一、影响码头耐久性的问题提出洋山深水港区建设是党中央、国务院的重大战略决策,是加快推进上海国际航运中心枢纽港建设的重点项目。洋山深水港区属于海港工程,由于混凝土结构经常与海水接触并处于潮湿环境中,氯离子渗入容易引起钢筋锈蚀,导致10～20 I. Problems Affecting the Durability of Terminals It is proposed that the construction of the Yangshan Deepwater Port Area be a major strategic decision of the CPC Central Committee and the State Council and a key project for accelerating the construction of the hub port of Shanghai International Shipping Center. Yangshan Deepwater Port belongs to the harbor project. Because the concrete structure is often in contact with the sea water and is in a humid environment, the chloride ion infiltration easily causes corrosion of the steel bar, resulting in 10-20