This is something you might talk to a concrete supplier about. They can give information on the different mixes and applications for sealing. I know regular cement/concrete needs reinforcement with wire mesh and rebar. Even with that it needs expansion joints so it won't crack. There must be something in the mix for pools and ponds so it can be one continuous pour and not need the joints.

As an alternative you could use regular reinforced concrete and line your pond with a rubber pond liner like those used for koi ponds in peoples backyards.
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BigT
There is a difference between ignorance and stupidity. The ignorant can be taught, stupidity is beyond our control.
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