High bond strength cement additives
AssigneeWestvaco Corporation
InventorsBruce T. Wright, Peter Schilling
Life of this patent
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Abstract
A hydraulic cement mix including hydraulic cement, aggregate, sufficient water to effect hydraulic setting of the cement, and a polyamidoamine additive, the additive being present in an amount sufficient to increase the bonding strength of the hardened mix. Generally, the additive is present in a total amount of about 0.025 to 0.25% by weight based upon the weight of the cement, preferably in an amount in the range of about 0.075 to 0.15% by weight.
Claims9
A hydraulic cement mix comprising a hydraulic cement, aggregate in an amount of up to 80 percent by weight based upon the total weight of said cement mix, sufficient water to effect hydraulic setting of the cement, and a polyamidoamine additive comprising the reaction product of:
- (a) a polymerization reaction wherein 1-99% by weight of a member selected from the group consisting of styrene, .alpha.-methyl styrene, and combinations thereof is reacted with 1-99% by weight of acrylic acid to produce a copolymer;
- and
- (b) a further condensation reaction wherein 20-80% by weight of said copolymer is reacted with 20-80% by weight of a polyamine dissolved in a polyglycol solvent to produce the polyamidoamine additive,
- wherein said polyaminoamine additive is present in an amount sufficient to increase the bonding strength of the hardened cement mix.
Dependencies are inferred from the claim text.