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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Self compactibility of hybrid fiber concrete containing pva fibers
Hybrid fiber concrete (HFC) containing a large concentration of short fibers of several lengths with the aim of increasing the strength and ductility of concrete has been developed. There have been many investigations about the process of the formation of multiple cracking by way of micromechanics based on fracture mechanics and proposed a performance index applicable to mechanical design of cementitious composite materials but these studies only deal with mechanical properties of hardened concrete without assessing the properties while fresh, which is essential for producing HFC. It is empirically known that fluidity is relatively easily obtained with steel fibers. Though, little is known about the fresh properties of mixtures containing organic fibers. In this study, self-compactibility while fresh properties of hybrid fiber concrete (HFC) containing PVA fibers were investigated using combinations of fibers with different lengths and diameters. According to the results: Short fibers affect the viscosity of the matrix. The viscosity of the matrix increases as the short fiber content increases. A large addition of long fibers in a matrix with a low viscosity causes fiber segregation, but this problem can be solved by adding a certain amount of short fibers to increase the viscosity ofthe matrix. A method of assessing the fresh properties of HFC using a slump flow diagram was proposed. By the use of this diagram, the fresh properties of HFC can be qualitatively assessed based on the excess matrix film thickness (tm) and segregation factor (sgf) using the long and short fiber contents as the parameters.
Self compactibility of hybrid fiber concrete containing pva fibers
Hybrid fiber concrete (HFC) containing a large concentration of short fibers of several lengths with the aim of increasing the strength and ductility of concrete has been developed. There have been many investigations about the process of the formation of multiple cracking by way of micromechanics based on fracture mechanics and proposed a performance index applicable to mechanical design of cementitious composite materials but these studies only deal with mechanical properties of hardened concrete without assessing the properties while fresh, which is essential for producing HFC. It is empirically known that fluidity is relatively easily obtained with steel fibers. Though, little is known about the fresh properties of mixtures containing organic fibers. In this study, self-compactibility while fresh properties of hybrid fiber concrete (HFC) containing PVA fibers were investigated using combinations of fibers with different lengths and diameters. According to the results: Short fibers affect the viscosity of the matrix. The viscosity of the matrix increases as the short fiber content increases. A large addition of long fibers in a matrix with a low viscosity causes fiber segregation, but this problem can be solved by adding a certain amount of short fibers to increase the viscosity ofthe matrix. A method of assessing the fresh properties of HFC using a slump flow diagram was proposed. By the use of this diagram, the fresh properties of HFC can be qualitatively assessed based on the excess matrix film thickness (tm) and segregation factor (sgf) using the long and short fiber contents as the parameters.
Self compactibility of hybrid fiber concrete containing pva fibers
Nakamura, Shigeharu (Autor:in) / Mier, Jan G.M. van (Autor:in) / Masuda, Yoshihiro (Autor:in)
2004
11 Seiten, 6 Bilder, 1 Tabelle, 2 Quellen
Aufsatz (Konferenz)
Englisch
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