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Shear strength of concrete beams made of self-consolidating concrete
Using self-consolidating concrete (SCC) offers ecological and economic advantages, especially for the precast concrete industry. For an efficient application, besides appropriate concrete formulations and manufacturing procedures, the mechanical characteristics of the concrete and their effects on the structural behavior are of particular interest. So far, numerous material models for the fresh and hardened concrete are available. However, experimental tests are missing in order to extrapolate the material models to design rules for real structural members. The main characteristics of SCC are homogeneously distributed pores and less porous interfacial zone between aggregates and concrete matrix. Due to the changed ratios between tensile and compressive strength as well as the reduced crack-friction capacity resulting from the smaller aggregates, the applicability of the common design models for shear to structural members made of SCC has to be verified. Therefore, shear tests have been performed at the Institute of Structural Concrete at RWTH Aachen University. The test program included reinforced and prestressed concrete beams with and without shear reinforcement to investigate the complete shear stress range. Without shear reinforcement the shear carrying capacity of beams made of SCC does not differ from those made of conventional concrete. Shear stresses may be transferred across the cracks at low levels; at failure, the cracks are opened to an extent at which no significant shear stresses are transferred across the crack. For beams made of SCC with low and medium shear reinforcement ratio the shear carrying behavior is similar to those of normal vibrated concrete. The shear carrying capacity of SCC beams with high shear reinforcement ratios is slightly lower than the shear carrying capacity of beams made of conventional concrete.
Shear strength of concrete beams made of self-consolidating concrete
Using self-consolidating concrete (SCC) offers ecological and economic advantages, especially for the precast concrete industry. For an efficient application, besides appropriate concrete formulations and manufacturing procedures, the mechanical characteristics of the concrete and their effects on the structural behavior are of particular interest. So far, numerous material models for the fresh and hardened concrete are available. However, experimental tests are missing in order to extrapolate the material models to design rules for real structural members. The main characteristics of SCC are homogeneously distributed pores and less porous interfacial zone between aggregates and concrete matrix. Due to the changed ratios between tensile and compressive strength as well as the reduced crack-friction capacity resulting from the smaller aggregates, the applicability of the common design models for shear to structural members made of SCC has to be verified. Therefore, shear tests have been performed at the Institute of Structural Concrete at RWTH Aachen University. The test program included reinforced and prestressed concrete beams with and without shear reinforcement to investigate the complete shear stress range. Without shear reinforcement the shear carrying capacity of beams made of SCC does not differ from those made of conventional concrete. Shear stresses may be transferred across the cracks at low levels; at failure, the cracks are opened to an extent at which no significant shear stresses are transferred across the crack. For beams made of SCC with low and medium shear reinforcement ratio the shear carrying behavior is similar to those of normal vibrated concrete. The shear carrying capacity of SCC beams with high shear reinforcement ratios is slightly lower than the shear carrying capacity of beams made of conventional concrete.
Shear strength of concrete beams made of self-consolidating concrete
Hegger, Josef (author) / Rauscher, Sabine (author) / Kommer, Boris (author) / Görtz, Stephan (author)
2005
7 Seiten, 5 Bilder, 1 Tabelle, 10 Quellen
Conference paper
English
Shear Strength of Concrete Beams Made of Self-Consolidating Concrete
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