上海洋山深水港中港区码头面层混凝土的现场试验研究

码头面层裂缝的产生与混凝土配合比直接有关,但还与码头结构型式和施工质量等有关。为现场监测码头面层裂缝的产生,选择洋山深水港区中港区码头面层的梁顶、板缝等有代表性的位置,埋入自制的19个应变传感器和2个温度传感器,采用计算机现场监测码头面层应变和温度变化情况。结果表明:板缝和梁顶处的应变较大,是易于形成裂缝的主要部位。应在该位置设置切缝以释放应力或增加钢筋等构造措施,并增加养护时间。

Field Testing and Study of Surface Concrete for Berths in Middle Port Area of Yangshan Deepwater Port in Shanghai

Cracking in surface concrete in berths is directly related to the mix ratio of concrete and is also relevant to the type of structure and the construction quality of the berths.To monitor the cracking in the surface concrete of the berths,nineteen strain sensors and two temperature sensors which were developed and made by the institute were positioned and embedded in some typical locations on the top of beams and joints of slabs for the berths in the middle port area of Yangshan Deepwater Port and computers were used to field monitor the strain and temperature change in the surface layer of the berths.The measured results showed that the strain in the slab joints and beam tops was higher and these locations were prone to cracking.Cuts should be made in these locations to release the stress or additional reinforcement should be made.Curing time should also be increased.