Experimental characterization of reinforcing effects of FRP sheets bonded on mortar and concrete beams

摘要

Much attention has recently been paid in recent years to rehabilitation such as repair and preservation of infrastructure using fiber reinforced plastics (FRP) sheets. This study is aimed at establishing some theoretical basis and guidelines forsuch applications by examining the failure process and the increased fracture toughness of mortar and concrete beams reinforced with carbon and glass fiber reinforced plastic (CFRP, GFRP) sheets. Two kinds of beam specimens with and without a center notch were prepared and subjected to three-point flexure: large specimen of concrete reinforced with GFRP or CFRP sheets and small specimen of mortar reinforced with GFRP sheets The failure process as well as load, strain and crack opening displacement behavior were monitored by acoustic emission (AE) activity. The relation between reinforcing effect and fracture toughness at the initiation of AE activity is discussed based on these results.