| 摘要 |
<p>A block, slab or other component 11 is formed from settable material, such as concrete. The material 11 has incorporated therein at least one region 10 formed from an already set material, or a material which is otherwise visually different. The invention provides, for example, a paving slab having markings thereon, the life of the markings being as long as that of the life of the paving slab itself. <IMAGE></p> |
