码头胸墙大体积混凝土裂缝成因分析及防裂措施

依托在建的以色列阿什杜德港项目,针对其TRS码头胸墙典型施工中出现大量竖向裂缝的问题,结合施工方案及温度监测数据对裂缝成因进行分析研究,得出裂缝的成因主要是由于分层浇筑时上层的收缩受到下层的约束造成的结论。采取在加拌冰屑控制入模温度的基础上,调整为整体一次浇筑的措施,并通过优化混凝土配合比以及加强保温保湿养护促进细小裂缝自愈,解决了大体积混凝土裂缝的问题,值得阿什杜德港项目后续Q27主码头及类似条件下的大体积混凝土施工借鉴参考。

Causes analysis and control methods study for cracks of mass concretein fascia beam construction

Based on the construction project of Hadarom Port at Ashdod,Israel,to solve the problem that many of cracks occurred in the typical construction of fascia beam of Quay TRS(Temporary Retaining Structure),we comprehensively review the construction method statement and temperature monitoring data for causes analysis of the cracks with a conclusion that the main reason for cracks is the constrain from bottom to upper layer of concrete.Therefore we apply one-layer casting as the solution together with ice shaving to control casting temperature,concrete mix design optimization,and concrete curing for cracks healing.It can provide a reference for future concrete structure construction of Quay 27 and the projects in similar conditions.