Formwork Pressure of Self-Consolidating Concrete in Tall Wall Field Applications (05-1517)**
Fernando Tejeda-Dominguez, University of Illinois, Urbana-Champaign
David A. Lange, University of Illinois, Urbana-Champaign
Matthew D. D'Ambrosia, University of Illinois, Urbana-Champaign

The growing interest in the use of self-consolidating concrete (SCC) for a wide variety of structural applications has initiated a reexamination of its properties and current construction practices, and how they compare to conventional concrete. One property of interest is the formwork pressure of SCC and how it relates to conventional concrete. This work presents the results from three tall walls (28, 21.7 and 13 ft. tall) cast slowly with SCC, and a 10.6 ft. high column poured quickly using the same concrete as one of the walls. The research demonstrates that pressure of SCC against formwork drops very quickly just after the concrete material is placed. Measurements from the walls poured slowly show that the maximum recorded pressure falls far below the hydrostatic pressure and is closely related to the pouring rate. The experiments also reveal that formwork pressure exerted by SCC can be revitalized if vibrated, even if stiffening is already in progress