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Inhomogeneous interfacial transition zone model for the elastic moduli of concrete
An inhomogeneous interfacial transition zone model has been developed for the macroscopic elastic moduli of concrete. Each inclusion (fine or coarse aggregate) is assumed to be spherical, and surrounded by an interfacial transition zone (ITZ) in which the elastic moduli vary smoothly as a function of radial distance from the center of the inclusion, according to a power law. The exponent in the power law can be chosen based on the estimated thickness of the ITZ, or by fitting the power law to measured porosity profiles: For this model, an analytical expression has been found for the overall effective bulk modulus. The macroscopic bulk modulus of the concrete depends on known properties such as the elastic moduli of the bulk cement paste and the inclusions, the volume fraction of the inclusions, as well as on the elastic moduli at the interface. By comparing the model predictions to measurements of the macroscopic elastic moduli, estimates can be obtained of the elastic moduli at the interface. This model affords a simple, non-destructive method for estimating the mechanical properties within the interfacial transition zone.
Inhomogeneous interfacial transition zone model for the elastic moduli of concrete
An inhomogeneous interfacial transition zone model has been developed for the macroscopic elastic moduli of concrete. Each inclusion (fine or coarse aggregate) is assumed to be spherical, and surrounded by an interfacial transition zone (ITZ) in which the elastic moduli vary smoothly as a function of radial distance from the center of the inclusion, according to a power law. The exponent in the power law can be chosen based on the estimated thickness of the ITZ, or by fitting the power law to measured porosity profiles: For this model, an analytical expression has been found for the overall effective bulk modulus. The macroscopic bulk modulus of the concrete depends on known properties such as the elastic moduli of the bulk cement paste and the inclusions, the volume fraction of the inclusions, as well as on the elastic moduli at the interface. By comparing the model predictions to measurements of the macroscopic elastic moduli, estimates can be obtained of the elastic moduli at the interface. This model affords a simple, non-destructive method for estimating the mechanical properties within the interfacial transition zone.
Inhomogeneous interfacial transition zone model for the elastic moduli of concrete
Lutz, M.P. (author) / Monteiro, P.J.M. (author) / Zimmerman, R.W. (author)
Materials for the New Millennium, Materials Engineering Conf, 4 ; 2 ; 1246-1255
1996
10 Seiten, 4 Bilder, 2 Tabellen, 16 Quellen
Conference paper
English
Inhomogeneous Interfacial Transition Zone Model for the Elastic Moduli of Concrete
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