STOICHIOMETRY OF TRICALCIUM SILICATE HYDRATION

TRICALCIUM SILICATE WAS HYDRATED WITH VARIOUS WATER ADDITIONS BETWEEN 0.25 AND 2.0 G H20/GC3S. THE CRUSHED SAMPLES WERE ANALYZED AFTER HYDRATION TIMES OF UP TO 180 DAYS. THE UNHYDRATED TRICALCIUM SILICATE WAS DETERMINED BY X-RAY DIFFRACTION METHOD, THE CALCIUM HYDROXIDE WAS DETERMINED CHEMICAL-ANALYTICALLY AND THERMOGRAVIMETRICALLY, AND THE NON EVAPORABLE WATER BY DRYING IN VACUUM WITH A WATER VAPOR PARTIAL PRESSURE OF ICE AT -79 C. THE CHEMICAL ANALYSIS OF THE CALCIUM HYDROXIDE YIELDED VALUES THAT WERE ABOUT 35 PERCENT HIGHER THAN THOSE OBTAINED BY THE THERMOGRAVIMETRIC METHOD. FROM THE CALCIUM HYDROXIDE CONTENT AND THE DEGREE OF HYDRATION IT WAS POSSIBLE TO ESTABLISH THE LIME CONTENT OF THE CALCIUM SILICATE HYDRATES FORMED DURING HYDRATION. AT THE BEGINNING OF HYDRATION POORER-IN-WATER HYDRATION PRODUCTS OCCUR WHILE RICHER-IN-WATER HYDRATION PRODUCTS ARE PRESENT IN COMPLETELY HYDRATED SAMPLES. THE LINEAR RELATIONSHIP BETWEEN COMBINED WATER AND DEGREES OF HYDRATION WOULD APPEAR TO INDICATE THAT THE ONLY DIFFERENCE BETWEEN LOW-LIME AND HIGH-LIME CALCIUM SILICATE HYDRATES LIES IN THE DIFFERENT CALCIUM HYDROXIDE CONTENT. IT IS PRESUMED THAT THE HIGH-LIME CALCIUM SILICATE HYDRATES CONSIST OF TOBERMORITE-LIKE LAYERS WITH ATTACHED CALCIUM HYDROXIDE LAYERS.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/sr/sr90/90-026.pdf
• Supplemental Notes:
  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Corporate Authors:

  Highway Research Board (HRB)

  Washington, DC   
• Authors:
  • Locher, F W
• Publication Date: 1966

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: p. 300-308
• Monograph Title: Symposium on structure of Portland cement paste and concrete
• Serial:
  • Highway Research Board Special Report
  • Issue Number: 90
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Calcium compounds; Calcium oxide; Chemical analysis; Crushing; Diffraction; Gravimetric analysis; Hydration; Hydroxides; Samples; Silicates; Stoichiometry; Water; X rays
• Uncontrolled Terms: X-ray diffraction
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00212462
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Dec 12 2001 12:00AM