SIGNIFICANCE OF TOTAL AND WATER-SOLUBLE ALKALI CONTENTS OF PORTLAND CEMENT

THE PORTION OF THE ALKALIES IN THE CLINKER THAT ARE WATER SOLUBLE DEPENDS ON THE FORM OF THE ALKALIES, WHICH IN TURN DEPENDS ON THE CHEMICAL COMPOSITION OF THE RAW MIX AND THE CONDITIONS DURING THE BURNING OPERATION. IT WAS FOUND THAT THE AMOUNT OF THE ALKALIES THAT ARE WATER SOLUBLE CAN VARY FROM LESS THAN 10 TO OVER 60 PER CENT OF THE TOTAL ALKALI CONTENT. IN SOME CASES A BETTER CORRELATION WAS OBTAINED BETWEEN THE SOLUBLE ALKALI CONTENT AND THE AMOUNT OF MORTAR EXPANSION THAN BETWEEN THE TOTAL ALKALI CONTENT AND THE AMOUNT OF EXPANSION. SOLUBLE ALKALIES WERE FOUND TO HAVE A SIGNIFICANT EFFECT ON THE RATE OF HYDRATION BUT NOT ON THE PH OF THE AQUEOUS EXTRACT FROM CEMENT PASTES. EVEN AFTER HYDRATION AT ROOM TEMPERATURE FOR ONE YEAR, A CONSIDERABLE PORTION OF THE ALKALIES IN CEMENT MAY NOT BE WATER SOLUBLE. /AUTHOR/

• Supplemental Notes:
  • Vol 3, No 3, PP 684-694, 3 FIG, 6 TAB, 7 REF
• Authors:
  • McCoy, W J
  • Eshenour, O L
• Publication Date: 1968-9

Media Info

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

Subject/Index Terms

• TRT Terms: Alkali; Chemical composition; Clinkers; Expansion; Hydration; pH value; Portland cement; Solubility; Water
• Old TRIS Terms: Alkalies
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213264
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 24 1994 12:00AM