THE EFFECT OF PHOSPHATE IN PORTLAND CEMENT CLINKER

RECENT STUDIES RELATING TO THE EFFECT OF PHOSPHATE IN PORTLAND CEMENT CLINKER ARE REVIEWED. NURSE HAS PRESENTED STRONG EVIDENCE THAT THE PHOSPHORIC OXIDE IS IN SOLID SOLUTION AS A CALCIUM PHOSPHATE IN THE DIACALCIUM SILICATE PHASE, AND, THAT IN LIME-SATURATED CLINKER, THE APPROXIMATE COMPOSITION OF THIS PHASE IS 7.0 PERCENT PHOSPHORIC OXIDE, 26.5 PERCENT SILICON OXIDE, 66.5 PERCENT CALCIUM OXIDE. DATA OF OTHER INVESTIGATORS ARE IN SUFFICIENT AGREEMENT AND IT IS CONCLUDED THAT EQUATIONS DEVELOPED BY NURSE PROVIDE A RATIONAL BASIS FOR DESIGN OF RAW MIX. PHOSPHATE IN CLINKER REDUCES BOTH THE LIME LIMIT AND THE MAXIMUM POSSIBLE TRICALCIUM SILICATE CONTENT; HOWEVER, WITH PROPER MIX DESIGN, 2 PERCENT PHOSPHORIC OXIDE IN CLINKER CAN APPARENTLY BE TOLERATED, AND SOMETIMES CONSIDERABLY MORE. /PCA/

• Authors:
  • Steinour, H H
• Publication Date: 0

Media Info

• Serial:
  • Portland Cement Assoc R & D Lab Bull
  • Issue Number: 0

Subject/Index Terms

• TRT Terms: Calcium compounds; Calcium oxide; Clinkers; Oxides; Phosphates; Portland cement; Silicates; Silicon compounds
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213531
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 85
• Files: TRIS
• Created Date: May 25 1970 12:00AM