植筋胶与混凝土界面结合性能的试验研究

发布时间：2019-04-24 07:59

【摘要】：为探究植筋胶与混凝土之间的界面结合性能,设计了混凝土植筋挤压试验方案。即在混凝土试块钻孔、注胶、植筋后,通过在钢筋顶部施加压力将植筋胶体包裹着钢筋一起压出混凝土试块。经过探索性试验后对试验方案进行了改进,使得所有试件均发生所预期的植筋胶与混凝土的界面破坏,且不出现混凝土锥体破坏。试验结果显示,植筋胶与混凝土界面的压力-滑移曲线呈明显的三阶段模式,即弹性粘结段、粘滞滑移段、摩擦滑移段。弹性粘结段的界面结合力以化学粘结力为主,黏滞滑移段的界面结合力以机械啮合力为主,摩擦滑移段的界面结合力以摩擦力为主。根据试验结果回归得到植筋胶-混凝土界面黏结滑移本构关系,可用于植筋黏结的有限元分析。
[Abstract]:In order to explore the interfacial bonding performance between reinforced plastic and concrete, the extrusion test scheme of reinforced concrete was designed. That is to say, after drilling in the concrete test block, injecting glue and planting reinforcement, by applying pressure on the top of the steel bar, the colloid of the planting bar is pressed out of the concrete test block together with the steel bar wrapped in the steel bar. After exploratory test, the experimental scheme is improved, so that the interface failure between reinforcements and concrete is expected to occur in all specimens, and no concrete cone failure occurs. The experimental results show that the pressure-slip curve of the interface between reinforcements and concrete shows a three-stage model, that is, elastic bond section, viscous slip section and friction slip section. The interfacial bonding force of elastic bond segment is mainly chemical bonding force, the interfacial bonding force of viscous sliding section is mainly mechanical meshing force, and the interfacial bonding force of friction sliding section is mainly friction force. According to the experimental results, the bond slip constitutive relation of the adhesive-concrete interface is obtained, which can be used for the finite element analysis of the bond between the steel bar and the concrete.
【作者单位】：同济大学建筑工程系;慧鱼(太仓)建筑锚栓有限公司;
【基金】：国家自然科学基金资助项目(51178329)
【分类号】：TU37

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