Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Glass concrete thin sheets prestressed with continuous aramid fibers: report on recent progress at Columbia University
In a recent research project at Columbia University the feasibility of prestressing thin glass concrete sheets with fabrics made of aramid rovings was experimentally investigated. This report summarizes the basic experimental procedure, which was followed during the production of 1/4 in (7 mm) thin, 1 in (25.4 mm) wide, and 7 in (180 mm) long prestressed glass concrete beams. Beams were prepared at prestress levels of 0, 0.5, 1.0, 1.5, 2.0 ksi (0 - 14 MPa). It has been observed that a large amount of the prestress is lost during the first few hours of hydration. Once the concrete has hardened, however, the prestress level stabilizes. The mechanical properties of prestressed thin beams were studied by means of regular three-point bending. By prestressing thin beams one can delay the formation of distributed cracking patterns and greatly enhance the stiffness of the section in the cracked state. Cracking strains and load responses were increased by up to 100% and 70%, respectively.
Glass concrete thin sheets prestressed with continuous aramid fibers: report on recent progress at Columbia University
In a recent research project at Columbia University the feasibility of prestressing thin glass concrete sheets with fabrics made of aramid rovings was experimentally investigated. This report summarizes the basic experimental procedure, which was followed during the production of 1/4 in (7 mm) thin, 1 in (25.4 mm) wide, and 7 in (180 mm) long prestressed glass concrete beams. Beams were prepared at prestress levels of 0, 0.5, 1.0, 1.5, 2.0 ksi (0 - 14 MPa). It has been observed that a large amount of the prestress is lost during the first few hours of hydration. Once the concrete has hardened, however, the prestress level stabilizes. The mechanical properties of prestressed thin beams were studied by means of regular three-point bending. By prestressing thin beams one can delay the formation of distributed cracking patterns and greatly enhance the stiffness of the section in the cracked state. Cracking strains and load responses were increased by up to 100% and 70%, respectively.
Glass concrete thin sheets prestressed with continuous aramid fibers: report on recent progress at Columbia University
Vilkner, G. (Autor:in) / Meyer, C. (Autor:in)
2003
12 Seiten, 8 Bilder, 3 Tabellen, 17 Quellen
Aufsatz (Konferenz)
Englisch
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