Influencia de la calidad del agregado en la determinación del módulo elástico del hormigón

Abstract

The elastic modulus (Ec) is one of the most important properties of concrete since it largely influences the behavior of structural and non structural elements in the line regime. Ec also plays an important role in calculating instantaneous and long-term deflections of reinforced concrete elements. On the other hand, the Ec combined with the section properties influences the stiffness and story drifts during the analysis of concrete structures. International codes such as the American Concrete Code ACI318-19, or the model code MC 2010, include several expressions that allow Ec to be determined based on different parameters, the main one being the compressive strength of the concrete (f'c). However, sometimes it is insufficient to determine the Ec based on a single variable. On the other hand, the Ecuadorian Construction Standard 2015 NEC-SE-HM, includes more refined formulations to determine the Ec, which is based on the modulus of elasticity of the aggregates (Ea), a parameter that in practice is complicated measure it. Within this context, the present investigation tries to determine the relationship that the Ec of the concrete has with the quality parameters of the aggregates in order to determine if there is a direct relationship between them. For this, nine types of concrete mixtures have been made using three types of aggregates and three compressive strengths (21MPa, 24MPa and 28 MPa). Once the experimental results have been validated, the results show that there is a strong relationship between two parameters that serve to characterize the quality of coarse aggregates with the modulus of elasticity of the concrete.