Patent ID: 8523424

Claim:
A process for reducing the set time of a settable cementitous slurry, the process comprising: providing an amount of water; providing an amount of the slurry forming substance, the slurry forming substance comprising substantially calcium sulphate hemihydrate; mixing said amount of water and said amount of slurry forming substance together at a first time to form an aqueous slurry; and re-directing a portion of said aqueous slurry formed at said first time to combine with aqueous slurry formed at a second time, thereby reducing the set time of the cementitious slurry; wherein said slurry is formed by mixing said amount of water and said amount of slurry forming substance in a mixer; wherein the mixer comprises an input and an outlet; and wherein said portion of aqueous slurry is extracted from said outlet of said mixer and re-introduced into said outlet following a time delay.