介绍了水下自密实混凝土的配合比设计，生产，检验方法及验收等一系列问题，总结了苏通大桥承台成功封底的施工工艺，对以后同类施工有一定指导和借鉴。

The paper summarizes the definition of self-compacting concrete and its workability, discusses in detail the research and development of the methods for testing SCCs passing ability in the world.

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