Abstract: A method for producing concrete products provided with inlaid patterns includes (a) preparing a reusable mold provided with recessed patterns by applying ultra violet rays on the surface of an ultra-violet-ray setting resin plate, (b) preparing a waste mold provided with recessed patterns from the reusable mold, the waste mold being made of a soluble material which can be dissolved by water, solution or heat, (c) casting concrete into the waste mold and solidifying the concrete to provide a concrete block on the waste mold, (d) dissolving and removing the waste mold from the concrete block and providing recessed patterns on the surface of the concrete block, (e) filling a coloring material into the recessed patterns on the surface of the concrete block and solidifying the coloring material, and (f) grinding the surface of the concrete block to produce concrete products provided with inlaid patterns on the surface thereof.

Abstract: A method for producing sulfur plates comprises producing an aqueous mixture by mixing and agitating sulfur powder, inorganic powder, fibers and water, filtering the aqueous mixture to form plates, molding the plates while dewatering, curing and drying the plates, and heating the plates at a temperature higher than the melting point of the sulfur. The sulfur plates attain a desired strength in a short time and are free from any cracks and have an excellent acid resistance.