Abstract
Bitumen is a hydrocarbon product prone to oxidative aging. For this reason, the aim of this study is to evaluate physical and rheological properties of modified bitumen with pruning residues from blueberry bushes powder (RPA), anti-aging natural compound, to reduce the oxidative damage of bitumen. Rolling thin film oven test (RTFOT) was performed to simulate short term aging of modified bitumen with 2, 6 and 10% RPA by weight. The results of conventional tests (penetration, softening point, ductility and rotational viscosity) indicated that the addition of RPA increases the stiffness of bitumen and decreases its temperature susceptibility. In addition, dynamic shear rheometer test (DSR) shows that modified binders improve their resistance against deformation and enhance their elastic response. The 6% RPA binder demonstrated better oxidative aging resistance without compromising its performance at low temperature.
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