Binder composition

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 28/10 (2006.01) C04B 22/06 (2006.01)

Patent

CA 2727072

This invention relates to a cement binder composition and to the use of the binder composition in construction products. The cement binder composition is based on MgO that absorbs CO2 when hardening. The binder composition of the present invention also comprises at least one magnesium carbonate (either hydrated or unhydrated) having the formula xMgCO3- yMg(OH)2- zH2O, wherein x is at least 1, and at least one of y or z is greater than 0. The binder composition may optionally comprise a hydroscopic material, for example NaCI. The MgO when mixed with water in the presence of the magnesium carbonate produces magnesium hydroxide that has a rosette-like morphology (as shown).

La présente invention concerne une composition de liant de ciment et lutilisation de la composition de liant dans des produits de construction. La composition de liant de ciment est à base de MgO qui absorbe le CO2 lorsquelle durcit. La composition de liant de la présente invention comprend également au moins du carbonate de magnésium (soit hydraté ou non hydraté) de la formule xMgCO3- yMg(OH)2- zH2O, dans laquelle x vaut au moins 1, et au moins un parmi y ou z est supérieur à 0. La composition de liant peut éventuellement comprendre un matériau hygroscopique, par exemple du NaCl.  Lorsque mélangé avec de leau en présence du carbonate de magnésium, le MgO produit de lhydroxyde de magnésium qui possède une morphologie de type rosette (comme montrée).

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