Experimental Study On The Reinforced Concrete Beam Strengthened With Carbon Fiber Laminate

The carbon fiber laminate is a new type of structural materials in civil engineering. In recent years, the technology by which reinforced concrete members are strengthened with the carbon fiber laminate is applied gradually in the field of the construction reinforcement. This technique has the following advantages:the evidence increment of stiffness and strength of reinforced concrete members, corrosion resistance, fatigue resistance, ease of construction, and changeless self-respect of the structure. By means of the four-point bending test of the reinforced concrete beam strengthened with the carbon fiber laminate, the failure mode, stiffness, and flexural capacity of the beam are studied in this thesis. The influence of the length and thickness of the carbon fiber laminate, the bonded angle at the end of the laminate, the thickness of the adhesive layer, and the experimental temperature on the reinforcing effect is researched. Furthermore, the peeling process of the reinforced concrete beam strengthened with the carbon fiber laminate is observed.Ten pieces of the reinforced concrete beams with the rectangular cross-section are poured in the experiment, where one of them is unstrengthened and used as the contrast of the reinforcing effect and the remains are strengthened with different forms. The experimental results show that it is effective that the reinforced concrete beam is strengthened by the carbon fiber laminate to improve its flexural capacity; after pasting the carbon fiber laminate, the flexural capacity of the beam is improved significantly, especially its limit; the reinforcing effect can be effectively improved by increasing the length and thickness of the carbon fiber laminate as well as the thickness of the adhesive layer and decreasing the bonded angle at the end of the laminate and the experimental temperature. The reinforced concrete beam strengthened with the carbon fiber laminate can effectively increase the flexural rigidity and decrease the deflection of the beam, and it also can inhibit the development of the cracks in the beam. The results obtained in this thesis can provide an experimental basis for engineering application.