INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
capítulos de libros
Título:
Numerical analysis of Recycled Aggregate Concrete mechanical behavior
Autor/es:
FOLINO, P
Libro:
Computational Modelling of Concrete Structures
Editorial:
CRC Press
Referencias:
Lugar: London; Año: 2014; p. 263 - 272
Resumen:
This paper deals with the constitutive modeling of Recycled Aggregate Concrete (RAC) in which natural coarse aggregates are partially or totally replaced by recycled concrete aggregates obtained from crushed hardened concrete. These aggregates, presenting greater porosity than natural ones, cause the degradation in elastic and strength properties of concrete when compared with standard concrete.The proposed constitutive model for RAC constitutes an extension of the Performance Dependent Model (PDM) by Folino and Etse (2012) which is based on the flow theory of plasticity. It depends on the three stress invariants, and includes a non associative flow rule, an anisotropic hardening law, and a fracture-energy based softening law. A key aspect of the PDM is the consideration of the so-called performed parameter, based on fundamental concrete properties, which plays a relevant roll in the strength and ductility features of concrete behavior. This feature turns the PDM particularly suitable to model failure behavior of RAC by performing the appropriated reformulations.After describing the PDM´s main features, an analysis of RAC´s response behavior and failure mechanism is performed, from which some fundamental material parameters are identified. Then, a reformulation of the PDM is presented to model mechanical behavior of RACs. Some comparisons between experimental results and numerical predictions with the proposed model of uniaxial and triaxial compression tests on RAC are presented to show the capabilities of the constitutive formulation in this work. Finally, some numerical tests are performed with the aim of exploring both, RAC´s failure behavior under mixed-mode of fracture, and the differences with that of standard concrete.