THE SILICATE STRUCTURE ANALYSIS OF HYDRATED PORTLAND CEMENT PASTE
A NEW TECHNIQUE FOR RECOVERING SILICATE STRUCTURES AS TRIMETHYLSILYL DERIVATIVES HAS BEEN USED TO STUDY THE HYDRATION OF PORTLAND CEMENT. BY THIS METHOD ONLY THE CHANGES IN THE SILICATE PORTION OF THE STRUCTURE CAN BE DETERMINED AS A FUNCTION OF HYDRATION TIME. CEMENT PASTES RANGING IN AGE FROM ONE DAY TO 14.7 YEARS WERE ANALYZED FOR THE STUDY. THE HYDRATION REACTION IS SHOWN TO BE SIMILAR TO A CONDENSATION TYPE POLYMERIZATION. THE ORTHOSILICATE CONTENT OF CEMENT PASTE /WHICH PROBABLY REPRESENTS THE ORIGINAL CALCIUM SILICATES IN THE PORTLAND CEMENT/ GRADUALLY DECREASES AS THE PASTE AGES. CONCURRENTLY A DISILICATE STRUCTURE IS FORMED WHICH REACHES A MAXIMUM QUANTITY IN ABOUT FOUR WEEKS AND THEN IT TOO DIMINISHES AS THE PASTE AGES. MINOR QUANTITIES OF A TRISILICATE AND A CYCLIC TETRASILICATE ARE SHOWN TO BE PRESENT IN HYDRATED CEMENT PASTE. AN UNIDENTIFIED POLYSILICATE STRUCTURE IS PRODUCED BY THE HYDRATION REACTION WHICH NOT ONLY INCREASES IN QUANTITY THROUGHOUT THE AGE PERIOD STUDIED, BUT ALSO INCREASES IN MOLECULAR WEIGHT AS THE PASTE AGES. /AUTHOR/
- Record URL:
-
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:
- Lentz, Charles W
- Publication Date: 1966
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 269-283
- 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: Age; Hydration; Molecular weight; Pastes; Polymerization; Portland cement; Silicates; Structural analysis
- Old TRIS Terms: Trimethylsilyl derivatives
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00212282
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Nov 18 1994 12:00AM