| 摘要 |
The present invention provides a poured slab, preferably of concrete, which has different coloured portions yet can be made by a simple process comprising (a) pouring a wet concrete mixture comprising cement particles, sand particles and gravel particles into a horizontal mould cavity having a stepped mould bottom surface, (b) curing the mixture to produce a slab with a roughly horizontal rear surface and a stepped front surface corresponding to the mould bottom surface, and (c) mechanically removing the cured mixture between a cut plane generally parallel the rear surface through the slab and the front surface. The resultant slab has different portions with different colouration and appearance due to the cut plane passing through portions of the concrete having different proportions of cement, sand and gravel.
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