Is underwater concrete a special type of concrete or just a pouring method?

The concept of underwater concrete includes two aspects: mix design and construction methods. Compared with ordinary concrete, these two aspects have special features. Its mix design has special requirements in terms of strength and working performance. (In addition to general underwater concrete, there is also underwater non-dispersible concrete). The pouring method generally uses conduit pouring for cast-in-place piles, continuous walls, and caisson back seals. There are special requirements for underwater non-dispersible concrete. Therefore, underwater concrete is a special kind of concrete, and the pouring method also has its own special features.