BOND PERFORMANCE OF ULTRA-HIGH MODULUS CARBON FIBER REINFORCED POLYMER (CFRP) ROD ATTACHED WITH GLASS FIBER REINFORCED POLYMER (GFRP) RIBS

Abstract

 Near Surface Mounted (NSM) method using Carbon Fiber Reinforced Polymer (CFRP) rods of ultra-high modulus is suitable to strengthen cantilevered deck slab subjected to negative bending moment. The NSM technique has some advantages such as negligible increase of dead-load and no corrosion of reinforcement. However, the most concern is low bond strength of the ultra-high modulus CFRP rods without shear-resistant ribs. This study focuses on the bond improvement method of the ultra-high modulus CFRP rod embedded in concrete or mortar which is a filling material for NSM. The pull-off test of CFRP rod embedded in concrete or mortar was conducted to examine bond performance. The test result confirmed that the attachment of Glass Fiber Reinforced Polymer (GFRP) rib to the CFRP rod is relatively effective to improve the bond performance. This paper presents the best dimensions of the GFRP rib to effectively improve bond performance of the ultra-high modulus CFRP rod.