An experimental study of different factors affecting the bond of NSM FRP bars in concrete

Flexural behavior of RC beams strengthened by NSM GFRP Bars having different end conditions

“…The straight and inclined grooves were made during casting of the beams using square wood strips placed inside the molds of the beams. The installation of straight NSM bar was discussed elsewhere [33][34][35]. For the bars with bent ends, the inclined grooves were filled by epoxy and then the NSM bars were applied as in case of straight NSM bars.…”

“…Sharaky et al [1,[33][34][35] studied the bond and flexural behavior of NSM strengthened elements with different material types, epoxy properties, bar size and number of NSM bars using two different techniques to delay or prevent the concrete cover separation or end slip. In the first technique mechanical end anchor was used.…”

Experimental and analytical investigation into the flexural performance of RC beams with partially and fully bonded NSM FRP bars/strips

“…Compared to EB systems, the test data available on bonding between NSM FRP reinforcement and concrete is still limited. Several parameters affect this bonding, such as bar properties (material, surface treatment, shape and size), groove geometry (shape and size), adhesive (type and properties), concrete properties and environmental effects [2][3][4][5][6].…”

“…Several experimental investigations have been performed to assess the load carrying capacity of the NSM technique [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. These have shown that the technique is greatly affected by bond behavior mainly depending on FRP properties, groove surface and dimensions, adhesive and concrete properties and the position of the FRP reinforcement.…”

Excellent bonding behaviour of novel surface-tailored fibre composite rods with cementitious matrix

“…The effectiveness of concrete reinforcement by FRPs depends strongly on the bond behaviour between FRPs and concrete substrate and it is highly desirable to achieve full strength of FRPs before debonding from the concrete (Sayed-Ahmed et al 2009;Iovinella et al 2013). According to recent studies, the bonding strength of FRPs with concrete depends on various parameters such as FRP's embedded length, diameter, surface roughness and strength of concrete and attempts have been made to understand and control these parameters to improve the bonding characteristics (Baena et al 2009;Iovinella et al 2013;Kalupahana et al 2013;Sharakya et al 2013). As surface roughness is a critical parameter influencing the bond behaviour, efforts have been directed towards improving the roughness of concrete surface through various surface preparation methods such as brushing, grinding, scarifying, bush-hammering and steel shot blasting with associated advantages and disadvantages in terms of desired surface roughness, cost and processing time (Iovinella et al 2013).…”