沿海盾构隧道混凝土中氯离子渗透的加速试验方法探讨研究  

Accelerated Test Method for Chloride Ion Penetration in Concrete of Coastal Shield Tunnels

作　　者：张伟[1,2] ZHANG Wei(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430010,China;National-Local Joint Engineering ResearchCenter of Underwater Tunnelling Technology,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]水下隧道技术国家地方联合工程研究中心,武汉430063

出　　处：《广东土木与建筑》2023年第3期116-118,共3页Guangdong Architecture Civil Engineering

摘　　要：某沿海盾构隧道工程所处环境属于典型的亚热带海洋性季风气候,年平均气温约为22.5℃,年平均相对湿度约为82%,具有气温高、湿度大、盐度高的特点,混凝土结构的腐蚀环境严酷,耐久性问题突出。通过对混凝土中氯离子渗透的加速试验方法进行对比研究,分析其氯离子在混凝土加速实验中的影响因素,结果表明在渗透深度为5 mm时,干燥2 d时,渗透面的氯离子含量呈现W/C60%<W/C50%,但在干燥3~4 d时渗透面的氯离子含量呈现出W/C50%<W/C60%。而在渗透深度在15 mm以上时的氯离子含量与加速条件无关,W/C50%<W/C60%。The environment of a coastal river-crossing project belongs to a typical subtropical maritime monsoon climate,with an average annual temperature of about 22.5℃ and an annual average relative humidity of about 82%,which has the characteristics of high temperature,high humidity and high salinity,and the corrosion environment of concrete structures is harsh and the durability problem is prominent.The results show that when the penetration depth is 5 mm,the chloride ion content changes appear,and the W/C is 60%<50% when drying for 2 days,but 50%<60% when drying for 3~4 days.The chloride ion content at a penetration depth of more than 15 mm is independent of the acceleration conditions,and the W/C is 50%<60%.

关 键 词：混凝土 氯离子 耐久性 加速实验 

分 类 号：TU375.2[建筑科学—结构工程]