Aplicação da dinâmica molecular em novos materiais para pavimentação

Abstract

The search for new materials is of vital importance to the civil construction industry in the state of Amazonas, due the lacking of aggregate material in this region. In this work we studied the mechanical properties of two new materials to be used as aggregates in pavement construction: the ASAC (sintered calcinated clay aggregates) and Açaí seed, with the perspective of sustainable use of our natural resources of raw. We performed two kind of experiment to obtain the mechanical properties of these materials: the laboratory real experiment and its simulation by Molecular Dynamics (MD). In laboratory we characterized physically both materials. From the unconfined compression test of the grains of each material, we obtained their Young Modulus, and from the confined compression test of a cylindrical sample of each material we obtained the spectrum of tension strength as a function of the deformation. In the Molecular Dynamics simulation we used a constitutive viscoelastic model to represent the interactions between the grains of the studied materials, which depend on their Young Modulus. We conducted the theoretical experiment (MD) of the confined compression test to obtain the tension strength as a function of the deformation. From the fitting of the results of the theoretical experiment to the real experiment results we obtained the Young Modulus for both materials, which are in good agreement with the results obtained from the unconfined compression test for the grains of ASAC and seeds of Açaí.