Abstract: A construction set having a floor, rectangular outer wall and inner partition modules, the surface of the floor and one edge of the modules having an identical jointing structure formed by mortises, or tenons, aligned in two directions parallel to the edges of the floor, and adaptation elements having on two of their opposite faces a jointing structure complementary of that of the floor and of the modules, formed by tenons, or mortises. The set offers numerous possibilities of construction.

Abstract: A composition for plugging the tap holes of blast furnaces consists essentially of about 70% to 85% of a mineral component comprising refractory clay, a granular refractory aggregate having a high mechanical strength and a high-carbon mineral material, and a polymerizable hydrocarbon binder comprising a hydrocarbon derivative derived from the distillation of crude petroleum oil and having an initial boiling point higher than 200.degree. C, a thermosetting resin which is stable at temperatures of the order of 200.degree. C and is of such composition that the beginning of the mass setting process can be adjusted from 130.degree. C up, or a combination of such hydrocarbon derivative and resin. The composition may also contain a secondary binder comprising a high-carbon material such as coal tar pitch or petroleum oil pitch which is solid at 20.degree. C, has a high coking capacity and is adapted to mix up with the polymerizable hydrocarbon binder at temperatures within the range of 130.degree. C to 200.degree.