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Benefits of SCC
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A major thrust area for research of SCC is in the understanding formwork pressure. Provisions of the current ACI Manual of Concrete Practice (i.e. ACI 347R) do not specifically address SCC, but recommend that unless a method based on appropriate experimental data is available, formwork should be designed to withstand the full hydrostatic head of fluid concrete. This guidance generally limits contractors to short walls or extremely strong formwork. Thus, there is great need for better understanding of the pressures that are actually seen in cast-in-place applications in the field. Further study is necessary so that equations can be developed to reliably predict formwork pressures for a range of casting rates, and to calculate allowable casting rates based on formwork strength. As in the case of conventional concrete, there are many factors governing the pressure exerted by SCC, including: the stiffening behavior of undisturbed SCC, the casting rate, the height of the formwork, temperature, vibration, and susceptibility to disturbance of the concrete. An additional difficulty is that there are no standard methods for studying formwork pressure in the field or in the laboratory.
Lead Authors: B. Birch and D. Lange, University of Illinois
Contributing Author: K. Khayat, University of Sherbrooke
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