ISSN: 1546-962X
Published Online: 17 November 2009
Page Count: 7

Predicting Dynamic Segregation of Self-Consolidating Concrete from the Slump-Flow Test

Tregger, Nathan
Dept. of Civil and Environmental Engineering, Northwestern Univ.,IL,

Ferrara, Liberato
Dept. of Structural Engineering, Politecnico di Milano,

Shah, Surendra
Dept. of Civil and Environmental Engineering, Northwestern Univ.,IL,

(Received 22 June 2008; accepted 22 September 2009)

Abstract

Two key characteristics of self-consolidating concrete are flowability and segregation resistance. Quality control of flowability is typically predicted by the final diameter of the slump-flow test. In this paper, experimental results demonstrate that dynamic segregation of a self-consolidating concrete mix can also be predicted from the slump-flow test by measuring the time it takes for the flow to reach its final diameter. For a constant final diameter and aggregate content, increasing the time to final diameter led to a more stable mix. Two sets of slump-flow and segregation data were obtained for flow diameters of 65 and 70 cm, both with constant water-to-binder and aggregate-to-binder ratios. Dynamic segregation was determined by comparing the aggregate content in three regions: Within the diameter of the slump cone, between the diameter of the cone and a diameter of 50 cm, and between a diameter of 50 cm and the final diameter. In addition, the rapid penetration test was used to compare dynamic and static segregation characteristics.

Keywords:
SCC, segregation, slump-flow test, T50, viscosity, yield stress

Paper ID: JAI101970
DOI: 10.1520/JAI101970
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