INVESTIGATION OF THE FRANKE METHOD OF DETERMINING FREE CALCIUM HYDROXIDE AND FREE CALCIUM OXIDE

THE FRANKE METHOD (OR ACETOACETIC ESTER METHOD) FOR THE DETERMINATION OF UNCOMBINED CALCIUM HYDROXIDE AND CALCIUM OXIDE IN THE PRESENCE OF HYDRATED AND ANHYDROUS SUBSTANCES WAS INVESTIGATED. REPEATED EXTRACTIONS GAVE THE CORRECT VALUES FOR CALCIUM HYDROXIDE IN THE PRESENCE OF A CALCIUM SILICATE HYDRATE IN WHICH THE CALCIUM WAS FIRMLY BOUND; HOWEVER, SOME CALCIUM WAS REMOVED FROM ANOTHER CALCIUM SILICATE HYDRATE IN WHICH THE BINDING WAS WEAKER. A MODIFICATION OF THE METHOD GAVE ACCURATE RESULTS FOR FREE LIME IN ANHYDROUS SUBSTANCES, SUCH AS PORTLAND CEMENTS. THE PRECISION OF THE FRANKE METHOD WAS ABOUT THE SAME AS THAT OF THE LERCH AND BOGUE METHOD (OR GLYCEROL-ALCHOHOL METHOD), BUT THE FORMER PRESENTED CERTAIN ADVANTAGES. /PCA/

• Authors:
  • Pressler, E E
  • Brunauer, S
  • Kantro, D L
• Publication Date: 0

Media Info

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

Subject/Index Terms

• TRT Terms: Calcium compounds; Hydrates; Hydroxides; Oxides; Portland cement; Silicates; Test procedures
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213511
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 62
• Files: TRIS
• Created Date: May 25 1970 12:00AM