Settable cementitious compositions

Details Settable cementitious compositions Settable cementitious compositions

C - Chemistry, Metallurgy

04

B

261/45

C04B 7/00 (2006.01) C04B 7/32 (2006.01) C04B 28/06 (2006.01)

Patent

CA 1248557

- 31 - SETTABLE CEMENTITIOUS COMPOSITIONS Abstract A settable cementitious composition is produced by mixing a ground mineral composition containing the phase 4CaO.3A12O3.SO3, in the presence of water, with a source of alkali metal or alkaline earth metal under alkaline conditions. In the pump packing method of stowing cavities in underground mines, an aqueous slurry of the mineral composition is mixed with a second slurry containing calcium sulfate, lime and, preferably, bentonite, an alkali metal sulfate and a setting and/or hardening accelerator. The components may be provided initially as a dry mixture. A preferred mineral composition comprises at least 15% by weight of 4CaO.3Al2- O3.SO3, less than 1% by weight of free lime, less than 25% by weight of CaO.2A12O3 and not more than 10% by weight of 12CaO.7Al2O3.

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