Implementing Innovative Ideas in Structural Engineering and Project Management Edited by Saha, S., Zhang, Y., Yazdani, S., and Singh, A. Copyright © 2015 ISEC Press ISBN: 978-0-9960437-1-7 INFLUENCE OF NEAR-SURFACE MOUNTED FRP WITH CEMENTITIOUS MATERIAL ON OUT-OF- PLANE BEHAVIOR OF REINFORCED MASONRY WALLS ZUHAIR ALJABERI and JOHN J. MYERS Dept of Civil, Architectural & Environmental Engineering, Missouri University of Science and Technology, Rolla, USA Eight medium scale reinforced masonry walls were built as a part of this study. These reinforced walls were strengthened using carbon fiber reinforced polymer [FRP] (bars and tapes) and glass FRP (bars) using a near surface mounted technique (NSM) with cementitious material; constant mild steel reinforcement ratio (ρ) was used. These strengthened walls were supported as a simply supported wall under an out-of-plane cyclic load applied along two line loads. This study presented the effect of different parameters, these parameters related to FRP (type and amount), bond pattern (stack and running), and existing of FRP in compression face of the walls. This paper reveals the relation between these factors and the out-of-plane capacity of the reinforced wall strengthened with FRP. Different modes of failure occurred in the strengthened reinforced walls, including a punching shear failure through the concrete block, crushing of concrete block and debonding of FRP reinforcement from the masonry substrate. Keywords: Strengthening, Overloading, Fiber reinforced polymer, NSM, Carbon fiber. 1 INTRODUCTION Masonry walls are commonly used throughout the world because they are inexpensive and easily constructed. Many unreinforced masonry (URM) structures are damaged when subjected to overloading, earthquake and wind loads. An effective technique was needed to strengthen reinforced masonry structures against overloading conditions in order to improve both the load carrying capacity and ductility within a masonry wal l. An attractive method for strengthening application is using FRP composites as a near surface mounted (NSM) system. An FRP reinforcement is lightweight and available in multiple forms, many of which could easily be manipulated to match variable structural shapes and geometries (ACI 440.2R-10). The use of epoxy has proven to give excellent performances both in terms of bonding and durability. FRP with epoxy has some drawbacks, poor behavior of the resin at temperatures above the glass transition temperature, emission of toxic fumes, moisture impermeability (Hashemi et al. 2008). Using a cementitious material as an alternative adhesive agent is very attractive and eliminates these drawbacks. This investigation evaluates the behavior of reinforced masonry wall strengthened with FRP composites using cementitious based material.