Avaliação dos efeitos da radiação ultravioleta sobre propriedades reológicas de ligantes asfálticos modificados com PPA e copolímeros SBS e SBR

Authors

  • Thalita Cristina Brito Nascimento Universidade de São Paulo
  • Adalberto Leandro Faxina Universidade de São Paulo

DOI:

https://doi.org/10.14295/transportes.v25i1.1100

Keywords:

Ultraviolet irradiation, Long-term aging, Modified asphalt binders.

Abstract

The aging process suffered by asphalt binders interferes directly with the mechanical properties of HMA mixes. In order to avoid an excessive hardening of the asphalt binder, the specifications limit certain aging indices or aging param-eters. However, asphalt binder specifications do not take account of the effect of the ultraviolet radiation (UV) on the rheo-logical properties of such materials. The objectives of this work are (i) to quantify the effects of the UV radiation on the rheological properties of a 50/70 pen-grade asphalt binder and five asphalt binders modified with polyphosphoric acid and the SBS and SBR copolymers (binder+PPA, binder+SBS, binder+SBS+PPA, binder+SBR and binder+SBR+PPA) and (ii) to compare the aging levels caused by UV radiation with the aging level in the PAV. The samples aged in the PAV and in the wetherometer were previously aged in the RTFO oven. The use of modifiers increased the resistance to long-term aging of the materials, either in the PAV or in the wetherometer. The binder+SBR+PPA showed the best performance in terms of aging resistance.

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Author Biographies

Thalita Cristina Brito Nascimento, Universidade de São Paulo

Departamento de Engenharia de Transportes

Mestre em Engenharia de Transportes - infraestrutura de Transportes

Adalberto Leandro Faxina, Universidade de São Paulo

Departamento de Engenharia de Transportes

Infraestrutura de transportes - pavimentação - ligantes asfálticos

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Published

2017-03-01

How to Cite

Nascimento, T. C. B., & Faxina, A. L. (2017). Avaliação dos efeitos da radiação ultravioleta sobre propriedades reológicas de ligantes asfálticos modificados com PPA e copolímeros SBS e SBR. Transportes, 25(1), 73–81. https://doi.org/10.14295/transportes.v25i1.1100

Issue

Vol. 25 No. 1 (2017)

Section

Articles

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