混凝土结构层间力学性能的电学表征

以由碳纤维布作为界面层的混凝土及碳纤维混凝土为例,根据混凝土层间接触电阻的变化,对剪切荷载及弯曲荷载作用下的混凝土界面粘接性能及剪切强度进行电学参数变化实验.实验结果表明:素混凝土层间接触电阻随着层间粘接松动而增大,当发生粘接破坏时,则急剧增大;碳纤维混凝土层间接触电阻随着剪切强度的增大而增大,发生剪切破坏时,则急剧增大;碳纤维混凝土层间接触电阻的敏感性比素混凝土层间接触电阻对界面粘接及剪应力的敏感性要好,低应力作用下,碳纤维混凝土层间接触电阻随应力明显变化.

Electrical characterization of mechanical properties between concrete layers

Taken concrete and carbon fiber reinforced concrete layers interfaced with carbon fiber mats examples,the bonding properties and shearing strengthen of the concrete interfaces were electrically tested under shearing and bending loads,based on the relationship between contact resistance and mechanical properties between concrete layers.The experimental result shows that contact resistance between concrete layers increases sharply due to interface debonding.It also indicates that contact resistance between carbon fiber reinforced concrete layers increases with the increase of shearing stress or shearing strength,while increases sharply when the interface debonding occurs.Contact resistance between carbon fiber reinforced concrete layers is more sensitive to shearing stress or shearing strength between layers than that between plain concrete layers,and it changes obviously with the shearing stress of the interface under small stress.