Abstract
Fiber-reinforced polymer reinforcement or polyurea reinforcement techniques are applied to strengthen unreinforced masonry walls (UMWs). The purpose of this experimental study is to verify the out-of-plane reinforcing effect of sprayed glass fiber-reinforced polyurea (GFRPU), which is a composite elastomer made of polyurea and milled glass fibers on UMW. The out-of-plane strengths and ductile behaviors based on various coating shapes are compared in this study. An empirical formula to describe the degree of reinforcement on the out-of-plane strength of the UMW is derived based on the experimental results. It is observed that the peak load-carrying capacity, ductility, and energy absorption capacity gradually improve with an increase in the strengthening degree or area. Compared with the existing masonry wall reinforcement method, the GFRPU technique is a construction method that can help improve the safety performance along with ease of construction and economic efficiency. Doi: 10.28991/CEJ-2022-08-01-011 Full Text: PDF
Highlights
In terms of the durability of existing buildings, several attempts have been made to improve their lifespan by performing repair and reinforcement
The physical properties of glass fiber-reinforced polyurea (GFRPU) were investigated through experiments. Because it is not certain whether the added glass fiber is uniformly dispersed in the polyurea, 20 specimens were prepared to reduce the deviation of the experimental values, and the tensile strength was measured. It was reported in a previous study [24] that the optimum weight ratio of the milled glass fiber to polyurea for obtaining the peak tensile strength was approximately 5%, and this ratio was used for producing the GFRPU in this study
The effects of the coating type were compared, and a formula to express the degree of GFRPU reinforcement was proposed
Summary
In terms of the durability of existing buildings, several attempts have been made to improve their lifespan by performing repair and reinforcement. Hrynyk and Myers [4] reported that polyurea coating can improve the energy absorption capacity of masonry filling walls and reduce wall. Using FRP and polyurea, elongated fibers were added to improve the tensile strength of polyurea and shear resistance to the masonry filling wall under the impact of an in-plane load. Polyurea reinforced with glass fiber-reinforced polymer (GFRP) was experimentally verified as an effective technique for reinforcing the walls of UMWs [18]. Myer and Tanizawa [3] conducted a study to verify the reinforcing effect of coating UMW with a composite elastomer made of polyurea and chopped E-type glass fibers as an external reinforcing material. Greene and Myers [17] investigated the effect of DFRP coating on the reinforcement capacity and ductility of concrete beams in bending and shear.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
