Optimum mixture proportions for concretes containing fly ash ...
Optimum mixture proportions for concretes containing fly ash ...
Abstract:
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Concretes with equal water/cement ratios and equal paste volumes of various combinations of cement, fly ash, and silica fume were tested to establish parameters for strength and chloride permeability. Comparative specimens with Type II and Type III cement were tested. The effects of temperature and moisture availability during curing were also evaluated. In general, the laboratory tests showed that, when adequate curing in the 73°F to 100 °F temperature range is provided, concretes with satisfactory early and 28-day strengths and good resistance to chloride ion penetration can be obtained with either type of cement and various combinations of fly ash and silica fume. The cementitious material can be in the range of 30 to 35 percent fly ash and 5 percent silica fume, based on the weight of the cementitious material. Similar specimens cured at 43°F generally did not develop an adequate early strength, and the chloride permeability was high. Combinations of the pozzolans with Type III cement yielded higher strengths and a lower chloride permeability than did similar combinations with Type II cement.
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OPTIMUM SILICA FUME CONTENT AND ITS MODE OF ...
OPTIMUM SILICA FUME CONTENT AND ITS MODE OF ACTION ON CONCRETE
The aim of this paper is to develop a better understanding of the isolated contribution of silica fume on concrete and determine its optimum content. There is much debate among researchers as to the mode of action of silica fume on the mechanism of strength development and its optimum replacement percentage. Extensive experimentation was conducted over water-binder ratios ranging from 0.26-0.42 and silica fume-binder ratios from 0.0-0.3. Results indicate that the optimum replacement percentage for 28-day strength is not a constant one, but depends on the water-cementitious material ratio of the mixture and has been found to range from 15-25%. On quantifying the pozzolanic and physical effects of silica fume, it is observed that both mechanisms significantly contribute to the concrete strength.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
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Corporate Authors:
American Concrete Institute (ACI)
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Authors:
- Bhanja, S
- Sengupta, B
- Publication Date: 2003-9
Language
- English
Media Info
- Features: References; Tables;
- Pagination: p. 407-412
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Serial:
- ACI Materials Journal
- Volume: 100
- Issue Number: 5
- Publisher: American Concrete Institute (ACI)
- ISSN: 0889-325X
- Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx
Subject/Index Terms
Filing Info
- Accession Number: 00964513
- Record Type: Publication
- Files: TRIS
- Created Date: Oct 9 2003 12:00AM
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