Corrosion inhibiting hydraulic cement additives and compositions containing same
AssigneeW.R. Grace & Co.-Conn.
InventorsAhmad Arfaei, Neal S. Berke, Michael P. Dallaire, Maria Hicks
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Abstract
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.
Claims15
A cementitious composition comprising:
- (a) hydraulic cement;
- (b) at least about 0.01 weight percent based upon the dry weight of said cement of a graft copolymer plasticizer comprising a polyether backbone and side chain polymers formed by polymerization of an ethylenically unsaturated monomer;
- and
- (c) at least about 0.01 weight percent based upon dry weight of said cement of an alkali or alkaline earth metal nitrite.
Dependencies are inferred from the claim text.