Abstract
This paper describes the rheological properties of PG64, PG70, and PG76 asphalt binders blended with different Sasobit® contents. The rheological properties of the Sasobit®-modified binders were characterized after being subjected to different aging conditions using the dynamic shear rheometer (DSR) and rotational viscometer (RV) according to SuperpaveTM test protocols. The results indicated that the characterization of aging in terms of the Aging Index (AI) depends on the rheological property of the asphalt binder selected for use in evaluating aging, the amount of Sasobit®, the binder type, and the temperature range. Linear relationships between failure temperatures of unaged and short-term-aged asphalt were observed for three binder types. Design charts were developed to select the appropriate Sasobit® content as a function of temperature, taking into consideration the stiffening effects of Sasobit®, using the SuperpaveTM fatigue factor and asphalt mix construction temperatures.
Highlights
In recent years, the prices of carbon-based energy carriers, crude oil, have substantially increased due to concerns about the long-term availability of fossil fuels as energy resources
Because lower Aging Index (AI) values are more desirable
Using AI to evaluate the effects of aging on the characteristics of asphalt binder containing Sasobit® is complicated since it depends on many variables such as binder type, test temperature range and Sasobit® content
Summary
The prices of carbon-based energy carriers, crude oil, have substantially increased due to concerns about the long-term availability of fossil fuels as energy resources. The challenges of the first strategy are clear: new infrastructure for the production and distribution of new energy sources needs to be constructed, while costs must decrease significantly. Even if new non-polluting energy sources are found, it will be many years before they can be produced on a large industrial scale. A significant proportion of the cost of asphalt mix production is associated with supplying the energy needed to raise the aggregate and binder temperatures to the mixing point. The escalating price of crude oil and, as a consequence, the escalating price of asphalt binders has stimulated efforts to reduce asphalt production temperatures and improve the sustainability of asphalt mix production. Lowering the production temperatures of asphalt mixes saves energy, reduces costs, and reduces carbon emissions. Since the adoption of the Kyoto protocol, global efforts have been
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