Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Self-compacting concrete with carbon fiber reinforcement for industrial floor slabs
When concrete floor slabs are restrained from imposed deformation as a result of temperature (hydration heat and environmental temperature) and shrinkage, stress arises which may lead to cracks. The application of textile reinforcement made of laminated carbon fibers to restrain the crack width offers numerous advantages. Carbon fibers are resistant to corrosion attacks. If reinforcement cross-sections with a diameter of 3 to 6 mm are applied, stress which is twice as high can be absorbed. Especially in combination with self-compacting concrete (SCC), economical advantages can be yielded. When SCC is applied in such floor slabs, particularly high requirements must be placed in this concrete. Questions concerning the viscosity/yield stress of the SCC are to be primarily dealt with, as in such building elements considerably higher requirements must be fulfilled concerning the flowability of the SCC. In order to yield a moderate development of hydration heat in the floor slabs, a cement content of 270 kg/m3 was used. In order to characterize the fresh concrete properties, the slump flow with and without J-ring, the V-funnel-time and the air content were determined and the L-Box test as well as a sedimentation test were conducted. The examinations show that, despite its relatively low water content, the SCC features a very good flowability. The concrete possesses a low viscosity and levels completely after flowing for a distance of 2 m. This was achieved by a granulometric optimization of the fines. An industrial floor of SCC shall be developed and reinforced by a carbon textile.
Self-compacting concrete with carbon fiber reinforcement for industrial floor slabs
When concrete floor slabs are restrained from imposed deformation as a result of temperature (hydration heat and environmental temperature) and shrinkage, stress arises which may lead to cracks. The application of textile reinforcement made of laminated carbon fibers to restrain the crack width offers numerous advantages. Carbon fibers are resistant to corrosion attacks. If reinforcement cross-sections with a diameter of 3 to 6 mm are applied, stress which is twice as high can be absorbed. Especially in combination with self-compacting concrete (SCC), economical advantages can be yielded. When SCC is applied in such floor slabs, particularly high requirements must be placed in this concrete. Questions concerning the viscosity/yield stress of the SCC are to be primarily dealt with, as in such building elements considerably higher requirements must be fulfilled concerning the flowability of the SCC. In order to yield a moderate development of hydration heat in the floor slabs, a cement content of 270 kg/m3 was used. In order to characterize the fresh concrete properties, the slump flow with and without J-ring, the V-funnel-time and the air content were determined and the L-Box test as well as a sedimentation test were conducted. The examinations show that, despite its relatively low water content, the SCC features a very good flowability. The concrete possesses a low viscosity and levels completely after flowing for a distance of 2 m. This was achieved by a granulometric optimization of the fines. An industrial floor of SCC shall be developed and reinforced by a carbon textile.
Self-compacting concrete with carbon fiber reinforcement for industrial floor slabs
Uebachs, Stephan (Autor:in) / Brameshuber, Wolfgang (Autor:in)
2005
8 Seiten, 7 Bilder, 2 Tabellen, 10 Quellen
Aufsatz (Konferenz)
Englisch
Self-Compacting Concrete with Carbon Fiber Reinforcement for Industrial Floor Slabs
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