To sufficiently expose a decorative aggregate having an optional grain diameter to a surface of a concrete and clean a joint part by laying a hot melt sheet on the decorative aggregate, heating the whole of it to a melting temperature or higher of the hot melt sheet, and wrapping a part of the decorative aggregate with the melted sheet.
A hot melt sheet is laid on a decorative aggregate having a predetermined grain diameter or on a tile, the whole of it is heated to a melting temperature or higher of the hot melt sheet, and a part of the decorative aggregate is covered with the melted sheet so as to wrap it. For example, natural pebbles 1 are arranged in a container 4 and a hot melt sheet 2 having an ethylene.vinyl acetate copolymer as a base is laid thereon. Next, the whole thereof is heated so as to melt the hot melt sheet, so that a hot melt sheet 3 covered with the pebbles is obtained. The sheet covered with the pebbles is fixed in an inner face of a concrete form with its face having the pebbles inside. A concrete is poured therein and it is left to stand for two days. When the sheet is peeled, a concrete from which the natural pebbles are exposed can be obtained.
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