Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Time-dependent properties of high-performance concrete
The modulus of elasticity of high-performance concrete (HPC) depends highly on the type of the coarse aggregates, rather than the compressive strength. Drying before loading can significantly reduce the modulus of elasticity. Basic shrinkage of HPC is high and it develops fast after set. The total value is in the range of 400 x l0-6 for HPC containing silica fume. The total shrinkage of HPC is similar to that of normal concrete. Both basic creep and particularly drying creep are smaller than those of normal concrete. Creep of HPC loaded at early ages develops very fast and stabilizes after a few weeks. The CEB-FIP code generally underestimates shrinkage of HPC by about 50 %. Both ACI and CEB-HP tend to overestimate particularly long-term creep of HPC, but underestimate the creep development rate immediately after loading at early ages. The newly proposed prediction model by the authors overcomes most of the problems in the existing models, and seems to estimate creep and shrinkage of HPC with reasonable accuracy,although work is still needed to further verify the model against a more extensive data base.
Time-dependent properties of high-performance concrete
The modulus of elasticity of high-performance concrete (HPC) depends highly on the type of the coarse aggregates, rather than the compressive strength. Drying before loading can significantly reduce the modulus of elasticity. Basic shrinkage of HPC is high and it develops fast after set. The total value is in the range of 400 x l0-6 for HPC containing silica fume. The total shrinkage of HPC is similar to that of normal concrete. Both basic creep and particularly drying creep are smaller than those of normal concrete. Creep of HPC loaded at early ages develops very fast and stabilizes after a few weeks. The CEB-FIP code generally underestimates shrinkage of HPC by about 50 %. Both ACI and CEB-HP tend to overestimate particularly long-term creep of HPC, but underestimate the creep development rate immediately after loading at early ages. The newly proposed prediction model by the authors overcomes most of the problems in the existing models, and seems to estimate creep and shrinkage of HPC with reasonable accuracy,although work is still needed to further verify the model against a more extensive data base.
Time-dependent properties of high-performance concrete
Dilger, W.H. (Autor:in) / Wang, C. (Autor:in)
1998
5 Seiten, 8 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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