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Bond strength of pretensioned strands in SCC
Because of its higher powder content and its viscosity, SCC has a different microstructure compared to conventional concrete, which influences significantly the contact zone between the matrix and prestressing strands. Basically, the modulus of elasticity of SCC is lower compared to NSC, whereas the tensile strength is higher. The effects on the bond behavior of strands in SCC are discussed controversially in current literature. Thus, the regulations for bond strength cannot be adopted directly from conventional concrete. As the microstructure depends on the type of concrete, the bond behavior has to be tested for different SCC-types. A systematic investigation on the bond strength of pretensioned strands was conducted including pull-out and full scale tests on the transfer length to improve the knowledge on the bond behavior of strands in SCC. It is revealed, that the bond behavior depends on the microstructure and, thus, on the composition of SCC. The bond capacity of SCC containing limestone fine aggregate is comparable to conventional concrete while the bond capacity of SCC with a high amount of fly ash is reduced by approximately 20 %.
Bond strength of pretensioned strands in SCC
Because of its higher powder content and its viscosity, SCC has a different microstructure compared to conventional concrete, which influences significantly the contact zone between the matrix and prestressing strands. Basically, the modulus of elasticity of SCC is lower compared to NSC, whereas the tensile strength is higher. The effects on the bond behavior of strands in SCC are discussed controversially in current literature. Thus, the regulations for bond strength cannot be adopted directly from conventional concrete. As the microstructure depends on the type of concrete, the bond behavior has to be tested for different SCC-types. A systematic investigation on the bond strength of pretensioned strands was conducted including pull-out and full scale tests on the transfer length to improve the knowledge on the bond behavior of strands in SCC. It is revealed, that the bond behavior depends on the microstructure and, thus, on the composition of SCC. The bond capacity of SCC containing limestone fine aggregate is comparable to conventional concrete while the bond capacity of SCC with a high amount of fly ash is reduced by approximately 20 %.
Bond strength of pretensioned strands in SCC
Hegger, Josef (author) / Will, Norbert (author) / Bülte, Sebastian (author)
2007
6 Seiten, 7 Bilder, 12 Quellen
Conference paper
English
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