Rutting behavior and rheological modeling of EVA-modified binders in the mixture and binder scales

• Published in: Materials and structures 2019-04, Vol.52 (2), Article 36
• Main Authors: Domingos, Matheus David Inocente, Faxina, Adalberto Leandro, Bernucci, Liedi Légi Bariani
• Format: Article
• Language: English
• Subjects: Building construction; Building Materials; Civil Engineering; Copolymers; Creep (materials); Engineering; Ethylene vinyl acetates; Machines; Manufacturing; Materials Science; Mathematical models; Original Article; Parameter modification; Processes; Rheological properties; Rheology; Solid Mechanics; Stiffness; Theoretical and Applied Mechanics
• ISSN: 1359-5997; 1871-6873
• DOI: 10.1617/s11527-019-1335-z

This study addressed the rutting potential of binders prepared with ethylene vinyl acetate copolymer (AC + EVA) and this same copolymer combined with polyphosphoric acid (AC + EVA + PPA). Multiple stress creep and recovery (MSCR) tests at 64, 70 and 76 °C were conducted in the binder samples, as well as flow number tests at 60 °C in the mixture samples. The AC + EVA and the AC + EVA + PPA are equally graded on Superpave (76-xx), and rheological models were selected to further investigate this rutting behavior of the materials. The rankings of the most rut resistant mixtures—AC + EVA + PPA, followed by the AC + EVA and the 50/70 base binder—are exactly the same according to the binder parameters J nr (nonrecoverable compliance from MSCR), G V (viscous component of the creep stiffness from the Burgers model) and α from the modified power model. However, the parameter J nr, diff (percent difference in compliances) showed a diametrically opposite trend in terms of the rutting resistance of binders, and this further suggests its inability to be used as a performance-related parameter in the Superpave specification.