Rheology of Cementitious Paste with Silica Fume or Limestone
This paper studies rheological behavior of cementitious pastes where cement was increasingly replaced by densified silica fume (SF), untreated SF, or limestone. The effect of SF on flow resistance, taken as the area under the flow curve, was found to depend on dispersing ability of the plasticizer as illustrated by pastes with naphtalene sulphonate-formaldehyde condensate (SNF) and polyether grafted polyacrylate (PA). Gel strengths increased with increasing SF replacement of cement independently of plasticizer type. Cementitious gel strength was, however, dependent on the type of SF since pastes with densified SF developed lower gel strengths than pastes with untreated SF. This phenomenon was attributed to agglomerates in the densified SF which remained unbroken by the mixing and measurement sequence. Both flow resistance and gel strength decreased with increasing limestone replacement. Thus, silica fume may have an advantage over limestone filler as stabilizing agent for SCC preventing segregation upon standing and reduced form pressure due to a more rapid gel formation.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
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Supplemental Notes:
- Abstract reprinted with permission from Elsevier
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Authors:
- Vikan, H
- Justnes, H
- Publication Date: 2007-11
Language
- English
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 1512-1517
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Serial:
- Cement and Concrete Research
- Volume: 37
- Issue Number: 11
- Publisher: Elsevier
- ISSN: 0008-8846
- Serial URL: http://www.sciencedirect.com/science/journal/00088846
Subject/Index Terms
- TRT Terms: Cement; Cement paste; Flow resistance; Limestone; Rheological properties; Rheology; Silica fume
- Uncontrolled Terms: Gel strength
- Subject Areas: Highways; Materials; I32: Concrete;
Filing Info
- Accession Number: 01084653
- Record Type: Publication
- Files: TRIS
- Created Date: Jan 28 2008 8:10AM