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Life-span Prediction of Reinforced Concrete Corrosive Expansion Based on Double-G Fracture Criterion

LIU Chuncheng1,2,SHI Lei2,XU Jian1,YANG Jie1 (1.School of Civil and Architecture Engineering,Northeast Dianli University,Jilin Jilin 132012,China;2.School of Civil and Hydraulic Engineering,Dalian University of Technology,Dalian Liaoning 116023,China)  
Based on the corrosive expansion force of reinforced concrete member in Reference [1],the formula of strain energy release rate for crack propagation in corrosive reinforced concrete members was presented by fracture mechanics approach.The double-G fracture criterion was applied on the prediction of crack propagation life-span of corrosive reinforced concrete,and the factors that affect crack propagation life-span,such as the grade of concrete strength,the depth of concrete cover and the rebar diameter,were investigated in detail.The results show that(1) there is a great effect on the life-span of initiation crack expansion,stable crack expansion and unstable crack propagation due to the initial crack length of concrete members;(2) to increase of rebar diameter and concrete strength will enhance life-span of crack propagation,and to increase thickness of concrete cover will cause the life-span of crack propagation decreased in some way.Therefore,it is extremely important to design reasonable concrete cover thickness for improving the durability of concrete structures.
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