| 摘要 |
PCT No. PCT/EP90/01672 Sec. 371 Date May 19, 1992 Sec. 102(e) Date May 19, 1992 PCT Filed Oct. 5, 1990 PCT Pub. No. WO91/05111 PCT Pub. Date Apr. 18, 1991.In the case of earth coverings made from concrete paving slabs, the noise generated by rolling traffic is disadvantageous. In order to reduce the generation of noise, plate-shaped concrete blocks exhibiting a significantly larger format than traditional paving slabs are proposed. The top side of the concrete blocks consists of a sound absorption layer (13) of porous concrete. On the bottom side, the concrete block is curved inwards, so that the fringe areas are subjected to a higher load. This results in a stable situation. For the purpose of draining off the surface water, the concrete block is equipped at the sides with upright slots (16), which adjoin the absorption layer (13) of porous concrete.
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