Abstract
The main objectives of this work were to investigate the physical and rheological properties of nano zinc oxide (NaZO) flake structure as a modifier in asphalt binder. NaZO was produced with hydrothermal method by using two precursors, which are zinc nitrate and sodium hydroxide. NaZO was mixed with virgin binder 60/70 penetration grade at 3%, 5% and 7% of asphalt binder weight, respectively. The physical properties were evaluated by conventional testing, such as penetration, softening point and viscosity. Meanwhile, the rheological property, such as rutting resistance, was measured by using a dynamic shear rheometer (DSR) for unaged and rolling thin film oven (RTFO) aged. It was observed that the penetration value was decreased and the softening point increased with increasing NaZO concentrations. In addition, the rutting resistance factor was increased for the modified binder. A comparison between the modified binder, 7% NaZO, showed a greater resistance to rutting before and after aging. Results of this study showed that the NaZO addition had increased the asphalt binder stiffness ; thus, could contribute to better resistance to permanent deformation.
Highlights
In recent years, nanotechnology has become a promising and creative technique in material industry and nanomaterials were widely appliedin various fields across the world
This study assessed the different percentages of nano zinc oxide (NaZO) flake particles in PEN 60/70 virgin asphalt binder modification
NaZO modified asphalt (NAZOMA) binder showed an increased rutting resistance, which was expected by an increase in the G*/sin δ parameter at 64°C testing temperature
Summary
Nanotechnology has become a promising and creative technique in material industry and nanomaterials were widely appliedin various fields across the world. There are various nanomaterials which were or have the potential to modifyasphalt, such as nanoclay, nanosilica, nanohydrated lime, nanosized plastic powders (or polymerized powders) nanofibers, nanotubes and nanocharcoal [1]–[3] Another nanomaterial commonly used for asphalt modification is nano zinc oxide (NaZO). NaZO is commonly available as white powder It is used in many industries, such as paints, cosmetics, plastic and rubber manufacturing and electronics, because of its unique and special properties [4]. This nanomaterial has attracted the attention of asphalt pavement researchwith more positive results expectation. It was observed that NaZO can contribute to a homogenous dispersion and decrease the average size of bee-like structure particles in asphalt binder [6]
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