STUDIES ON TOBERMORITE-LIKE CALCIUM SILICATE HYDRATES

PARALLEL STUDIES WERE CARRIED OUT ON CERTAIN CHARACTERISTICS OF CSH /I/ SYNTHESIZED AT ROOM TEMPERATURE AND ON TOBERMORITE GEL PRODUCED BY PASTE OR BOTTLE HYDRATION OF B-C2S, C3S, AND ALITE. INSTRUMENTAL METHODS EMPLOYED INCLUDED X-RAY DIFFRACTION, DTA, INFRARED SPECTROSCOPY, AND ELECTROM MICROSCOPY. SURFACE AREAS OF THE CSH /I/ SAMPLES WERE MEASURED BY WATER VAPOR ADSORPTION, AND HEATS OF ADSORPTION WERE CALCULATED. BOTH CSH /I/ AND TOBERMORITE GEL HAD NEGATIVE SURFACE CHARGE IN THE ABSENCE OF CA /OH/2. A METHOD WAS DEVISED TO MEASURE THE CATION EXCHANGE CAPACITIES OF THESE MATERIALS, WHICH WERE ON THE ORDER OF 5 TO 25 MEQ /100 GM. CSH /I/ APPEARS TO BE A DISTINCT AND REASONABLY HOMOGENEOUS PHYSICOCHEMICAL ENTITY DESPITE COMPOSITIONAL VARIATION, AND SIMILARLY THE TOBERMORITE GEL PRODUCTS APPEAR TO BE MEMBERS OF A DISTINCT PHASE REGARDLESS OF THE PARTICULAR CEMENT MINERAL OR MODE OF HYDRATION USED. THE TWO PHASES EXHIBITED SIMILAR SURFACE PROPERTIES, AND THE PRIMARY PARTICLES OF BOTH SEEMED TO BE INTRINSICALLY CEMENTED INTO MICROAGGREGATES. THE TWO PHASES ARE DIFFICULT TO DIFFERENTIATE BY X-RAY METHODS BUT MAY BE DISTINGUISHED FROM EACH OTHER BY PARTICLE MORPHOLOGY, BY THE INTENSITY OF HIGH- TEMPERATURE EXOTHERM ON DTA, AND TO SOME EXTENT, BY THEIR INFRARED SPECTRA. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1964/62/62-006.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.
• Authors:
  • Diamond, Sidney
  • Dolch, W L
  • White, Joe L
• Publication Date: 1964

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 62-79
• Monograph Title: Research on aggregate, cement, concrete and epoxy bonding
• Serial:
  • Highway Research Record
  • Issue Number: 62
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Alternatives analysis; Calcium compounds; Calculation; Cations; Differential thermal analysis; Electron microscopes; Hydrates; Hygroscopic coefficient; Infrared spectroscopy; Ion exchange; Measurement; Silicates; Surfaces; Thermal analysis; Tobermorite; X rays
• Uncontrolled Terms: Characteristics; Computation; Surface area
• Old TRIS Terms: Heat of adsorption; Ion exchange tests; X-ray diffration
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00215783
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Mar 16 1994 12:00AM