Abstract
AbstractThis study presents the fatigue durability of a cantilevered deck slab strengthened by Near-Surface-Mounted (NSM) method using Carbon Fiber Reinforced Polymer (CFRP) rods. The CFRP rod manufactured by PULTRUSION method has ultra-high modulus of 450 GPa. The study used a polymer-cementitious mortar of ultra-high-early strength as a filling material for CFRP rod while the rod is generally embedded in epoxy-resin mortar/adhesive. The ultra-high-early strength mortar can contribute to shortening the construction term for strengthening upper-deck slabs. The CFRP rod has little shear-resistance ribs, so the bond performance in concrete is significantly low. In this study, Glass Fiber Reinforced Polymer (GFRP) ribs were attached to CFRP rods to improve the bond performance. To examine the fatigue durability, the study conducted a moving-wheel load test for a cantilevered deck slab embedding the bond-improved CFRP rods. The test shows that the cantilevered deck slab strengthened with the bond-improved CFRP rods had the excellent fatigue durability even to 150% higher wheel load than the load in Japanese design code.
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