Developing Falling-Ball Viscometer for Highly Flowable Cement-Based Materials
Northwestern University's Center for Advanced Cement-Based Materials designed and developed a scale, suspended steel ball, and spring based falling-ball viscometer to measure cement-based materials' rheological properties. By investigating the relationship between falling-ball velocity and drag force exerted on ball surface, the viscometer can determine a fluid's yield stress and plastic viscosity. The authors discuss a two-step study. The first step investigated paste properties when water-cement ratio was the same but high-range water-reducing admixtures and viscosity-modifying admixture contents varied. The second stage researched the same paste matrix with varied sand content mortars. Study results showed that mixture composition variation changes could be measured by the falling-ball viscometer. The mini-cone slump test determined slump flow diameter, which corresponded very well to measured yield stress. Viscometer application to high fluidity concretes, such as self-consolidating concrete, has high potential.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
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Authors:
- Sun, Zhihui
- Gregori, Amedeo
- Ferron, Raissa
- Shah, Surendra P
- Publication Date: 2007
Language
- English
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 180-186
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Serial:
- ACI Materials Journal
- Volume: 104
- Issue Number: 2
- Publisher: American Concrete Institute (ACI)
- ISSN: 0889-325X
- Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx
Subject/Index Terms
- TRT Terms: Admixtures; Cement; Drag forces; Falling; Flow; Fluidity; Mortar; Plastic deformation; Rheological properties; Self compacting concrete; Velocity; Viscometers; Water cement ratio
- Uncontrolled Terms: Balls; Slump
- Subject Areas: Highways; Materials; I32: Concrete;
Filing Info
- Accession Number: 01049881
- Record Type: Publication
- Files: TRIS
- Created Date: May 4 2007 11:14AM