Asphalt rheology and strengthening through polymer binders : final report.
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2016-11-01
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Abstract:This term paper investigates the influences of polymer modifications to asphalt rheology as compared to
conventional asphalt pavement sections. The addition of 2% to 3% of polymers into the wearing and base courses
of asphalt (flexible) pavements have been known to enhance the engineering characteristics of traditional asphalt as
a binder which offers longer life expectancy and increased capacity, increased resistance to fatigue cracking,
increased resistance to rutting (permanent deformation), improved thermal-stiffness performance at high and low
extreme temperatures, increased resistance to tension cracking, increased resistance to stripping, and reduce binder
drain down. Polymers are classified in this paper into their major respective categories with the most common types
presented and described in detail. Challenges related to the usage, rheology, and practical implementation of
polymer modified asphalt are discussed. Standardized and non-standardized tests and experiments related to the
physical and rheological characterization of asphalts and polymer-modified are also presented. Recent research has
focused on the sustainability concepts for the application of polymer modified asphalt for high-recycled asphalt
mixtures to achieve similar or better engineering characteristics as compared to conventional asphalt pavement
mixtures. The sustainable benefits of using high-reclaimed asphalt pavement with the addition of polymer and
rejuvenator modifications include reduced landfill / stockpile dependence, reduced greenhouse gas emissions from
less required virgin binder from oil barrels, and possible economic benefits depending on the true-costs of the
project. To achieve comparable or better rheological properties for high-recycled asphalt pavement high-polymer
modified asphalt can be used with between 7% and 8% polymer additions. Furthermore, high-polymer modified
asphalt is shown to be applicable to applications such as highly traveled highways, when thinner layers of pavement
is required and long-life expectancy is critical when combined with increasing traffic intensities and loads.
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