DEVELOPMENT OF SURFACE IN THE HYDRATION OF CALCIUM SILICATES

THE PAST HYDRATION OF BETA DICALCIUM SILICATE, TRICALCIUM SILICATE, AND ALITE WAS INVESTIGATED AT 5, 25, AND 50 C FOR PERIODS RANGING FROM 1 TO 400 DAYS. A HIGH-SURFACE CALCIUM SILICATE HYDRATE, TOBERMORITE, WAS FORMED IN ALL THESE REACTIONS, AND THE SURFACE DEVELOPMENT WAS PRIMARILY DEPENDENT ON THE DEGREE OF HYDRATION OF THE PASTE. THE STOICHIOMETRY OF THE REACTIONS WAS VARIABLE, DEPENDING ON THE ORIGINAL SILICATE, TIME, AND TEMPERATURE; AND THIS VARIATION HAD IMPORTANT EFFECTS ON SURFACE DEVELOPMENT. A LINEAR RELATIONSHIP WAS OBTAINED BETWEEN THE SURFACE AREA AND THE CALCIUM OXIDE/SILICON OXIDE RATIO OF THE TOBERMORITE. FROM THIS RELATIONSHIP AND OTHER CONSIDERATIONS, CONCLUSIONS WERE DRAWN ABOUT THE COMPOSITION AND STRUCTURE OF STABLE TOBERMORITES AS WELL AS THE COMPOSITION OF THE TOBERMORITE SURFACE. THE UNSTABLE TOBERMORITES, OBTAINED IN THE EARLY PART OF THE HYDRATION, ARE BRIEFLY DISCUSSED. /PCA/

• Authors:
  • Kantro, D L
  • Brunauer, S
  • 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; Development; Hydration; Oxides; Pastes; Silicates; Silicon compounds; Stoichiometry; Surfaces; Tobermorite
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213579
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 140
• Files: TRIS
• Created Date: Jun 1 1970 12:00AM