Magnesium phosphate fast-setting cementitious compositions...

Details Magnesium phosphate fast-setting cementitious compositions... Magnesium phosphate fast-setting cementitious compositions...

C - Chemistry, Metallurgy

04

B

261/84

C04B 9/00 (2006.01) C04B 28/34 (2006.01)

Patent

CA 1277343

MAGNESIUM PHOSPHATE FAST-SETTING CEMENTITIOUS COMPOSITIONS CONTAINING SET RETARDANTS ABSTRACT OF THE DISCLOSURE Improved magnesium phosphate fast-setting cementi- tious compositions containing a synergistic combination of an oxy-boron compound and hydroxycarboxylic acid, or its salt or acid derivative. These compositions form a hardened mass when water is added at ambient temperatures. The incorporation of the oxy-boron compound and hydroxy- carboxylic acid, or its salt or acid derivative within these compositions retards the initial setting time, increases the early compressive strength of the resulting hardened mass by allowing a reduced amount of water to be added to the compositions and increases the final compressive strength. These compositions include a solid activator containing a P2O5 material, e.g. ammonium phosphate fertilizer, absorbed onto a porous material, e.g. diatomaceous earth.

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