Structural element for constructions

1. A structural element for constructions comprising a structure ( 2 ) made of concrete and/or geopolymer and/or alkali activated material;

characterised in that it comprises at least one tensioned strip ( 3 ) made of a fibre-resin composite which:

surrounds said structure ( 2 ), compressing said structure;

at least partly surmounts an external surface ( 20 ) of said structure ( 2 );

said strip comprises a plurality of superposed layers ( 30 ) made of a fibre-resin composite which surround the structure ( 2 ); a more external layer being connected to a more internal layer without external means for maintaining a tension of said strip ( 30 ).

2. The element according to claim 1 , characterised in that said strip ( 3 ) comprises two flaps ( 21 ) which surmount one another and which adhere by gluing.

3. The element according to claim 1 , characterised in that the fibre comprises a plurality of filaments; the filaments extending flanked to one another, not intertwined to form a warp and a weft.

4. The element according to claim 1 , characterised in that said layers ( 30 ) are superposed on one another, the more external layer being glued to the more internal layer without external means for maintaining a tension of said strip ( 30 ).

5. The element according to claim 1 , characterised in that the fibre-resin composite defines a barrier having a low permeability to water.

6. The element according to claim 1 , characterised in that it comprises one or more sheets ( 4 ) of an organic polymer interposed between two superposed zones of said strip for improving impermeabilization to water.

7. The element according to claim 1 , characterised in that said fibre is a glass fibre or a carbon fibre or a basalt fibre.