Efeito da consideração do comportamento viscoelástico linear do revestimento no cálculo de tensões e deslocamentos em pavimentos asfálticos

Abstract

In Brazil, the asphaltic layer is commonly considered linear elastic in pavement stress and displacement analyses. Such approximation precludes a simulation of fatigue cracking and permanent deformation given that it does not consider the asphaltic material dependence on time and load (or displacement) rate application. The consideration of the viscoelastic behavior of the asphaltic layer, however, provides a better understanding of several phenomena observed in asphalt mixtures such as fatigue cracking, rutting and fracture healing. The present paper is concerned with the isothermal stresses and displacements calculations in asphalt pavements considering the viscoelastic behavior of the surface layer. The load rate is analyzed using four different semi-sine loading pulse durations and one step loading duration. Furthermore, considerations are made on the resilient modulus of asphaltic mixtures, which is commonly considered to be an elastic parameter.