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基于36根CFRP锚杆与36个环氧砂浆试块酸、碱、盐3种不同环境下的加速老化试验,对CFRP筋及环氧树脂粘结剂的物理性质及两者力学性能变化进行同步试验研究分析,并分析锚固段界面断裂能在不同环境下随腐蚀时间变化趋势。结果表明:CFRP锚杆、环氧砂浆在酸碱盐腐蚀情况下物理性质、强度、弹性模量、延伸率等变化都不大;经腐蚀后粘结滑移量增大50%以上、粘结性能相对影响较大;与酸、盐腐蚀情况相比,CFRP锚杆与环氧砂浆本身及两者间的粘结性能,对碱性腐蚀更为敏感;界面断裂能在碱性环境下腐蚀60d时增加值高达123.8%,90d时增长速率有所降低。研究表明不同环境腐蚀不同时间对CFRP锚杆耐久性能具有较大不同。
Based on the accelerated aging tests of 36 CFRP anchors and 36 epoxy mortar acid, alkali and salt under different environments, the physical properties of the CFRP tendons and the epoxy resin binder and their mechanical properties were synchronized Experimental study and analysis, and analysis of the fracture interface of anchorage can change under different environmental trends with the corrosion time. The results show that the physical properties, strength, elastic modulus, elongation and other changes of CFRP anchor rod and epoxy mortar are not great under the condition of acid-base salt corrosion; the bond slip amount of the CFRP anchor rod and epoxy mortar increases by more than 50% Compared with acid and salt corrosion, CFRP bolt and epoxy mortar itself and the bonding performance between the two are more sensitive to alkaline corrosion; Interface fracture can corrode in alkaline environment for 60 days When added value as high as 123.8%, 90d when the growth rate decreased. The results show that the durability of CFRP bolts is quite different under different environmental corrosion time.