Concrete supports in water are typically built using a technique called "caisson construction." This involves creating large, watertight structures, or caissons, that are sunk into the waterbed, often using a combination of excavation and buoyancy. Once positioned, the caissons are filled with concrete to provide stability. After the concrete sets, these supports can be used for various structures such as bridges or piers.
You have a major problem. concrete is not water proof (liquid or vapor)or really even water resistent. If you look at a concrete pool or tank, a thin plaster coating provides the water proof layer - not the concrete. Your best bet is to remove the concrete, lay down a real water proof layer and reinstall the concrete. You can put so called water proof paints/materials on the cement, but they will only last a few years. In the mean time, you will have completely rotted the wood framing that supports the concrete slab.
reinforced concrete and stone
concrete
Concrete.
The Colosseum is built with concrete, faced stone, stone and marble.
Concrete
They used concrete.
Yes, concrete can absorb water.
concrete or bricks
Concrete
No,,l
Concrete is corroded by salted water.