Study On Mechanical Property And Durability Of Glass Fiber Reinforced Polymer Rebar

Fiber Reinforced Polymer rebar is usually made of multi-strand continuous fiber and matrix resin. Because of its light weight, high strength and excellent corrosion resistance, FRP rebar can become the substitution of steer rebar in some special civil engineering structure. The GFRP rebar discussed in this dissertation were manufactured by ourselves with the FRP pultrusion-winding equipment. The research on basic properties of GFRP rebar and durability of GFRP rebar in different environment were investigated in this dissertation. The main contents and achievements of this thesis are as follows:1. Through a large number of tests,the functions and operations of different components in the FRP pultrusion-winding equipment were grasped. The best proportion of thermosetting resin and additive were concluded. Through changing the relationship between pulling speed and winding speed to make reinforced material surface with different rib spacing, through changing the degree of axial force to make reinforced material surface with different rib depth, thereby GFRP rebars with different surface forms were produced. Through testing the tensile strength, elastic modulus and elongation ratio, bending strength, compressive strength of GFRP rebars,the influence of different surface forms on the mechanical properties of GFRP rebars were investigated.2. Through mixing muti-etherified melamine resin and waterborne epoxy resin with different mass ratio,the infiltrating fluid was made. The glass fiber tape was made from the infiltrating fluid and glass bundle in a certain temperature. The tapability, flexibility and mechanical property of glass fiber tape were researched. Using glass fiber tape to replace nylon rope as wrapping material, thereby the GFRP rebar with its surface around glass fiber tape were produced. Through testing the tensile strength, elastic modulus and elongation ratio, bending strength, compressive strength and torsional property of GFRP rebars, the influence of materials on the mechanical properties of GFRP rebars were investigated.3. Through the tensile test on 15 GFRP rebar specimens in acid, alkali and salt solution for 150 d and the bending test on 30 GFRP rebar specimens in acid,alkali and salt solution for 150 d and 270 d,the influence of corrosion medium and corrosion time on the durability of GFRP rebar were investigated. In addition, the corrosion mechanism was also analyzed from the appearance and microcosm.