Abstract
The use of Ultra High-Performance Concrete (UHPC) for repairing damaged structures has been discovered in recent decades. Unique properties of UHPC give superior structural performance for strengthening the existing bridge or slab. The lack of data has been available in code provisions about this strengthening technology, that is why reviewing the experimental studies can guide application. This literature study presented the experimental database with its evaluation for the number of researchers to examine the effectiveness of strengthening bridges or slabs with UHPC. Also, this study discussed the basic parameters which affect the strengthening process directly, including interface preparation, size effect, characteristics of substrate NSC and characteristics of UHPC overlay. Different failure modes of composite structures were identified under flexure. In addition, based on the existing works of literature an estimate equation has been developed to predict the cracking and failure load of strengthening composite structures. The experimental studies evidenced that the UHPC can prolong the life of existing old structures and reduce the cost of maintenance. Finally, some recommendations are suggested for future work to obtain a more accurate result
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