Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Self-consolidating concrete affected by creep
This paper outlines an extensive number of laboratory tests on long-term deformations of Self-Consolidating Concrete. For this purpose Self-Consolidating Concrete and vibrated concrete were fabricated. The water-cement ratio of the concrete varied between 0.27 and 0.80 and had strength at the most between 14 and 171 MPa. Studies on shrinkage, strength and relative humidity were performed in parallel. The effect of a late start of drying on creep was also incorporated in the studies. The results show creep and shrinkage of Self-Consolidating Concrete of the same range of order as for vibrated concrete at constant strength. No significant difference between the elastic modulus of Self-Consolidating Concrete and that of vibrated concrete was observed at a constant strength. However, at a constant water-cement ratio a higher strength was observed in Self-Consolidating Concrete than in vibrated concrete, which in turn lead to lower creep and shrinkage and a higher elastic modulus in Self-Consolidating Concrete than in vibrated concrete. Present models for calculation of creep and shrinkage do not take into account the effect of self-desiccation (autogenous shrinkage). The creep coefficient developed similarly in Self-Consolidating Concrete as in a vibrated one. The work was performed at Lund Institute of Technology.
Self-consolidating concrete affected by creep
This paper outlines an extensive number of laboratory tests on long-term deformations of Self-Consolidating Concrete. For this purpose Self-Consolidating Concrete and vibrated concrete were fabricated. The water-cement ratio of the concrete varied between 0.27 and 0.80 and had strength at the most between 14 and 171 MPa. Studies on shrinkage, strength and relative humidity were performed in parallel. The effect of a late start of drying on creep was also incorporated in the studies. The results show creep and shrinkage of Self-Consolidating Concrete of the same range of order as for vibrated concrete at constant strength. No significant difference between the elastic modulus of Self-Consolidating Concrete and that of vibrated concrete was observed at a constant strength. However, at a constant water-cement ratio a higher strength was observed in Self-Consolidating Concrete than in vibrated concrete, which in turn lead to lower creep and shrinkage and a higher elastic modulus in Self-Consolidating Concrete than in vibrated concrete. Present models for calculation of creep and shrinkage do not take into account the effect of self-desiccation (autogenous shrinkage). The creep coefficient developed similarly in Self-Consolidating Concrete as in a vibrated one. The work was performed at Lund Institute of Technology.
Self-consolidating concrete affected by creep
Persson, Bertil (Autor:in)
2005
7 Seiten, 10 Bilder, 15 Quellen
Aufsatz (Konferenz)
Englisch
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