Concrete consists of cement (10), gravel (6, 6a, 6b), aggregate and water. To increase the tensile strength, part of the aggregate is replaced by longitudinal reinforcing elements (1, 11, 12, 17), which are added before or during mixing. When the concrete sets, these are then anchored in an arbitrary spatial arrangement in the structure. To avoid segregation of the raw concrete due to gravity, the density of the reinforcing elements (1, 11, 12, 17) is selected so as to correspond to that of the raw concrete. This concrete exhibits a high tensile strength in all directions. This strength may be increased by using reinforcing elements (1, 12) with curved ends, whereby the curvature radius corresponds preferably to that of the grain (6) which is enclosed in the concrete. By selecting the material for the elements and as applicableby varying the filling of the voids, the atomic or nuclear properties of the concrete can be adapted to the required values.
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