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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.

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Romania has a lot of buildings in serious need of structural rehabilitation, ranging from single-family dwellings and blocks of flats to historical buildings. After the earthquake of 1977, interventions in order to restore the structural bearing capacity of buildings have been few. Although by now some of the buildings (especially monuments) did undergo various rehabilitation procedures, very few of those actually take into account the socalled "holistic approach" to rehabilitation. Broadly, this implies that, as much as possible about the respective structure's history should be known before a rehabilitation solution is selected by the designer. The results indicate that, when the holistic approach is employed, there is a significantly improved possibility for the selection (by the designer) of an appropriate rehabilitation solution. A case study and subsequent review of such an approach - used for the structural rehabilitation of Sections C1 & C2 of the Metropolitan Cathedral of Iasi - is included. [ABSTRACT FROM AUTHOR]