ACCELERATION AND RETARDATION OF PORTLAND CEMENT HYDRATION BY ADDITIVES
THE MECHANISM OF ACCELERATOR AND RETARDER ACTION UPON SETTING AND HARDENING OF PORTLAND CEMENT WAS INVESTIGATED. TESTS WERE CONDUCTED ON CEMENT AND ON A SYNTHETIC SILICATE BINDER, USING ANHYDROUS CALCIUM CHLORIDE AS THE ACCELERATOR AND THE CITRIC ACID AS THE RETARDER. FINDINGS SHOWED THAT THE RATE OF HYDRATION OF THE SILICATE PHASE /I.E. RATE OF FORMATION OF TOBERMORITE GEL/ IS CHANGED BY ADDITIVES. /PREVIOUS HYPOTHESES HAD STRESSED THAT THE SILICATE PHASE REMAINED UNAFFECTED./ INSOLUBLE COMPOUNDS WITH CLINKER ALUMINATES ARE FORMED DURING THE PROCESS. THERMAL AND HEAT-ON-SETTING EXPERIMENTS ARE CONSISTENT WITH THESE CONSIDERATION. THE EFFECT OF MIXING SEQUENCE USING RETARDERS AND ACCELERATORS IS EXPLAINED.
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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
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Corporate Authors:
Highway Research Board (HRB)
Washington, DC -
Authors:
- Tamas, Ferenc D
- Publication Date: 1966
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 392-397
- Monograph Title: Symposium on structure of Portland cement paste and concrete
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Serial:
- Highway Research Board Special Report
- Issue Number: 90
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Accelerators (Devices); Cement additives; Crash investigation; Hydration; Laboratory tests; Mixing; Portland cement; Rates; Retarders (Concrete); Studies; Temperature measurement
- Old TRIS Terms: Accelerators; Mixing procedures; Retarders
- Subject Areas: Highways; Materials; Safety and Human Factors;
Filing Info
- Accession Number: 00212290
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Nov 18 1994 12:00AM