| 摘要 |
A body (5) of set, initially pasty material, such as concrete, includes an electrically conducting path formed by a concentrated layer (6) of electrically conducting magnetizable elements, such as fibres (F) or granule s (G), embedded in the initially pasty material and extending through at least a portion of the body (5). Electrically conducting terminal members (9) may be connected to the electrically conducting layer (6) at spaced-apart positions along the layer (6). A method of providing such a body (5) includes the step s of: (a) forming a body of the pasty material in which electrically conductin g magnetizable elements (F) are dispersed, (b) applying a magnetic field to th e body of pasty material to form from the magnetizable elements an electricall y conducting layer embedded in the body of pasty material and extending at lea st through a portion the body (5), and (c) causing the body of pasty material containing the layer (6) to set. Before or after the setting of the body (5) of pasty material, electrically conducting terminal members (9), may be connected to the electrically conducting layer (6) at spaced-apart positions along the layer. |
