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High performance self-compacting light-weight aggregate concrete with and without fibre-reinforcement
Various concrete mixes of self-compacting lightweight concrete (SCLC) with unit weights ranlging from 1400 up to 1900 kg/m3 were developed. The unit weight of concrete was adjusted mainly by applying different types and varying amounts of fine and coarse lightweight aggregates. In order to increase the resistance of SCLC against segregation the viscosity and the shear resistance of the binder paste were optimized such that segregation was prevented while maintaining a high workability of the concrete. For this reason, the rheological properties of the binder paste and the mortar were studied systematically by means of a rheometer. This investigation revealed a valuable insight in the basic rheological mechanisms being responsible for the self-compaction process. The performed experiments on hardened concrete showed that at least the compressive strength and the modulus of elasticity of the developed SCLC correspond to a great extent to those of ordinary structural lightweight concretes. Furthermore, in order to increase the ductility of the developed concretes a fibre-reinforcement was applied. It was found that up to some defined percentage of fibres, the workability remains more or less constant. This indicated content of fibres is sufficient to achieve the desired effects on the mechanical properties of SCLC.
High performance self-compacting light-weight aggregate concrete with and without fibre-reinforcement
Various concrete mixes of self-compacting lightweight concrete (SCLC) with unit weights ranlging from 1400 up to 1900 kg/m3 were developed. The unit weight of concrete was adjusted mainly by applying different types and varying amounts of fine and coarse lightweight aggregates. In order to increase the resistance of SCLC against segregation the viscosity and the shear resistance of the binder paste were optimized such that segregation was prevented while maintaining a high workability of the concrete. For this reason, the rheological properties of the binder paste and the mortar were studied systematically by means of a rheometer. This investigation revealed a valuable insight in the basic rheological mechanisms being responsible for the self-compaction process. The performed experiments on hardened concrete showed that at least the compressive strength and the modulus of elasticity of the developed SCLC correspond to a great extent to those of ordinary structural lightweight concretes. Furthermore, in order to increase the ductility of the developed concretes a fibre-reinforcement was applied. It was found that up to some defined percentage of fibres, the workability remains more or less constant. This indicated content of fibres is sufficient to achieve the desired effects on the mechanical properties of SCLC.
High performance self-compacting light-weight aggregate concrete with and without fibre-reinforcement
Selbstverdichtender Hochleistungs-Leicht-Aggregat-Beton mit und ohne Faserverstärkung
Haist, M. (author) / Mechtcherine, V. (author) / Müller, H.S. (author)
2002
12 Seiten, 6 Bilder, 5 Tabellen, 5 Quellen
Conference paper
English
High Performance Self-Compacting Lightweight Aggregate Concrete with and without Fibre-Reinforcement
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