment of the complete anchorage solution is simulated by anchoring a prestressed CFRP strip to a concrete block. A custom-designed clamping system on one end allows for maintaining the prestress force constant during exposure to accelerated ageing. Upon such an exposure, the specimens are tested in a conventional lap-shear test setup. Several exposure scenarios and their effect on the residual load carrying capacity are considered, namely the effect of carbonated concrete (CC), freeze-thaw cycles (FTC), as well as their combination. Forces and full-field displacements, the latter by means of a 3D-DIC system, were measured during the prestress-force-release and lap-shear tests. Results indicate a higher anchorage resistance for CC compared to the reference specimens. For both groups a debonding in the concrete substrate was observed. Specimens subjected to FTC exposure suffer from a significant reduction in residual anchorage resistance, as well as a shift in failure mode from a concrete substrate dominated to an epoxy/concrete interface failure. The current knowledge on the residual resistance of gradient anchorage has to be adapted accordingly. Show more
Journal / seriesComposites Part B: Engineering
Pages / Article No.
SubjectPrestressed CFRP; Gradient anchorage; Carbonation; Freeze–thaw; Concrete-epoxy interface; Durability; Debonding failure
Organisational unit03890 - Chatzi, Eleni / Chatzi, Eleni
157212 - Long-term Resistance of Gradient Anchorage for Prestressed CFRP Strips in Structural Concrete Retrofitting (SNF)
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