硫酸盐环境下CFRP-混凝土界面黏结强度试验研究

Experimental Study on Bond Strength of CFRP-concrete Interface in Sulfate Environment

通过硫酸盐加速侵蚀试验模拟硫酸盐侵蚀环境,采用双剪试件对硫酸盐侵蚀环境下CFRP-混凝土界面性能(界面黏结强度、断裂能及有效黏结长度)随侵蚀时间的退化规律进行试验研究。试验结果表明,界面黏结强度和界面断裂能随着硫酸盐侵蚀时间的增加均有所下降,而界面有效黏结长度有所增加。通过对试验结果的统计回归分析,给出了界面断裂能和有效黏结长度随硫酸盐侵蚀时间的关系表达式,建立了硫酸盐环境下CFRP-混凝土界面的黏结强度模型,预测模型能够很好的反映界面黏结强度随硫酸盐侵蚀时间的退化规律。

The sulfate erosion environment was simulated by sulfate accelerated erosion test.Double shear test piece was used to study the degradation law of the performance of CFRP-concrete interface(interfacial bond strength,fracture energy and effective bond length)under sulfate attack environment with erosion time.The experimental results show that the interface bond strength and interfacial fracture energy decrease with the increase of sulfate attack time,while the effective bond length of the interface increases.Based on the statistical regression analysis of the experimental results,the relational expression of the interface fracture energy and the effective bonding length with the sulfate corrosion time was given.The bonding strength model of CFRP-concrete interface in the sulfate environment was established The prediction model can well reflect the degeneration of the interfacial bonding strength with the corrosion time.