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New Methodology For Designing Self-Compacting Concrete

Aaron W. Saak, H. Jennings, S. Shah
Published 2001 · Materials Science

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This paper introduces a new segregation-controlled design methodology for self-compacting concrete (SCC). The theory suggests that aggregate segregation is governed by the yield stress, viscosity, and density of the cement paste matrix. The concept of a rheological self-flow zone for concrete is also introduced, where aggregate segregation is avoided, yet the concrete has a high workability. The applicability of the theory is studied by systematically changing the rheology of the cement paste matrix of fresh concrete. The yield stress and viscosity of 3 different types of pastes incorporating silica fume and a cellulose thickening agent are measured as a function of density. Results suggest that the new segregation control design theory can be used to produce SCC.
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