Eeperimental Study On Interfacial Adhesion And Flexural Behavior Of RC Beams Strengthened With TRC

Textile Reinforced Concrete(TRC)is technology which uses concrete mortar to bind high strength fiber fabric to concrete surface.Compared with the FRP reinforcement technology,TRC is easier to interpenetrated with concrete of base structure because of the using of mortar.It has good temperature resistance and works well in underwater environment.This paper,by using TRC bonding strength test instrument to explore the method to improve the performance between concrete mortar and fiber fabric and also establishes TRC bonding strength model based on the data of double shear test.The effects of the effective bonding length,dipping epoxy resin,adhering sand and the net spacing of the fiber were studied.This paper studies the influence of strengthening of TRC reinforcement beams,including dipping epoxy resin and adhering sand.The conclusions as follows:(1)The compressive strength of concrete mortar has an important influence on the bonding property of TRC strengthened layer.High compressive strength of concrete mortar leads to small effective bonding length.(2)In this paper,it is recommended to control the slippage of the fiber web and improve the interfacial bond strength by adhering sand.Under the premise of effective bonding length,dipping epoxy resin and adhering sand could increase bond strength by 23.5%.(3)In the elastic stage,the stiffness of reinforced beams are similar with the unreinforced beam.But the reinforcement of fiber plays an important role in the yield failure stage.Increasing the fiber fabric will make the stiffness of reinforced beams increased significantly,but reduce the ductility performance.The ultimate bearing capacity of the beam was increased by 24.4%.(4)Regarding fiber fabric as linear elastic material is suitble for theoretical calculation of RC ultimate load.TRC reinforced beams experimental data are in reasonable agreement with this theoretical calculation.