Ultra-high performance fiber-reinforced concrete (UHPFRC) has emerged as one of the promising materials for strengthening of concrete structures. For the strengthening application of UHPFRC, one of the primary concerns is to evaluate the degradation of bond behavior and structural re-sponse of strengthened elements under harsh environmental conditions. Therefore, an experi-mental program has been carried out to investigate the interfacial behavior between UHPFRC and normal concrete, as well as the shear performance of UHPFRC-concrete hybrid beams subjected to combined freeze-thaw cycles and mechanical load. In this study, two groups of shear-deficient reinforced concrete beams were first strengthened by UHPFRC precast panels using epoxy resin. Then, the specimens subjected to 0 and 30 freeze-thaw cycles were loaded to failure under three-point bending. The results indicate that the utilization of epoxy resin is an effective bonding tech-nique to ensure the integral performance of the composite beams and the shear capacity is greatly enhanced with the application of UHPFRC. In addition, it is observed that the effect of applied freeze-thaw regime on the UHPFRC-concrete interfacial bond strength and shear resistance of unstrengthened and strengthened beams is negligible.
|Title of host publication||Proceedings of the 14th fib PhD Symposium in Civil Engineering|
|Editors||Marco di Prisco, Alberto Meda, Gyorgy L. Balazs|
|Place of Publication||Rome, Italy|
|Publisher||fib. The International Federation for Structural Concrete|
|Number of pages||8|
|Publication status||Published - 2022|
|Event||14th fib International PhD Symposium in Civil Engineering - Rome, Italy|
Duration: 5 Sep 2022 → 7 Sep 2022
|Conference||14th fib International PhD Symposium in Civil Engineering|
|Period||5/09/22 → 7/09/22|
Bibliographical noteGreen Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.