Cementitious board manufacture

Details Cementitious board manufacture Cementitious board manufacture

C - Chemistry, Metallurgy

04

B

C04B 28/14 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2626661

A method of accelerating the setting reaction of calcium sulphate hemihydrafce and water comprises the steps of mixing water and calcium sulphate hemihydrate to produce a slurry adding an accelerator to said mixture applying ultrasonic energy to said mixture. Application of ultrasound to the plaster slurry accelerates crystallization and thus reduces the setting time. A further benefit is reduced density of the wall boards.

L'invention concerne un procédé qui permet d'accélérer la réaction de prise du sulfate de calcium hémihydraté avec l'eau. Ce procédé consiste à : mélanger l'eau et le sulfate de calcium hémihydraté pour obtenir une suspension aqueuse ; ajouter un accélérateur au mélange obtenu; et enfin, soumettre le mélange aux ultrasons.

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