Static Stability of Self-Consolidating Concrete

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Title: Static Stability of Self-Consolidating Concrete

Author(s): J. A. Daczko

Publication: Special Publication

Volume: 222

Issue:

Appears on pages(s): 51-62

Keywords: aggregates; bleeding; gradations; self-consolidating concrete; slump flow; stability; test methods

Date: 5/1/2004

Abstract:
Self-Consolidating Concrete (SCC) is recognized by those in the industry as a mixture that can flow into place and completely fill formwork with little or no vibration. This concept immediately brings to mind an image of a highly fluid concrete mixture that flows like water. It is the level of fluidity that provides the self-consolidation and ease of placement characteristics that both precast concrete producers and concrete con-tractors are anticipating when they use SCC. The characteristic of fresh concrete stability, however, is also important although it may sometimes be overlooked. Stability is critical both during the placement operations (dynamic stability) as well as once placement is complete (static stability). Because the stability of the SCC mixture has significant impact on the final hardened properties of the concrete, it should be considered during the mixture development and quality control process. This paper outlines some of the variables that influence SCC static stability and provides insight on how to control them.