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1. (WO1998052882) CEMENTITIOUS GYPSUM-CONTAINING BINDERS AND COMPOSITIONS AND MATERIALS MADE THEREFROM

Pub. No.:    WO/1998/052882    International Application No.:    PCT/US1998/009157
Publication Date: Fri Nov 27 00:59:59 CET 1998 International Filing Date: Wed May 06 01:59:59 CEST 1998
IPC: A62D 1/00
C04B 28/14
Applicants: NATIONAL GYPSUM COMPANY
Inventors: STAV, Elisha
BURKARD, Edward, A.
FINKELSTEIN, Ronald, S.
WINKOWSKI, Daniel, A.
METZ, Lambert, J.
MUDD, Patrick, J.
Title: CEMENTITIOUS GYPSUM-CONTAINING BINDERS AND COMPOSITIONS AND MATERIALS MADE THEREFROM
Abstract:
Cementitious binders include calcium sulfate beta-hemihydrate, a cement component comprising Portland cement, and either silica fume or rice-husk ash. The silica fume or rice-husk ash component is at least about 92 wt.% amorphous silica and has an alumina content of about 0.6 wt.% or less.