Experimental Study On Performance Of Reinforced Concrete Beam Under Load And Chemical Corrosion

In view of the actual service status of reinforced concrete in coastal and inland salt lake areas,the effects of loading and chemical corrosion on the performance of reinforced concrete were studied,providing necessary scientific basis for the durability research of reinforced concrete structure in complex environment,and providing enlightenment for the architectural design of coastal and inland salt lake areas in China.Experiment with C35 strength grade of reinforced concrete beam as the research object,through the age of28 d beam,P_u bearing capacity limit test beam load value,using the hydraulic jack loading tests are carried out,at the same time,using a custom for soaking pool corrosion test,using the method of accelerated test to power,the load and the influence of the chemical corrosion effect of reinforced concrete structural behavior rule and etch the ion diffusion behavior,and affect the service life of the structure;The relationship between the deterioration of concrete and corrosion of steel bar and the condition of loading corrosion was studied by ultrasonic detector and crack detector.Experimental results show that under the chemical corrosion effect,with the increase of load ratio,soaking in sodium chloride solution of RC beam dynamic elastic modulus increases,relative to the load of 0.5 P_u,P_u in load 0.7 when the dynamic elastic modulus increases by 5.9%,while soaking in sodium chloride and sodium sulfate mixture of RC beam dynamic elastic modulus decreases,and relative to the load of 0.5 P_u,P_u in load 0.7 when the dynamic elastic modulus is reduced by 3.5%.With the increase of load ratio,soaking in sodium chloride solution of RC beam,the residual bearing capacity increases gradually,relative to the load of 0.5 P_u,P_u in load 0.7 when the residual bearing capacity increased 15.56 kN,and soaking in sodium chloride and sodium sulfate mixed solution of the RC beam,the residual bearing capacity gradually decreases,and relative to the load of 0.5 P_u,P_u in load 0.7 when residual capacity reduces 6.66 kN.Under the chemical corrosion effect,under the load of load ratio,the greater the RC beam reinforcement corrosion,as the rebar corrosion rate increases gradually,the displacement ductility decrease coefficient of the RC beam gradually increased,in sodium chloride solution of experimental beams corroded more apparent,when loading a value of 0.7 P_u,rebar corrosion rate of the maximum 5.5%,maximum ductility decrease coefficient reached 0.352.Figure44;Table24;Reference54...