Estimation of low temperature properties of RAP binder without extraction : final report.
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2016-04-01
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Edition:Final report
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Abstract:In recent years, the use of reclaimed asphalt pavement (RAP) as a component of asphalt mixtures has
become a common practice. For many years, researchers and DOT officials have questioned the adverse
effects, if any, of using solvents to extract and recover the binder. Therefore, researchers have been
investigating new methods, without extraction techniques, of estimating the RAP binder properties,
especially with respect to the low-temperature characteristics of binders and the mixtures. The major
goal of this research project was to determine if the low-temperature properties of the aged asphalt
binder in RAP could be obtained by using the fines (-#50 to +#100) generated from sieved RAP
materials rather than from the binder extracted from the RAP. In addition, the low-temperature
characteristics of several mixtures containing RAP were studied and evaluated for any correlation with
the binder properties. Several samples were made with different RAP sources, different percentages of
RAP content, various low temperatures (i.e., 0, -6, -12, and -18 °C), and at many states (i.e., virgin,
RTFO, and PAV). In addition, some of the RAP sources were obtained after one year and BBR testing
was conducted. Other testing procedures and specifications such as indirect tensile strength and semicircle
bending (SCB) were used and evaluated.
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