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Technical effects on concrete of chromatereduction in cement

The influence of cement composition on fresh and hardened concrete


Under the European Directive 2003/53/EC, since January 2005 only cement containing less than 2 ppm of water-soluble chromate may be sold and used. Normally, adherence to the upper limit for chromate is guaranteed during cement manufacture by the specific addition of a chromate reducer. The quantitatively most frequently employed chromate reducing compound is iron(II) sulphate. This paper summarises research results and experience which were acquired both in the run up to the changeover and during just under two years of practical application. This comprises an examination of the effects of iron(II) sulphate on the reaction properties of cement and the associated characteristics of fresh and hardened concrete.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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