The behaviour of structures under projectile and missile fragment attacks have demonstrated that significant damage can be imposed on structures that were designed prior to the enhancement of the modern design provisions of current building codes. Increasing the impact resistance of our infrastructure has gained importance in recent years as a viable terrorist risk mitigation strategy. Among the options considered for retrofitting structures, approach that has been emerging is new technique for retrofitting existing structures. It involves external protection techniques where different types of metallic and non-metallic grids are embedded in mortar fixed to the exterior side of the structures. The main goal of this paper is to evaluate the performance of reinforced concrete structures, surface retrofitted with various non-metallic grids and/or a metallic mesh imbedded in mortar, against different impact loads. Forty square concrete panels were evaluated under different types of tests. Their performance and the impact resistance enhancement were investigated to provide a better understanding of the response of such structures to the effects of impact loads. It is concluded that all retrofitted panels showed a good impact resistance and fragmentation reduction, and the panels retrofitted with a combination of steel mesh and poly-ethylene grid had the highest impact resistance.

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Conference Annual Conference of the Canadian Society for Civil Engineering 2011, CSCE 2011
Majeed, M. (M.), & Halim, A.O. (2011). External protection of reinforced concrete panels subjected to different impact loading. In Proceedings, Annual Conference - Canadian Society for Civil Engineering (pp. 307–316).