Untersuchung und Entwicklung von Gipsmörteln für den Außenbereich unter besonderer Berücksichtigung der Wasserresistenz

The aim of this thesis was the development of gypsum-mortars (consisting of
common educts) for exterior use as mortars for restoration in historical buildings.
For exterior use the following conditions have to be fulfilled: compatibility with historical gypsum-mortars and a high water-resistence of the developed mortars
The work included the following parts:
• Investigation on historical gypsum-mortars
• Development of methods for testing the water-resistance
• Development of qualified binders and mortars
• Application of the developed mortars for historical buildings
By investigation of the historical mortars it could be showed, that the exposition of mortar in building has a great influence on the occuring damages.
Damages, which occur at these buildings, had been simulated by different wet-dry
changes in laboratory.
Due to the fact, that there is no sign of damage at the fields of application, done at the historical buildings, it seems possible to use gypsum-mortars (based on anhydrite, lime and aggregates