Abstract
There exists an interest to realize impermeable concrete, which would have many applications in bridges and water transport / storage structures, such as tanks, reservoirs, gutters and pipes. Furthermore, it would be possible to use such a type of concrete in other structures where the water pressure represents an exterior action, such as basement walls, caissons and slab foundations. However, absolutely impermeable concrete is almost impossible to be obtained, hence low – permeability concrete could be the correct technical term. In the current article, several samples of such concrete (containing active admixtures) are detailed and relevant conclusions are drawn.