METHOD OF CHANGING COLOR OF SURFACE OF CEMENT-BASED MATERIAL AND CEMENT-BASED MATERIAL MANUFACTURED BY USING THE SAME

摘要

A method for changing the surface color of cement-based materials and the cement-based material produced by the same are provided to form the antique color on the surface of the cement-based material by using waste acid and to improve durability of the cement-based material. A method for changing the surface color of cement-based materials(100) comprises a step for spraying waste acid(50) on the surface of the cement-based material, wherein the waste acid contains at least one metal salt selected from a group comprising copper, zinc, aluminum, titanium, nickel, mercury, and iron and a step for drying the cement-based material coated with waste acid. Before the waste acid spraying step, the waste acid is diluted in the water. The cement-based material coated with waste acid is dried at normal temperature for 6~12 hours.