E - Fixed Constructions – 04 – C
Patent
E - Fixed Constructions
04
C
261/73
E04C 5/07 (2006.01) C04B 28/14 (2006.01)
Patent
CA 1134397
ABSTRACT Materials formed from plaster gypsum mixtures have not been used as load bearing materials due to their loss of strength when contacted with water. It is known to coat such materials with water-repellent but this requires an additional drying step. Additionally such a coating leads to a product which does not have uniform properties over its entire surface. As a result there are no commercial process for manufacturing load bearing water- repellent plaster-gypsum objects. The present invention overcomes this draw back by providing a process for preparing a water-repellent material from a gypsum plaster mix comprising mixing in any sequence plaster and gypsum, to provide a mixture comprising from about 30 to about 99% by weight plaster, water in an amount to provide an excess of up to 15% over the stoichiometric amount required for the setting of the gypsum plaster mix; and from about .2 to 2% of a water-repellent agent which is at least one metallic salt of a long chain fatty acid; placing the resulting mixture in a mould and subjecting it to a pressure of up to about 700 kg/cm2 for a time sufficient to cause the mixture to retain the shape of the mould, and removing the mixture from the mould without drying.
320515
Rhone-Poulenc Industries
Smart & Biggar
LandOfFree
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