Cementitious compositions and a method of their use

Details Cementitious compositions and a method of their use Cementitious compositions and a method of their use

C - Chemistry, Metallurgy

04

B

C04B 28/06 (2006.01) C04B 40/06 (2006.01)

Patent

CA 2384853

A settable composition which can be applied by spraying to form a coating on a surface such as the walls of a mine comprises (i) a cementitious composition comprising the following components: (a) from 25 to 95% of calcium aluminate, (b) from 0 to 10% of lime and (c) from 0 to 50% of calcium sulphate, and where the sum of (b) and (c) is at least 5% the % being by weight based on the combined weight of (a), (b) and (c) and where the proportions of the components are such that the composition on hydration is capable of absorbing at least its own weight of water and (ii) an aqueous emulsion of an organic polymer, the amount of (ii) in relation to (i) being such as to provide a weight ratio of polymer, expressed as solids, to combined weight of (a), (b) and (c) of from 0.5:1 to 10:1, preferably 1:1 to 2.5:1 or (iii) a dispersible organic polymer and where the amount of dispersible polymer is such as to give a weight ratio of polymer to combined weight of (a), (b) and (c) of from 0.5:1 to 10:1, preferably 1:1 to 2.5:1. The dry composition comprising parts (i) and (iii) above can be mixed with water in the mine.

La présente invention concerne un mélange prêt à être comprimé apte à être appliqué par pulvérisation pour former un revêtement sur une surface telle les parois d'une mine, comprenant: (i) une composition cimentaire comprenant les constituants suivants: (a) entre 25 et 95 % d'aluminate de calcium, (b) entre 0 et 10 % de chaux, et (c) entre 0 et 50 % de sulfate de calcium, et dans laquelle la somme totale de (b) et (c) est au moins de 5 %, le pourcentage étant pondéral sur la base du poids combiné de (a), (b) et (c) et dans laquelle les proportions des constituants sont telles que la composition lorsqu'elle est hydratée est apte à absorber au moins son propre poids en eau et (ii) une émulsion aqueuse d'un polymère organique, la quantité de (ii) par rapport à (i) étant de sorte à produire un rapport pondéral de polymère, exprimé en solides, au poids combiné de (a), (b) et (c) compris entre 0.5: 1 et 10: 1, de préférence entre 1:1 et 2.5: 1 ou (iii) un polymère organique dispersable et dans laquelle la quantité de polymère dispersable est telle que le rapport pondéral de polymère au poids combiné de (a), (b) et (c) est compris entre 0.5:1 et 10:1, de préférence, entre 1. 1 et 2.5: 1. La composition sèche comprenant lesdites parties (i) et (iii) peut être mélangée avec l'eau dans la mine.

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