INTERACTIONS BETWEEN CEMENT MINERALS AND HYDROXYCARBOXYLIC- ACID RETARDERS: I, APPARENT ADSORPTION OF SALICYLIC ACID ON CEMENT AND HYDRATED CEMENT COMPOUNDS

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 TETRACALCIUM ALUMINOFERRITE BUT THE AMOUNTS REMOVED FROM SOLUTION WERE MUCH LESS. EXPERIMENTS WITH HYDRATED TETRACALCIUM ALUMINATE, HYDRATED TRICALCIUM ALUMINATE, AND ETTRINGITE REVEALED THAT HYDRATED CALCIUM ALUMINATE AND ALUMINATE SULFATE COMPOUNDS ALSO REMOVE MAJOR AMOUNTS OF SALICYLIC ACID FROM SOLUTION. /AUTHOR/

• Supplemental Notes:
  • Vol 54, No 6, PP 273-276, 7 FIG, 7 REF
• Authors:
  • Diamond, S
• Publication Date: 1971-6

Media Info

• Serial:
  • American Ceramic Society Journal
  • Publisher: f Public Works

Subject/Index Terms

• TRT Terms: Adsorption; Cement; Chemical analysis; Hydrates; Inorganic compounds; Kinetics; Motor reactions; Organic compounds; Physical chemistry; Portland cement; Portland cement concrete; Radioactive materials; Retarders (Concrete)
• Old TRIS Terms: Reaction kinetics; Retarders
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213990
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 6 1971 12:00AM