ABSTRACT
To achieve better binder properties, the modification of bitumens with nanoparticles seems very promising, in particular for temperature susceptibility, moisture damage and aging resistance. The expectations come from nano-dimension, which enable different properties from those of the same substance with larger dimensions. Thus, it is expected that a small amount of nanoparticles will lead to a notorious effect on the macroscopic properties of the final binder. In this study, Zero-Valent Iron (ZVI) nanoparticles were used to modify a neat 35/50 penetration class bitumen. The neat and nanomodified binders were tested for penetration, softening point, and dynamic viscosity. The correspondent bituminous mixtures were tested to evaluate stiffness, fatigue resistance, and water sensitivity. The paper discusses the results obtained. The ZVI modified mixture showed considerable improvement in the water sensitivity, suggesting that the modification can have an important effect on the durability of the bituminous mixtures.
