Setting and hardening accelerating agent for siliceous...

C - Chemistry – Metallurgy – 04 – B

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C04B 22/00 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2168253

Setting and hardening accelerating agent for siliceous hydraulic binders characterized in that: a) it is obtained by hydration, in the usual pressure and temperature conditions, and grinding of a siliceous hydraulic binder aqueous suspension; b) the suspension particles are sufficiently fine for the agent to meet the following test requirements: an aqueous suspension in a sedimentation specimen at 20 DEG C, containing 10 grams (dry weight) of the accelerating agent in 100 ml of water, must have a sedimentation deposit height at least equal to 50 % of the initial height at the end of two days; c) it is in the form of an aqueous suspension.

La présente invention a trait à un agent accélérateur de prise et de durcissement des liants hydrauliques siliciques, caractérisé par le fait que: a) il est obtenu par hydratation, dans des conditions habituelles de pression et de température, et broyage d'une suspension aqueuse de liant hydraulique silicique; b) les particules de la suspension sont suffisamment fines pour que l'agent satisfasse au test suivant: une suspension aqueuse, dans une éprouvette de sédimentation, à 20 °C, contenant 10 grammes (en sec) d'agent accélérateur dans 100 ml d'eau, doit avoir une hauteur de culot de sédimentation au moins égale à 50 % de la hauteur initiale au bout de 2 jours; c) il est sous forme d'une suspension aqueuse.

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