PROCESS TO REDUCE THE AMOUNT OF CR (VI) IN A CEMENT-CONTAINING COMPOSITION AND A COMPOSITION COMPRISING CEMENT AND COATED METALLIC SULPHATE PARTICLES

摘要

A method for producing a cement-containing material, in particular a ceme nt-containing material having a low content of soluble Cr (Vl) which compris es the step of providing a cement-containing material with metallic sulphate particles coated with at least one product of the hydrolysis of a collagen material such as gelatine. It is also provided a method for reducing the con tent of Cr (Vl) in a cement-containing material and a cement-containing comp osition which comprises a cement and a metallic sulphate particles coated wi th at least one product of the hydrolysis of a collagen material. It is furt her provided the use of metallic sulphate particles coated with a collagen d erived material as an additive in a cement-containing composition.