Bonding FRP sheets externally to existing concrete structures to prevent the spalling of concrete is becoming a popular application of FRP technology in Japan. In the paper, a series of experimental studies are performed to observe the failure mechanisms at different peeling stages of FRP sheet-concrete interfaces under dowel ac-tion, and also, to calibrate the interface spalling fracture energy, which can be used for spalling prevention de-sign of concrete structures by using externally bonded FRP sheets. Experimental parameters are concrete strength, stiffness of FRP, properties of adhesives, methods for concrete surface treatment as well as the pre-set initial crack length between FRP sheets and concrete. Analytical models clarifying relationships among peeling angle, interface spalling energy and dowel force capacity are built up. The effects of FRP stiffness, adhesive types, and concrete strength on the interface-peeling angles, interface spalling energy as well as the interface dowel resistance are discussed. Finally, suggestions for optimal spalling prevention design of FRP sheet-concrete interfaces are given.
|Title of host publication||FRP Composites in Civil Engineering-CICE2004|
|Number of pages||10|
|Publication status||Published - 2004|
|Event||The 2nd International Conference on FRP Composites in Civil Engineering - Adelaide, Australia|
Duration: 8 Dec 2004 → 10 Dec 2004
|Conference||The 2nd International Conference on FRP Composites in Civil Engineering|
|Period||8/12/04 → 10/12/04|