Slab-elements for covering the ground

A composite paving structure consisting essentially of ground covering slab elements, said elements being laid laterally side by side so as to form a substantially continuous paving, each said element being a single piece of concrete consisting of a head portion and a stem portion meeting at a dummy groove allowing, but not necessitating, breakage of said slab elements into heads and stems along said dummy grooves and being delimited by two opposite end faces of equal length joined by opposite sides that form angled traces about a longitudinal axis common to said head and said stem, each said angled trace being formed by a succession of sides comprising at said head an inclined side face inclined at 45.degree. in one direction relatively to said axis, a lateral side face extending lengthwise with respect to said axis, and another inclined side face inclined at 45.degree. in the opposite direction with respect to said axis, and comprising at said stem a lateral side face extending lengthwise with respect to said axis, each said lateral face of said stem being complementary to a lateral face of said head, said end face of said head together with said inclined sides of said head and said lateral faces of said head and said dummy groove describing a centrally symmetrical octagon, said dummy groove together with said end face of said stem and said lateral faces of said stem being symmetrical about the center of said stem, and said head and said stem being mirror symmetrical about said longitudinal axis.

Slab elements for paving ground areas, each of said elements being a single piece of concrete consisting of a head portion being mirror symmetrical with respect to a central axis and symmetrical to its own center and having its outer delimiting lines form six corners with each other at six successive corners, one to six, of an imaginary centrosymmetrical octagon, the corners of which each include an angle of 135.degree. and the side of which, formed by said other two corners, seven and eight, is bisected by said central axis, and a stem or foot portion adjacent said side of said octagon formed by said two corners seven and eight and likewise being mirror symmetrical with respect to said central axis and centrosymmetrical with respect to its own center, and comprising an interlocking indentation line constituted by the delimiting lines of said ground covering slab element and consisting of projections and indentations, with parallel displaceability of one end face line of said ground covering slab element into its other one, with attachability of the longitudinal side of said head portion to the longitudinal side of said foot portion, and with attachability of the head-end face of said ground covering slab element to the longitudinal side of said foot portion and of the foot-end end face of said ground covering slab element to the longitudinal side of said head portion, wherein said indentation line of said foot portion extends only outside of the inside area of an imaginary square, one side of which coincides with said side of said imaginary octagon between said corners seven and eight thereof.