港珠澳大桥主体混凝土结构120a使用寿命耐久性对策

跨越伶仃洋海域的港珠澳大桥提出了120 a使用寿命的建设目标,如何提高外海、高温、高湿环境下混凝土结构耐久性是工程建设面临的重大问题之一。结合港珠澳大桥工程实践,在工程建设前期和设计施工阶段,开展了针对混凝土结构耐久性的系列研究工作。在研究成果基础上,从耐久性设计、施工及后期维护等方面,提出了为确保港珠澳大桥达到120 a使用寿命所应采取的耐久性对策和措施。

Durability strategy for main concrete structure of Hong Kong-Zhuhai-Macao bridge with designed service life of 120 years

The service life of Hong Kong-Zhuhai-Macao bridge,which crosses the Pearl river estuary,is designed as 120 years.How to improve the durability of concrete structure located at the open sea with high temperature and humidity became one of the most important issues for the bridge construction.The systematical research on the concrete durability was carried out before and during the construction period based on the engineering practice.Based on the research,the strategies and measures for the durability design,construction and maintenance,which were applied to ensure the service life of 120 years,are expounded.