| 摘要 |
A new process for creating a decorative surface on a cast concrete tile. A mold is prepared by coating with mold release. An aggregate of water, coloring dye, sand, portland cement, and pea gravel is pre-mixed. Dampened baking soda is sprinkled randomly into the bottom surface of the mold (which will bear against what becomes the top surface of the cast tile). The pre-mixed aggregate is then added to the mold. The aggregate is then screed and compressed in the mold to minimize voids. A plastic cover is next added to reduce the moisture loss rate and increase the curing time. Once the concrete is cured, the mold is separated into its component pieces and the cast concrete tile is removed. The upper surface of the cast tile will have been etched and otherwise transformed by the dampened baking soda, producing a surface texture similar to limestone.
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