铝合金板与混凝土的粘结性能

Study on bond behaviors between aluminum alloy plate and concrete

铝合金材料具有强度高、变形性能好、耐腐蚀等优点,是沿海侵蚀环境中钢筋混凝土结构加固工程的理想材料;而铝合金板与混凝土的粘结性能是铝合金板加固钢筋混凝土梁能否协同工作的关键问题。基于此,对铝合金板与混凝土的粘结性能进行试验和理论研究。考虑混凝土强度、铝合金板宽度和厚度、粘贴长度及界面处理等因素对铝合金板和混凝土块体粘结性能的影响,设计了一套试件固定装置,采用万能试验机对105个铝合金板与混凝土棱柱体的粘贴试件进行了面内单剪试验。根据试验结果,结合理论分析,得到了铝合金板和混凝土连接的粘结破坏典型特征、剪应力分布曲线和粘结滑移曲线。研究表明,试件存在两种破坏形式:界面剥离破坏和混凝土层剥离破坏。界面处理对粘结性能有重要的影响,粘贴界面没有进行糙化处理的试件发生了界面剥离破坏,其他试件发生了混凝土层剥离破坏;随着混凝土强度的提高、铝合金板宽度和厚度的变小,粘结性能提高;存在一个有效粘贴长度,当粘贴长度大于有效粘贴长度后,增大粘贴长度并不能提高连接的极限荷载。

The aluminum alloy material is of advantages,including as high strength,good deformation performance and corrosion resistance.And it is an ideal strengthen engineering material for reinforced concrete structures in coastal erosion environment.The bonding performance of the aluminum alloy plate and the concrete is the key issue for cooperative work of RC beam strengthened with aluminum alloy plate.Therefore,the bonding behaviors between aluminum alloy plate and concrete are studied theoretically and experimentally.In order to take into account the effects of concrete strength,width and thickness of aluminum alloy plate,bonding length and interfacial treatment on bonding performance between aluminum alloy plate and concrete block,a set of fixture device was designed.In-plane simple shear tests of 105 aluminum alloy plates adhering on concrete prism were carried out by universal testing machine.Combined with experimental results and theoretical analyses,the typical bond failure characteristics,the distribution of shear stress and the bond-slip curve were obtained.Results show that there are two types of failure modes on specimen:failure caused by debonding of interfacial and by stripping of concrete layer.Interfacial treatment has important influence on the bonding properties.Failure caused by interfacial debonding appeared on specimen with no rough treatment.Failure of the other specimens is stripped by concrete layer.The bonding performance is improved with the increase of concrete strength,and decrease of width and thickness of the aluminum alloy plate.The bonding ultimate load cannot be increased when the bonding length is greater than that of the effective bonding length.