THE SURFACE ENERGY OF TOBERMORITE

THE TOTAL SURFACE ENERGY (OR SURFACE ENTHALPY) OF A CALCIUM SILICATE HYDRATE, TOBERMORITE, WAS DETERMINED AT 23.5 C. THE TOBERMORITE WAS OBTAINED FROM THE ROOM-TEMPERATURE HYDRATION OF TRICALCIUM SILICATE OR BETA-DICALCIUM SILICATE. THE HYDRATION REACTIONS WERE CARRIED OUT IN THREE DIFFERENT WAYS, AND 14 PREPARATIONS WERE OBTAINED. FOR EACH PREPARATION THE HEATS OF SOLUTION WERE MEASURED AT 23.5 C, AND THE SURFACE AREAS WERE DETERMINED BY THE B.E.T. METHOD, USING WATER VAPOR AT 25 C. THE SURFACE ENERGY OF TOBERMORITE AT 23.5 C WAS FOUND TO BE 386 PLUS OR MINUS 20 ERGS/SQ CM. IT IS CLOSE TO THE GEOMETRIC MEAN OF THE SURFACE ENERGIES OF CALCIUM HYDROXIDE AND HYDROUS AMORPHOUS SILICA, PREVIOUSLY REPORTED. NITROGEN ADSORPTION DID NOT MEASURE THE TRUE SURFACE AREA OF MOST TOBERMORITE PREPARATIONS. /PCA/

• Authors:
  • Brunauer, S
  • Kantro, D L
  • Weise, C H
• Publication Date: 0

Media Info

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

Subject/Index Terms

• TRT Terms: Calcium compounds; Hydrates; Hydration; Hydroxides; Silicates; Surface energy; Surfaces; Tobermorite
• Uncontrolled Terms: Surface area
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213548
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 105
• Files: TRIS
• Created Date: Jun 1 1970 12:00AM