摘要
本文通过对暴露长达10年的表面涂层混凝土试件和青岛市胶州湾大桥实体结构进行涂层粘结强度、氯离子浓度等测试,对涂层应用在混凝土结构上的长期防护效果进行了研究。结果表明:在冰冻海水环境暴露10年后,大气区、浪溅区和水变区混凝土表面涂层的粘结强度均超过1.5 MPa,符合现行规范要求;在浪溅区和大气区环境下,涂层对海工混凝土的长期防护效果较好,但在水变区环境下涂层的防护效果相对较差;有涂层混凝土试件的表观氯离子扩散系数与无涂层混凝土在水变区环境下已无明显差别;大桥实体结构中有涂层混凝土的表面氯离子浓度较无涂层混凝土降低了2.3~3.9倍,且涂层对于实体结构的抗氯离子长期侵蚀效果稍弱于小尺寸混凝土试件。
In this paper, the bonding strength and chloride ion concentration of coatings were tested on the surface-coated concrete specimens exposed for 10 years and the solid structure of Qingdao Jiaozhou Bay Bridge. The long-term protective effect of the coatings applied to the concrete structure was studied. The results show that after 10 years exposure to the frozen seawater environment, the bonding strength of the coatings on the concrete in the atmospheric zone, the splash zone and the tidal zone all exceed 1.5 MPa, which still meets the requirements of current specifications. Compared with the tidal zone, the coatings on the marine concrete exposed in the splash zone and the atmospheric zone show better long-term protection. In the tidal zone, the apparent chloride ion diffusion coefficient of the coated concrete specimens is not significantly different from that of uncoated concrete. The surface chloride ion concentration of the coated concrete in the structure of the bridge is 2.3 to 3.9 times lower than that of the uncoated concrete, and the long-term chloride ion corrosion resistance of the coatings on the bridge is slightly weaker than that of the small-sized concrete specimens.
作者
张宏
朱海威
杨海成
李永超
ZHANG Hong;ZHU Haiwei;YANG Haicheng;LI Yongchao(Qingdao Highway Co.,Ltd,Shandong High-Speed Group,Qingdao 266061,China;Key Laboratory of Harbor&Marine Structure Durability Technology of the Ministry of Communications,CCCC Forth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China)
出处
《硅酸盐通报》
CAS
北大核心
2022年第4期1301-1307,共7页
Bulletin of the Chinese Ceramic Society
基金
山东省交通运输厅科技计划(2019B42)。
关键词
冰冻海水环境
涂层
海工混凝土
暴露试验
结构检测
粘结强度
氯离子
frozen seawater environment
coating
marine concrete
exposure experiment
structure test
bonding strength
chloride ion
