Simulação computacional do ensaio de módulo complexo em misturas asfálticas

Abstract

Considering heterogenei"es and using the Finite Element Method, along with the The-ory of Linear Viscoelas"city, the complex modulus test (absolute value called dynamic modulus and a phase angle) in asphalt mixtures is computa"onally simulated. The test consists in applica"on of sinusoidal solicita"on (stress or strain) and the respec"ve read-ing of the mechanical response (strain or stress). Studied materials are a Fine Aggregate Matrix (FAM) and a Hot Mix Asphalt (HMA) composed of coarse aggregates, air and FAM. Mixture design parameters and mechanical proper"es of the cons"tuents are the input parameters. Simula"on results are compared with those obtained from laboratory tests. The influence of the aggregate modulus and voids ra"o on the s"ffness of the mixture is inves"gated. The results showed that at low frequencies, the varia"on in the s"ffness of the aggregate has liIle effect in the varia"on of the dynamic modulus of the mixture, becoming more significant at higher frequencies. In addi"on, it was possible to obtain the dynamic module of the HMA from the simula"on, es"ma"ng the modulus of elas-"city of the aggregates. The dynamic modulus of the mixture decreases with the in-crease in its voids and presents an approximately linear behavior, especially at lower frequencies.