海洋环境中CFRP钢管混凝土复合桩基腐蚀试验研究  

Corrosion Test Study of Concrete Filled CFRP Steel Tube Pile Foundations in Marine Environment

作　　者：庄宁[1,2] 夏浩瑜 董洪汉 李宇翔 ZHUANG Ning;XIA Haoyu;DONG Honghan;LI Yuxiang(Key Laboratory of Coastal Disaster and Protection,Ministry of Education,Hohai University,Nanjing 210098,China;College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [2]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《建筑材料学报》2022年第12期1262-1268,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51679080,51379013)。

摘　　要：通过设计室内高湿热海洋环境模拟系统,运用外加直流电加速腐蚀法,对碳纤维增强复合材料(CFRP)‑钢管混凝土复合桩基在海洋环境中腐蚀特征和力学性能退化规律进行了研究.结果表明:由于桩基各腐蚀区段影响因素不同,桩基腐蚀程度不均匀,其中干湿交替区最严重,大气区次之,水下区最弱;桩基粘贴CFRP后,能有效抑制腐蚀介质入侵,限制表面应变发展;X射线衍射图谱表明其腐蚀产物主要成分为Fe_(2)O_(3)、Fe_(3)O_(4)、α‑FeOOH和γ‑FeOOH,并且产物含量在粘贴CFRP后有明显下降;腐蚀过程中CFRP的侧向约束能有效提高桩基的轴向承载力;通过分析试验过程中桩基应变、腐蚀产物以及承载力的变化规律,将桩基力学性能退化过程划分为一般腐蚀、中等腐蚀和严重腐蚀3个阶段.The corrosion characteristics and the degradation process of mechanical properties of concrete filled carbon fiber reinforced polymer(CFRP)steel tube pile foundations were studied by using the external direct current electrical source to accelerate corrosion under the simulated high humidity and thermal marine environment.The results show that due to the different influencing factors of each corrosion area of the pile foundation,the corrosion degree of the pile foundation is uneven.The corrosion is the most serious in dry and wet alternating area,followed by atmospheric area and the weakest in underwater area.CFRP material can prevent the intrusion of corrosive medium and limit the development of surface strain.The XRD patterns show that the main components of the corrosion products are Fe_(2)O_(3),Fe_(3)O_(4),α‑FeOOH andγ‑FeOOH,and the content decreases significantly with the application of CFRP.CFRP lateral restraint during the corrosion process can effectively improve the axial bearing capacity of the pile foundation.Through the analysis of the pile foundation strain,corrosion products and bearing capacity change law during the test,the degradation process of the pile foundation mechanical properties can be divided into three stages:general corrosion stage,moderate corrosion stage and severe corrosion stage.

关 键 词：碳纤维增强复合材料 干湿交替区 腐蚀 海洋环境 桩基 

分 类 号：TV47[水利工程—水工结构工程]