Desenvolvimentos recentes em ensaios de fadiga em ligantes asfálticos

Authors

  • Thaís Ferreira Pamplona Universidade de São Paulo
  • Javier Yesid Mahecha Nuñez Universidade de São Paulo
  • Adalberto Leandro Faxina Universidade de São Paulo

DOI:

https://doi.org/10.14295/transportes.v22i3.682

Keywords:

Linear amplitude sweep (LAS). Time sweep. Fatigue. Modified asphalt binders. Polyphosphoric acid.

Abstract

The resistance to fatigue cracking affects directly the lifespan of asphaltic pavements. In order to improve the fatigue performance of HMA mixes, additives have been incorporated into the asphalt binder. The hardening of the asphalt binder induced by additives, as a rule, increases the rutting resistance, but, on the other hand, it is not clearly known which are their effects on the resistance of asphalt binders to fatigue and thermal cracking. One of the main actual challenges for researchers is the development of a rapid test procedure to determine the fatigue resistance of asphalt binder in the laboratory. In the time line of the development of fatigue tests, Bahia et al. (2001) proposed the time-sweep test. Afterward, Johnson (2010) developed the LAS test (Linear Amplitude Sweep), in which a model that correlates the fatigue life of asphalt binders to the load applied is adjusted. More recently, Hintz (2012) proposed some changes in the LAS test procedure, establishing the modified LAS and a new method to analyze the results. Based on these recent developments, this work aims to introduce the most recent procedures (time sweep, original LAS and modified LAS) to evaluate the fatigue behavior of asphalt binders, exemplifying its applicability in the characterization of modified asphalt binders.

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Author Biographies

Thaís Ferreira Pamplona, Universidade de São Paulo

Departamento de Engenharia de Transportes - infraestrutura de transportes

Javier Yesid Mahecha Nuñez, Universidade de São Paulo

Departamento de Engenharia de Transportes - infraestrutura de transportes

Adalberto Leandro Faxina, Universidade de São Paulo

Departamento de Engenharia de Transportes - infraestrutura de transportes

References

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Published

2014-09-08

How to Cite

Pamplona, T. F., Mahecha Nuñez, J. Y., & Faxina, A. L. (2014). Desenvolvimentos recentes em ensaios de fadiga em ligantes asfálticos. TRANSPORTES, 22(3), 12–25. https://doi.org/10.14295/transportes.v22i3.682

Issue

Vol. 22 No. 3 (2014)

Section

Artigos

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