Cement composition for self-levelling concrete and...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 24/38 (2006.01) C04B 24/32 (2006.01) C04B 28/02 (2006.01) C04B 28/04 (2006.01)

Patent

CA 2694611

The invention relates to a cement composition for a self-levelling concrete, that comprises a mixture of rheology-modifying additives, characterised in that it comprises the combination of at least a first agent for substantially increasing the shear threshold of the concrete in the fluid state, selected from a natural polysaccharide ether, a hydroxyalkyl guar ether, a hydroxyethylcellulose or a hydroxypropyl guar, which are hydrophobically modified with the introduction of hydrophobic side grafts, and at least a second viscosity-increasing agent for substantially increasing the viscosity of said concrete in the fluid state, selected from a non-hydrophobically-modified hydroxyalkylcellulose having a degree of polymerisation between approximately 500 and approximately 4500 and a viscosity of less than 50 PA.s in aqueous solution at 2 wt.-% and a poly (ethylene oxide), in order to limit or prevent the dynamic segregation of granulates in the concrete during the implementation thereof. The use of such a composition can replace the presence of a filler in the concrete, in particular a self-levelling concrete, without diminishing the performance concerning the spreading thereof, the sieve stability, the bleeding and the dynamic segregation relative to a concrete containing a filler, in particular a concrete having the same water/cement ratio.

La composition cimentaire pour béton autoplaçant renferme un mélange d'adjuvants modificateurs de rhéologie caractérisée en ce qu'elle comprend la combinaison d'au moins un premier agent augmentant de façon prépondérante le seuil de cisaillement du béton l'état fluide choisi parmi un éther de polysaccharide naturel, un éther d'hydroxyalkylguar, une hydroxyéthylcellulose ou un hydroxypropylguar, modifiés hydrophobes par intorduction de greffons latéraux hydrophobes et d'au moins un second agent viscosant augmentant de façon prépondérante la viscosité dudit béton à l'état fluide choisi parmi une hydroxyalkylcellulose, non modifiée hydrophobe, à degré de ploymérisation compris entre 500 environ et 4500 environ, présentant une viscosité inférieure à 50 PA. s en solution auqueuse à 2% en poids, et un poly (oxyde d' éthylène), en vue de limiter ou empêcher la ségrégation dynamique des granulats dans le béton lors de sa mise en oeuvre L'utilisation d'une telle composition permet de s'affranchir de la présence de filler dans un béton, notamment un béton autoplaçant, sans réduction des performances relatives à l'étalement, à la stabilité au tamis, au ressuage, et à la ségrégation dynamique, par rapport à un béton avec filler, notamment à un béton à même rapport eau/ciment.

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