Global Patent Index - EP 1242329 A1

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

EP 1242329 A1 20020925 (EN)

Application

EP 00960020 A 20000908

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

C04B 11/30; C04B 14/10; C04B 14/36

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)

  1. C04B 28/145 + C04B 7/02 + C04B 18/025 + C04B 18/101
  2. C04B 28/145 + C04B 7/02 + C04B 14/106 + C04B 18/141 + C04B 20/0048

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