Ensaios MSCR segundo as normas ASTM D7405-10a e AASHTO T350-14: um estudo de caso envolvendo ligantes asfálticos modificados

Authors

  • Matheus David Inocente Domingos Escola de Engenharia de São Carlos da Universidade de São Paulo (EESC-USP) http://orcid.org/0000-0002-2514-9915
  • Adalberto Leandro Faxina Escola de Engenharia de São Carlos da Universidade de São Paulo (EESC-USP)

DOI:

https://doi.org/10.14295/transportes.v24i3.1115

Keywords:

Crumb Rubber, Polyphosphoric Acid, MSCR test, Performance Grade, ASTM/AASHTO standards.

Abstract

This paper mainly aims at comparing the results of the multiple stress creep and recovery (MSCR) tests according to the ASTM D7405-10a with the ones collected in accordance with the AASHTO T350-14 protocol. These comparisons were made based on tests with asphalt binders modified with polyphosphoric acid, crumb rubber and a combination of both additives. The percent recoveries (R) and the nonrecoverable compliances (Jnr) were calculated and their variations were statistically evaluated. The ASTM procedure underestimated the R values and overestimated the Jnr values for all the formulations,
especially the AC+rubber and the AC+rubber+PPA. The AC+PPA showed low stress sensitivity and the best results for the parameters R and Jnr at 3,200 Pa either in the ASTM or the AASHTO protocols, which justifies its choice as the best formulation. The data from the modified asphalt binders suggest that the change from the ASTM protocol to the AASHTO one is recommended.

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Author Biographies

Matheus David Inocente Domingos, Escola de Engenharia de São Carlos da Universidade de São Paulo (EESC-USP)

Engenharia de Transportes, Infraestrutura de TransportesDepartamento de Engenharia de Transportes (STT)

Adalberto Leandro Faxina, Escola de Engenharia de São Carlos da Universidade de São Paulo (EESC-USP)

Engenharia de Transportes, Infraestrutura de TransportesDepartamento de Engenharia de Transportes (STT)

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Published

2016-12-01

How to Cite

Inocente Domingos, M. D., & Faxina, A. L. (2016). Ensaios MSCR segundo as normas ASTM D7405-10a e AASHTO T350-14: um estudo de caso envolvendo ligantes asfálticos modificados. TRANSPORTES, 24(3), 38–47. https://doi.org/10.14295/transportes.v24i3.1115

Issue

Vol. 24 No. 3 (2016): Prêmio ANPET de Produção Científica 2015

Section

Artigos Vencedores do Prêmio ANPET Produção Científica

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