For the restoration of historical brickwork masonry, mortars with a binder system based on sulphate-activated blast-furnace slag have been developed. This so-called SGP- or SAP-binder (slag-gypsum/anhydrite-portland cement) shows a very high sulphate resistance compared to Portland cement, portland slag cement or hydraulic limes. In order to adapt the properties of the repair mortars to those of the historical bricks and mortars, the use of additives such as polymer dispersion and methyl-cellulose was necessary. The developed mortars were successfully used for the restoration of a medieval brick building in Stralsund, Germany.
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