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Interactions Between Cement Minerals and Hydroxycarboxylic‐Acid Retarders: I, Apparent Adsorption of Salicylic Acid on Cement and Hydrated Cement Compounds
Author(s) -
DIAMOND SIDNEY
Publication year - 1971
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1971.tb12289.x
Subject(s) - cement , salicylic acid , adsorption , ettringite , chemistry , aluminate , inorganic chemistry , aqueous solution , nuclear chemistry , retarder , calcium , mineralogy , portland cement , materials science , organic chemistry , metallurgy , biochemistry , composite material
A radioisotope assay method was developed to measure the apparent adsorption of salicylic acid on cement and hydrated cement compounds at concentrations of salicylic acid in aqueous solution up to 0.2 wt%, thus including the range of concentrations used for hydroxycarboxylic‐acid retarders in concrete. Previously published data were available only for concentrations below 0.01%. The results confirm that there is only limited apparent adsorption on dicalcium and tricalcium silicates, whereas apparent adsorption on paste‐ and bottle‐hydrated products of these compounds is significant. Apparent adsorption on tricalcium aluminate is strong and is greater at intermediate concentrations than near saturation. A similar pattern was observed for apparent adsorption on “C 4 AF,” but the amounts removed from solution were much less. Experiments with C 4 AH 13 , C 3 AH 0 , and ettringite revealed that hydrated calcium aluminate and aluminate sulfate compounds also remove major amounts of salicylic acid from solution.