| Title |
Effect of ECC for Resisting Propagation of Splitting Crack on the Interfacial Bond Surface of Steel and GFRP Rebars |
| Keywords |
GFRP Rebar ; PVA Fiber ; Interface ; Engineering Cementitious Composite ; Relative Bond Strength |
| Abstract |
An experimental investigations on the interfacial bond and failure properties of the steel and helically wrapped GFRP bars in engineered cementitious composite with Polyvinyl Alcohol (PVA) fibers are presented. A total of 12 cube specimens were prepared and 2% of PVA fibers by the total volume was used. The effect of PVA-ECC on the compressive strength is negligible. However, ECC with PVA fibers significantly changed the failure mechanism during the pullout of the steel and the GFRP bars as well as a slight improvement of the bond strength. Although the pullout load vs. slip during the initial part of loading showed a relatively linear relationship, near maximum load the PVA fibers in matrix started to control the initiation and the growth of micro-cracking. ECC made the splitting failure of the matrix more ductile type by fiber bridging effect in the interface. The failure of the interface on the GFRP bars was initiated between the resin and the fiber rebar due to relative high strength of the matrix reinforced with PVA fibers. The helically wrapped GFRP bars rather than the steel bars resulted in the best performance on the control of the initiation and propagation of micro- or macro-cracks as well as the improvement of the toughness. |