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为了研究硫酸盐腐蚀对碳纤维增强复合材料(CFRP)-混凝土界面性能退化的影响。通过硫酸盐干湿交替加速腐蚀试验模拟硫酸盐环境,对硫酸盐腐蚀下CFRP-混凝土界面粘结性能退化规律进行了研究。结果表明:硫酸盐干湿交替作用对CFRP-混凝土界面的破坏形态影响较大;界面粘结性能(峰值剪应力、极限承载力和初始剪切刚度)随腐蚀时间呈先小幅增加后加速下降的趋势。在试验和已有界面理论的基础上,提出了考虑腐蚀时间的界面粘结-滑移模型,通过模型预测数据与试验数据的对比分析,该模型能够很好反映硫酸盐干湿交替作用下界面粘结性能退化规律。
In order to study the effect of sulfate corrosion on the degradation of interface properties of carbon fiber reinforced composites (CFRP) -concrete. The sulphate environment was simulated by alternating wet and dry corrosion of sulphate sulfate, and the degradation of the bond properties of CFRP-concrete interface under sulphate corrosion was studied. The results show that the wet-dry alternation of sulfate has a great influence on the fracture morphology of CFRP-concrete interface. The interfacial adhesion properties (peak shear stress, ultimate bearing capacity and initial shear stiffness) increase slightly with the increase of corrosion time and then decrease rapidly trend. Based on the experimental and existing interface theory, an interface bond-slip model considering the corrosion time is proposed. By comparing the model predictive data with the experimental data, this model can well reflect the effect of interface between sulfate wet and dry alternating Degradation of adhesion properties.