Matrices can also be made of concrete of the brand «200». After cooling concrete on the flat parts of the matrix, a working surface is arranged from the finishing solution of the composition 1: 2 or 1: 3 on the cement of the “400” brand and river sand. The layer of the solution is smoothed with wooden racks and iron and iron until the crust of cement stone is formed 3-4 mm thick. The working layer of the matrix can be made from a mosaic solution with subsequent grinding.
Cement stone is
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