High-temperature rheological properties of PPA-modified asphalt binders of different sources

Authors

  • Thaís Ferreira Pamplona Universidade de São Paulo
  • Fernanda Pilati Sobreiro Universidade de São Paulo
  • Adalberto Leandro Faxina Universidade de São Paulo
  • Glauco Tulio Pessa Fabbri Universidade de São Paulo

DOI:

https://doi.org/10.4237/transportes.v20i4.612

Abstract

The polyphosphoric acid (PPA) has been used as an additive in asphalt binders in order to stiffen them and also improve the high-temperature rheological properties without affecting the low-temperature properties. The hardening induced by addition of PPA is beneficial to the rutting resistance, however, it can be detrimental to the fatigue and thermal cracking resistances, since the asphalt becomes brittle with the increasing of stiffness. To evaluate the effect of PPA addition in asphalt binders from different sources, three base 50/70 penetration-grade asphalt binders with distinct chemical composition and different performance grade (REDUC, LUBNOR and REPLAN) were modified with five PPA proportions (0.0, 0.5, 1.0, 1.5 and 2.0%). The specimens were submitted to the PG (penetration grade) and Multiple Stress Creep and Recovery tests. The results indicated that the asphalt binders respond differently to the PPA addition depending on their chemical composition, and the asphalt binder from LUBNOR provides higher gains with the lowest consumption of PPA and the REDUC is the one which requires higher PPA proportions.

Keywords: polyphosphoric acid, performance grade, MSCR test, percent recovery, non-recoverable compliance, rheological test

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Published

2012-12-27

How to Cite

Pamplona, T. F., Sobreiro, F. P., Faxina, A. L., & Pessa Fabbri, G. T. (2012). High-temperature rheological properties of PPA-modified asphalt binders of different sources. TRANSPORTES, 20(4), 5–11. https://doi.org/10.4237/transportes.v20i4.612

Issue

Vol. 20 No. 4 (2012): Ligantes e Misturas Asfálticas

Section

Artigos

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