Self-Consolidating High Performance Concrete – SCC – Self-Compacting & Highly Flowable Concrete

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Robustness of SCC

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Self-consolidating concrete is an emerging technology that utilizes flowable concrete

that eliminates the need for consolidation. Apart from regulation considerations, the growth of the SCC market share depends to a great extent on the robustness of the mixtures.

Robustness depends on a number of different attributes including the mix design, shear energy, shear rate, and application. It implies that a given mixture can be regarded as robust for a lateral flow application, such as garage floor, but might segregate once it cast into tall columns. Similarly, because of thixotropy considerations, a robust mix that is successfully cast into columns might turn out to be a non-robust mix if it has a different mixing history.

From all practical considerations (and in analogy to the flow requirements), it is the opinion of the authors that robustness should be evaluated according to the application. For example, for most lateral flow applications, the VSI method mentioned above is sufficient for rating the robustness of the mix. In more demanding applications, other quantitative methods listed above should be used. Robustness issues can be overcome if a greater attention is paid to the moisture variations in aggregate and carefully metering of all ingredients, especially chemical admixture and water. Higher robustness is achieved by increasing the viscosity of the mixture via materials selection and incorporation of more VMA and/or powder. In regard to the latter, incorporation of supplementary cementitious materials of high specific gravity, such as slag, dolomite, or limestone increases the robustness considerably.

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