Interfacial adhesion between aluminum alloy and reinforced concrete under coupling effect of chloride ion and corrosion current
In order to improve the durability and serviceability of marine concrete structures,a composite structure of aluminum alloy plate reinforced concrete integrating corrosion protection was proposed,based on the sacrificial anode cathodic protection technology.The interface bonding performance of the composite structure was studied,and a calculation method of interface bonding strength under the coupling action of seawater and corrosion current was established.15 sets(a total of 45)of aluminum alloy plate concrete interface shear specimens under indoor environment and coupling environment(seawater and corrosion current)with accelerated corrosion,were designed and single shear tests were carried out.The influences of parameters such as bond length(60 mm,80 mm and 100 mm),bond width(60 mm,80 mm and 100 mm),groove depth(1.5 mm and 2.5 mm)on the surface of aluminum alloy plate,as well as corrosion time(30 days,60 days and 90 days),on the failure mode,extreme load and strain distribution in specimen interface were explored.The results show that interface peeling between bonding layer and concrete is the failure mode under indoor curing,while interface peeling between aluminum alloy plate and bonding layer is the failure mode under coupling environment.As the corrosion time reaches 90 days,the peeling area of concrete decreases obviously,which indicates that the coupling action of seawater and corrosion current can reduce the interface bonding performance of the aluminum alloy plate and bonding layer.The increases of bonding length,width and surface groove depth can enhance the ultimate failure load of the specimen interface under indoor environments,and also alleviate the adverse impact of coupling environment on the bonding performance of the specimen.However,when the bonding length or width exceeds 80 mm,the above relieving effect is weakened.Using the ultimate load obtained from the experiment,the environmental impact coefficient,groove depth coefficient,and coefficients related to the bonding size of specimen were fitted.The Niedermeier bonding strength model was modified,which can be used to predict the bonding strength of aluminum alloy plate concrete interface under the coupling action of seawater and corrosion current.
aluminum alloy plate-concrete interfacecoupling action of seawater and corrosion currentsingle shear testinterface failurebond strength
国家科技期刊平台
NSTL
万方数据
维普
