Entstehung von fleckigen Dunkelverfärbungen an Sichtbetonoberflächen im späten Alter - Darstellung der ursächlichen Mechanismen anhand eines Praxisbeispiels

Formation of mottled dark discoloration on fairfaced concrete surfaces occuring in the late age - Description of the causal mechanisms based on a practical example

The article is focused on the phenomenon of mottled dark discoloration, which occur in the late age, i.e. months to years after the production of fairfaced concrete elements. Without countermeasure the extent of the discoloration increases time-dependent. Based on a practical example the phenomenon is described and the main mechanisms that lead to the mottled dark discoloration are shown. Finally, appropriate recommendations for preventing mottled dark discoloration in the late age are made for building practice.