United States Department of Transportation
i
Influence of mixing procedure on robustness of self-consolidating concrete.
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2014-08-01
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Abstract:Self-Consolidating Concrete is, in the fresh state, more sensitive to small variations in the constituent elements and the mixing
procedure compared to Conventional Vibrated Concrete. Several studies have been performed recently to identify robustness of SCC
and to develop solutions to increase the robustness of SCC. Ghent University obtained a major research project from the Research
Foundation in Flanders (FWO) to investigate fundamentally robustness of SCC and to identify potential solutions in the form of
alternative materials to enhance robustness.
In the present research project, Missouri S&T extended the research at Ghent University by investigating the influence of the mixing
procedure on the robustness of SCC. The project was split into four tasks. In a first task, the sequence of adding the constituent
elements and mixing was investigated by measuring the rheological properties of cement pastes. In a second task, the combined
influence of the most significant mix design and mixing procedure parameters were investigated, with particular attention to the mix
design parameters which influence the robustness of the cement paste to a change in time of addition of the superplasticizer. In the
third task, the results obtained on cement pastes were validated on concrete scale, with focus on the adding sequence of the aggregates
and their initial moisture content. In the fourth task, the robustness of thixotropy and loss of workability was investigated on cement
paste and concrete scale.
To enhance the application of SCC for the construction and repair of transportation infrastructure, two key concepts are of importance:
quality control and consistency. The consistency refers to the mixing operations and transportation of SCC. It is recommended to keep
the mixing procedure constant for every SCC produced. This includes the addition sequence of the materials, the mixing time, the
mixing speed and the concrete volume (parameter not tested, but it is reflected in mixing energy). The quality control is not only
necessary to determine the moisture content of the aggregates, but also for any of the other constituent elements used.
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