| abstract |
A method for the even and permanent coloration of concrete by adding a metal compound to the unset concrete being manufactured. The metal compound, especially a metal salt, is in an oxidized form when added and forms a pigment colouring the concrete only in reaction with compounds that have arisen during the hydration of the cement in the concrete, or which have dissolved from the atmosphere into the pore water of the concrete, or which have possibly been added to the concrete, to form a coloured compound with low solubility in water, and which colours the concrete. Alternatively, the metal is added both in a metallic form and as a salt. |