【作者】 王伟； 付凯； 薛伟辰；

【Author】 Wang wei,Fu kai,Xue weichen (College of Civil Engineering,Tongji University,shanghai,200092,China)

【机构】 同济大学土木工程学院；

【摘要】 钢筋锈蚀是影响混凝土结构耐久性的主要因素。纤维增强塑料(FRP)筋作为一种新型钢筋替代材料是彻底解决混凝土结构中钢筋锈蚀问题的有效途径。按照ACI 440.3R-04规定的试验方法,对120根GFRP筋在温度为60℃的模拟混凝土溶液环境下的耐久性能进行了加速老化试验研究。试件参数包括三种GFRP筋直径与两个应力水平。老化时间分别为3.65d、18d、36.5d、92d和183d。研究表明:随着时间的增加,GFRP筋抗拉强度衰减明显;侵蚀183d后,12.7mm、16mm和19mmGFRP筋的抗拉强度衰减量分别为56.08%、48.81%和47.08%;随着应力水平的提高,GFRP筋表面坑蚀现象愈发明显,纤维与树脂界面破坏严重。更多还原

【Abstract】 Steel corrosion is the main factor of the durability of concrete structures.The application of Fiber Reinforced Plastic(FRP) rebar which is a new alternative material in the concrete structure is an effective way to solve the problem of steel corrosion completely.According to the ACI 440.3R-04,120 GFRP rebars with three different diameters and two different stress states were immersed into simulated concrete solution at 60℃for 183d.The results show that,with the aging time,tensile strength of GFRP rebar decreased significantly.After being exposed to alkaline environment for 183d,tensile strength degradation of 12.7mm,16mm and 19mm GFRP rebars were 56.08%,48.81%and 47.08%,respectively.With the stress levels increased,corrosion pits in the surface of GFRP rebars became more obvious and fiber and resin interface were severely damaged.更多还原