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US 4,391,645 AGranted
Additives for cementitious materials
AssigneeDiamond Shamrock Corporation
InventorsAlphonso W. Marcellis, Grannis S. Johnson
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Abstract
Superplasticizers with improved water reducing properties for cement, cement slurries, mortar, grout and concrete are formed from synergistic mixtures of (1) aromatic sulfonic acid formaldehyde condensates, such as the sodium salt of naphthalene sulfonic acid formaldehyde condensate and (2) hydroxy aromatic compounds such as pyrogallol and gallic acid. Addition of these mixtures to the same cementitious materials also results in improved compressive strength.
Claims17
An additive for cementitious materials comprising:
- (a) at least one salt of aromatic sulfonic acid formaldehyde condensate, and
- (b) at least one hydroxy aromatic compound selected from:
- ##STR7## where X is --OH or --O Cation, a is 1,2 or 3,
- Y is ##STR8## b is 0, 1, 2 or 3 with the proviso that where a is 1, b is 1, R is --H or lower alkyl,
- Z is --OH, --O Cation, ##STR9## R' is --H or lower alkyl and c is 0, 1, 2 or 3 and ##STR10## where X is --OH or --O Cation, a is 1, 2 or 3, n is a whole number of 1 to 6 and ##STR11## with the proviso that when n does not completely satisfy all of the bonds of R", the remaining bonds are satisfied with --OH.
2 more elements
Dependencies are inferred from the claim text.