Previsão do módulo dinâmico de misturas asfálticas brasileiras
DOI:
https://doi.org/10.14295/transportes.v26i4.1388Keywords:
Misturas asfálticas, Módulo dinâmico, Modelos de previsão.Abstract
O módulo dinâmico |E*| é a propriedade de rigidez de misturas asfálticas mais utilizada como parâmetro de entrada no dimensionamento mecanístico-empírico de estruturas de pavimentos asfálticos. Apesar de bem estabelecido internacionalmente, ainda não há, no Brasil, normatização de ensaio para sua determinação, e ele não é considerado no método vigente de dimensionamento. Embora as metodologias de ensaio sejam bem consolidadas internacionalmente, diversos modelos de previsão de |E*| são reportados na literatura internacional, objetivando reduzir tempo e custos de sua obtenção experimental. No presente estudo, foram avaliados modelos de previsão de módulo dinâmico da literatura internacional, com dados de ensaios laboratoriais de 24 misturas asfálticas nacionais. Avaliados os modelos existentes, foi proposta a calibração daquele que se mostrou mais eficiente, resultando em uma equação simplificada e bem ajustada aos dados analisados. Espera-se que modelos calibrados como o aqui proposto possam ser facilitadores da aplicação, no Brasil, de métodos mecanístico-empíricos de dimensionamento de pavimentos. Esses métodos possibilitam considerar o comportamento viscoelástico dos materiais asfálticos, ou seja, levar em conta os efeitos da temperatura e da velocidade dos veículos no projeto de pavimentos.Downloads
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