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Influência da formulação de esqueletos minerais na deformação permanente de misturas de concreto asfáltico densas

  • Andrade, Viviane Dias
Publication Date
Sep 22, 2018
Repositório Institucional da UFSC
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Abstract : The main aim of this research is to evaluate the influence of mineral skeletons formulation on rutting resistance of dense asphalt mixes from two distinct methods: trial and theoretical. Method by trial is majorly adopted in Brazil to formulate asphalt mixes, using heterogeneous commercial granular fractions without an accurate control regarding individual distribution of the particles, aiming at to try to fit a given formulation into gradation bands standardized by the Departamento Nacional de Infraestrutura de Transportes (DNIT). Otherwise, theoretical method is based on rational calculus from Equations, as that of Füller-Talbot, comprising a controlled individual fractioning of the particle diameters, fixing the maximum diameter and the percent passing through the smallest sieve opening concerning the series chosen. Thus, it is possible to establish a granulometric formulation able to gradually fill in the voids generated by the particles with bigger dimensions. They are compared three asphalt mix formulations, using the same asphalt binder 50/70 pen in pure form, but varying the granulometric matrix formulation, being all of them provided by granitic crushed rock, such as: formulation by trial, named practical curve (CP), formulation by trial with a direct graphical adjustment of the granular percents (CPadjusted) and theoretical curve (CT). Due to being the official asphalt mix dosage procedure adopted in Brasil by DNIT, Marshall methodology was chosen to initially indicate the asphalt binder optimum content of the formulations, together with indirect tensile test. However, more accurate field/laboratory tests, based on the French formulation methodology, evaluated the compacting workability by the use of Giratory Compacting Shear Press and the resistance to rutting. They were also evaluated the roughness level and surface drainability of the asphalt mixes formulated. The results obtained indicate that the theoretical method is more efficient to formulate mineral skeletons when compared to the methods by trial, due to guarantee better particle interlocking, less asphalt binder consuming in dosage and higher asphalt mix rutting resistance.

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