| 摘要 |
<p>An NOx-cleaning paving block comprising a surface layer which contains 100 parts by weight of cement, 10-50 parts by weight of titanium dioxide powder and 100-700 parts by weight of sand and is layered on a concrete-made base layer, preferably with a surface layer thickness of 2-10 mm, wherein the surface layer has a void volume of 10-40% and a water permeability of 0.01 cm/sec. or higher. Further, the surface layer of the block preferably is made uneven, for example, is trapezoid in cross section, corrugated or zigzagged. The NOx-cleaning paving block can be finished so as to have a rough surface by tapping the surface layer containing titanium dioxide with many projections from a surface-roughening tool, for example. The surface layer can further incorporate an adsorbing material mixed at a weight ratio of 5-30 to 100 parts by weight of a total composition of the surface layer except water. One or more of zeolite, Magadiite, petalite and clay is used as the adsorbing material. Ten to fifty percent of the sand can be replaced by glass beads and/or glass powder having a particle size of 1-6 mm. <IMAGE></p> |
