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Rheology of self-compacting concrete and recent developments
Self Compacting Concrete (SCC) is characterized by a high volume of cement paste and very fine components, as well as a reduced content and size of coarse aggregate. As a first approximation the flow properties of SCC can be described by using the Bingham model. Rotational viscometers/rheometers make it possible to calculate the two parameters of the equation, that is, yield shear stress and plastic viscosity of the concrete. Pumping is a common technique to set concrete going. Unfortunately, up to this time optimization of the mix-design and the choice of pump need trials on a real scale to assure the pumpability of the conglomerate and to calculate the pressure necessary to have the required flow. A new calculation procedure, taking concrete-pipe interface parameters into consideration, is proposed to predict pumping parameters of concretes of medium-high consistency. Fundamental rheological data of the concrete are measured with the BTRHEOM rheometer and tribological data of the interface with the coaxial cylinders tribometer. The results of the model have been validated for a wide range of concrete, including SCC, by trials on a pilot pumping circuit. A good agreement was found between theoretical assumptions and field measurements.
Rheology of self-compacting concrete and recent developments
Self Compacting Concrete (SCC) is characterized by a high volume of cement paste and very fine components, as well as a reduced content and size of coarse aggregate. As a first approximation the flow properties of SCC can be described by using the Bingham model. Rotational viscometers/rheometers make it possible to calculate the two parameters of the equation, that is, yield shear stress and plastic viscosity of the concrete. Pumping is a common technique to set concrete going. Unfortunately, up to this time optimization of the mix-design and the choice of pump need trials on a real scale to assure the pumpability of the conglomerate and to calculate the pressure necessary to have the required flow. A new calculation procedure, taking concrete-pipe interface parameters into consideration, is proposed to predict pumping parameters of concretes of medium-high consistency. Fundamental rheological data of the concrete are measured with the BTRHEOM rheometer and tribological data of the interface with the coaxial cylinders tribometer. The results of the model have been validated for a wide range of concrete, including SCC, by trials on a pilot pumping circuit. A good agreement was found between theoretical assumptions and field measurements.
Rheology of self-compacting concrete and recent developments
Rheologie von selbstverdichtendem Beton und neuere Entwicklungen
Goisis, M. (author) / Kaplan, D. (author) / Marco, T. de (author) / Marchese, G. (author) / Larrard, F. de (author) / Setran, T. (author)
2001
9 Seiten, 10 Bilder, 16 Quellen
Conference paper
Storage medium
English
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