Strengthening of Existing Structures with UHPFRC: Concrete-To-UHPFRC Interfaces

Andreas Lampropoulos, Ourania Tsioulou, Demetris Nicolaides, Michael F. Petrou

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNChapterpeer-review


Ultra High Performance Fiber Reinforced Concrete (UHPFRC) is characterized by considerably enhanced tensile and compressive strength and significantly improved energy absorption in the post-cracking region. The application of UHPFRC for the strengthening of existing reinforced concrete beams and/or columns is a well promising technique taking into consideration the superior mechanical properties and the durability of the material. However, the connection between the old and the new concrete is always a crucial parameter for the performance of the strengthened elements since failure at the interface and de-bonding of the new layer or jacket is the most common failure type in case of elements strengthened with this technique. One of the most important parameters for the application of the technique is the preparation of the surface and the evaluation of the bond strength between UHPFRC and concrete. In the present study the results of an extensive experimental program on the evaluation of the behavior of concrete-to-UHPFRC interfaces are presented. Various interface types have been examined with different roughness degrees and the shear stress-slip characteristics have been evaluated.
Original languageEnglish
Title of host publicationBuilding for the Future: Durable, Sustainable, Resilient
Subtitle of host publicationProceedings of the fib Symposium 2023 - Volume 2
EditorsAlper Ilki, Derya Çavunt, Yavuz Selim Çavunt
Number of pages11
ISBN (Electronic)9783031325113
ISBN (Print)9783031325106
Publication statusPublished - 1 Jun 2023

Publication series

NameLecture Notes in Civil Engineering


  • Interfaces
  • Push-off tests
  • Strengthening


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