Author/Authors :
Naderi Behzad نويسنده , Nabizadeh Hadi نويسنده he is continuing his education as a PhD student at University of Nevada , Tabatabaee Nader نويسنده his MSc and PhD from The Pennsylvania State University.
Abstract :
The asphalt industry has been at the forefront of sustainable development.
Warm Mix Asphalt (WMA) has been developed to cope with issues such as high energy
prices and air pollution. These mixes require less energy and generate fewer pollutants
during production in comparison with conventional Hot Mix Asphalt (HMA). Although a
promising technology, the durability of WMA is not clear because long-term WMA eld
performance data is limited. This study investigated the susceptibility of Sasobit-modi ed
WMA to moisture, since moisture damage is a major cause of premature pavement failure
in asphalt concrete. To this end, WMA samples were made using di erent concentrations
of Sasobit and the results were compared with those from HMA mixtures. The e ect of
hydrated lime as an anti-stripping agent was also investigated. The tensile strength ratios
indicate that the introduction of hydrated lime and Sasobit increased the resistance of
asphalt mixtures to moisture. Fracture energy and toughness were used to evaluate the
crack resistance of specimens under dry and wet conditions. In comparison with Sasobit,
hydrated lime increased crack resistance of mixtures. The results indicate that hydrated
lime can be used as a compatible and e ective anti-stripping agent for WMAs containing
Sasobit.
