EP 1242329 A1 20020925 - GYPSUM-RICH PORTLAND CEMENT
Title (en)
GYPSUM-RICH PORTLAND CEMENT
Title (de)
GIPSREICHER PORTLANDZEMENT
Title (fr)
CIMENT PORTLAND RICHE EN GYPSE
Publication
Application
Priority
- US 0024621 W 20000908
- US 39432299 A 19990913
- US 53821700 A 20000330
Abstract (en)
[origin: WO0119751A1] The present invention is of a cementitious composition containing Ordinary Portland Cement (OPC), calcined gypsum, a source of amorphous silica and a source of amorphous alumina. The ratio of calcium sulfate hemihydrate to OPC is 0.7:1.0 to 1.8:1.0, the ratio of amorphous silica and amorphous alumina to OPC is 0.26:1.0 to 0.4:1.0, and the ratio of amorphous alumina to amorphous silica is 0.3:1.0 to 1.5:1.0. The cementitious composition, by itself and mixed with aggregates, is fast-setting and exhibits good early compressive strength and very high compressive strength after hydration. Despite the high content of calcium sulfate relative to prior art OPC formulations, the cementitious composition according to the present invention is essentially waterproof and exhibits excellent strength characteristics, even after 2 years under water. The use of calcined gypsum in place of alumina cement or even OPC is of great economic advantage, and in addition, provides the cementitious composition with quick-setting characteristics. Soluble anhydrite can replace some or all of the calcined gypsum.
IPC 1-7
IPC 8 full level
C04B 11/30 (2006.01); C04B 18/14 (2006.01); C04B 22/06 (2006.01); C04B 22/08 (2006.01); C04B 28/04 (2006.01); C04B 28/14 (2006.01)
CPC (source: EP)
C04B 28/145 (2013.01); Y02W 30/91 (2015.05)
C-Set (source: EP)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0119751 A1 20010322; WO 0119751 A9 20021121; AU 7124500 A 20010417; AU 766242 B2 20031009; CA 2384747 A1 20010322; EP 1242329 A1 20020925; IL 143996 A0 20020421; JP 2003509322 A 20030311; MX PA02002631 A 20031014; NZ 517474 A 20030829
DOCDB simple family (application)
US 0024621 W 20000908; AU 7124500 A 20000908; CA 2384747 A 20000908; EP 00960020 A 20000908; IL 14399600 A 20000908; JP 2001523335 A 20000908; MX PA02002631 A 20000908; NZ 51747400 A 20000908