C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/56.4
C04B 24/32 (2006.01) C04B 22/08 (2006.01) C04B 28/04 (2006.01) E02F 3/84 (2006.01)
Patent
CA 2023830
An additive combination for hydraulic cement compositions is provided which advantageously provides corrosion inhibition and set acceleration, in combination with a high level of fluidity and retention of fluidity over a desired period of time. The cement additive combination comprises an alkali or alkaline earth metal nitrite and a graft copolymer plasticizer comprising a polyether backbone and side chain polymers formed by polymerization of ethylenically unsaturated monomers. Fluid hydraulic cement compositions are further provided comprising these additive combinations.
L'invention porte sur une combinaison additive pour compositions de ciment hydraulique, qui offre les avantages suivants : inhibition de la corrosion et prise accélérée, combinées à un taux élevé de fluidité et à la rétention de la fluidité pendant la période de temps voulue. La combinaison additive de ciment est composée d'un nitrite de métal alcalin ou alcalino-terreux et d'un plastifiant à base de copolymère de greffe, comprenant un squelette de polyéther et des polymères, sous forme de ramifications latérales, de monomères éthyléniquement insaturés. L'invention porte enfin sur des compositions de ciment hydraulique fluides, renfermant ces combinaisons additives.
Arfaei Ahmad
Berke Neal S.
Dallaire Michael P.
Hicks Maria
Smart & Biggar
W.r. Grace & Co.,-Conn.
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