METHOD OF CONTROLLING THE HYDRATION BEHAVIOUR OF GIPSUM IN THE MANUFACTURE OF COMPOSITE MATERIALS

METHOD OF CONTROLLING THE HYDRATION BEHAVIOUR OF GIPSUM IN THE MANUFACTURE OF COMPOSITE MATERIALS

PCT No. PCT/DE94/00718 Sec. 371 Date Mar. 20, 1996 Sec. 102(e) Date Mar. 20, 1996 PCT Filed Jun. 23, 1994 PCT Pub. No. WO95/01942 PCT Pub. Date Jan. 19, 1995A method of controlling the ratio of hydration time (HT) to open time (OT) in the manufacture of composite materials from a mixture containing...

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Bibliographische Detailangaben
Hauptverfasser: SCHMELMER,BERNHARD, SATTLER,HEINZ, THOLE,VOLKER
Format: Patent
Sprache:eng
Schlagworte:
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Zusammenfassung:PCT No. PCT/DE94/00718 Sec. 371 Date Mar. 20, 1996 Sec. 102(e) Date Mar. 20, 1996 PCT Filed Jun. 23, 1994 PCT Pub. No. WO95/01942 PCT Pub. Date Jan. 19, 1995A method of controlling the ratio of hydration time (HT) to open time (OT) in the manufacture of composite materials from a mixture containing hydratable calcium sulphate such as gypsum binders, aggregates, fibers, water additives and other additives is disclosed. The method includes adding a retarder-accelerator combination such as Retardan and potassium sulphate to the mixture and applying pressure. The retarder-accelerator combination and application of pressure provide advantageous reduction in the ratio HT:OT. More particularly, HT:OT can be reduced to less than 1.