Corrosion inhibiting hydraulic cement additives and compositions containing same
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United States of America Patent
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Aug 7, 1990
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N/A
app pub date -
Sep 7, 1989
filing date -
Sep 7, 1989
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Expired
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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.
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