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1997
Journal Article
Titel
Bedeutung der Porosität für die Eigenschaften von Gipserhärtungsprodukten
Alternative
The importance of porosity for the properties of hardened gypsum plaster products
Abstract
The importance of porosity for the properties of hardened gypsum plaster products. The porosity of the plaster matrix plays a central part in the mechanical properties of gypsum plaster building components. It correlates with the various properties (ME) through a function of the type: n ME =(1-p) for n = 2,5...3,5 in wich K is a material constant for the pore-free state (p = 0). Normal commercial gypsum plaster building components wich are made from _-hemihydrate binders habe porosities between 0,45 and 0,55. The corresponding property values can be improved by a factor of more than 3 by halving the porosity. However, practical implementation of these results requires different production processes which will allow the water/plaster ratio to be lowered to values around 0,3. Water/plaster ratios of < 0,25 have already been achieved on an experimental basis. For the same porosity gypsum plaster products made from a- and -hemihydrate have practically the same mechanical properties.