THE COLORING METHOD OF SURFACE ON THE HARDEN CONCRETE PRODUCTS AND CONCRETE USING METAL OXIDE

摘要

PURPOSE: A cured concrete product using metal oxide and a concrete coloring method are provided to give various colors on the surface of concrete and cured concrete products. CONSTITUTION: A concrete coloring method comprises the following step: coating cured concrete product and the surface of concrete with a mixture including metal oxide which expresses various colors and an acid solution which contains Cl component. The coloring method comprises a colored surface washing step, a coloring agent coating(2 times) step and a residue removal step. The metal oxide is composed of Al2O3, Cr2O3, MnO, Fe2O3, and CuO, and the content of the metal oxide is controlled by desired color. The acid solution contains Cl ion of an amount which can maintain durability of the surface of the concrete and the cured concrete products.