Research Of Performance And Design Method Of Reinforced Concrete Beam Based On ICCP-SS

Carbon fiber has many advantages such as high strength,light weight,corrosion resistance,durability,and ease of construction.It has attracted the attention of many scholars in the field of carbon fiber reinforcement.However,the single carbon fiber reinforcement cannot solve the problem of the durability of the corrosion of the steel bars in the future,and further improvement measures are needed for the increasingly structural deterioration caused by the corrosion of the steel structures of the buildings in coastal cities,such as Shenzhen.Impressed current cathodic protection has been proven to be an effective method for suppressing corrosion of rebar.Based on the conductive properties of carbon fiber,these two elements can be combined to perform double repairs on the components to improve mechanical properties and suppress rebar corrosion,but most of the carbon fiber reinforcements use organic glue as a binder,and the non-conductivity of the organic glue attached to the carbon fiber restricts the feasibility of this solution.In view of inorganic cementitious materials have advantages of high strength,anti-aging,high temperature resistance,etc.,and based on the conductive properties of carbon fiber cloth and inorganic cementitious materials,it can be combined with applied current cathodic protection method,anode termination carbon fiber cloth,cathode termination steel bar Concrete structures are reinforced and protected for long periods of time.Therefore,this paper adopts a combined method of experimental research and design method research to apply external current cathodic protection to reinforced concrete flexural beams reinforced with cemented carbon fiber cloth based on cement-based composite materials and analyze and study them.In the experimental study,the feasibility of the dual repair of the components will be analyzed,and in order to compare the effect of the power-on parameter on the reinforcement effect,two groups of components with different power-on durations are also designed for analysis.The two batches of components were accelerated corrosionfor 3 months and applied current cathodic protection for 3 months.The short-term test scheme with 6 months of accelerated cycle and 12 months of accelerated corrosion and 6 months of cathodic protection for a total of 18 months were used for the test cycle.Test program.The two batches of components were subjected to cathodic protection with carbon fiber as anode and steel as cathode at the 3rd and 12 th month of the test cycle,respectively,for the components requiring cathodic protection.The test shows that the reinforcement of non-energized members with cement-based reinforcement is significant,and it significantly improves the ultimate bearing capacity of the members.The cathodic protection effect of the non-reinforced component is obvious,and it effectively inhibits further corrosion of the steel bar.In the power-reinforced component,due to the effect of structural reinforcement and cathodic protection,the load-bearing force of the energization-reinforced component has the largest increase,which not only enhances the bearing capacity of the component but also alleviates the problem of structural durability caused by corrosion of the steel bar,and is also analyzed.The power-on parameters and power-on duration used in this paper do not have a significant effect on the reinforcement effect.In the design method study,whether the carbon fiber reinforcement based on inorganic glue is still applicable to mature carbon fiber reinforcement specifications.The test parameters were substituted into the CECS146,ACI440,and FIB carbon fiber reinforcement specifications that were used for many years,and the latest inorganic rubber reinforcement specification ACI549 was used to determine the component bearing capacity prediction values and perform comparative analysis.The analysis shows that because the modulus of the reinforcement layer and its ultimate strain are directly taken as the parameters of the carbon fiber,the predicted values of the CECS146 and ACI440 will be too large,even exceeding the test value,in which the FIB specification is effective for the carbon fiber due to the peeling failure.Strain is taken as a fixed value,and the value is particularly conservative,so the predicted value will be much smaller relative to CECS146 and ACI440.ACI549 thinks that the modulus of the reinforcement layer should be taken as the modulus of C-FRCM andits ultimate strain value,and the calculated predictions are in good agreement with the experimental values.