INTERACTIONS OF ORGANIC COMPOUNDS IN PORTLAND CEMENT PASTES

A REVIEW OF THE LITERATURE LEADS TO THE CONCLUSION THAT TRICALCIUM ALUMINATE CAN COMBINE WITH CALCIUM SALTS OF BOTH LOW AND HIGH MOLECULAR WEIGHT ORGANIC ACIDS TO YIELD COMPOUNDS SIMILAR TO COMPOUNDS FORMED WITH CALCIUM SALTS OF INORGANIC ACIDS. IT IS SUGGESTED THAT THE SO-CALLED ADSORPTION OF SUCH ORGANIC SALTS BY TRICALCIUM ALUMINATE IS ACTUALLY A CHEMICAL REACTION WITH THE FORMATION OF THESE COMPLEX SALTS. ON THE OTHER HAND, IT APPEARS THAT BI- AND TRICALCIUM SILICATES DO NOT UNDERGO SIMILAR REACTIONS WITH THESE ORGANIC SALTS, BUT DO ADSORB THEM BY EITHER IONIC OR HYDROGEN BONDING IN A REVERSIBLE MANNER. THIS MAKES IT POSSIBLE FOR TRICALCIUM ALUMINATE TO REMOVE THESE MATERIALS FROM THE SURFACES OF THE CALCIUM SILICATES AND THUS TERMINATE THE RETARDING ACTIONS OF THESE ADMIXTURES IN CEMENT PASTES. /AUTHOR/

• Supplemental Notes:
  • Vol 5, No 4, PP 842-855, 3 TAB, 22 REF
• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • Hansen, W C
• Publication Date: 1970-12

Media Info

• Serial:
  • Journal of Materials
  • Publisher: American Society for Testing and Materials (ASTM)

Subject/Index Terms

• TRT Terms: Adsorption; Alkali aggregate reactions; Calcium; Cement additives; Cement paste; Hydration; Organic compounds; Pastes; Portland cement; Salts; Silicates
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213860
• Record Type: Publication
• Files: TRIS
• Created Date: May 3 1971 12:00AM