The use of fiber reinforced polymer (FRP) composites has gained amongst scientists, design engineers and practitioners a relevant role for the reinforcement and strengthening of concrete structures, being in several cases more competitive and constituting better alternatives than the application of conventional reinforcing materials according to traditional methods. However, the use of FRPs is still reduced when taking into account the potentialities of these advanced materials. This is due to the relative lack of knowledge regarding their durability, long term behavior, reinforcement effectiveness, design procedures, reliable tests for the characterization of their properties and the behavior of FRP-concrete reinforcing systems, and quality control. Some of the deficiencies attributed to the FRP composites, like their susceptibility to high temperatures and their brittle behavior, can be overcome or attenuated if they are correctly combined with other advanced materials. The use of these composites can also be optimized for the development of innovative structural systems of better durability and structural behavior, longer life cycle and smaller maintenance cost. Cost effective and sound strengthening solutions demand the use of reliable non-destructive techniques that allow the assessment of the material properties and the real behavior of the existing structures. Advanced computer tools capable of simulating with high accuracy the behavior of a strengthened structure, taking into account the damage installed in the existing structure and the intrinsic phase process of a strengthening intervention, are still scarce. New production technologies of FRPs, capable of installing sensors for long-term and reliable assessment of the reinforcement effectiveness and structural performance represents a new challenge, especially if eco-FRP-constituents and self-powered wireless sensors are used for the new generation of smart-materials. The use of natural fibers and recyclable matrices should be explored for the manufacture of more sustainable FRP reinforcing systems. In this context, FRPRCS-11 has the purpose of being a forum for the discussion of the potentialities and challenges of FRP for the reinforcement of concrete structures.

Language
The official language of the Conference is English.