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OCR for page 228
CHAPTER 3 Asphalt Binders This chapter of the Manual presents information on asphalt binders. This includes background information of a more detailed nature than that provided in Chapter 2, such as brief discussions of asphalt refining, temperature sensitivity, and age hardening. Performance grading of asphalt binders is described in some detail, including discussion of the various test methods involved and presentation of some of the pertinent specifications in tabular format. The chapter concludes with a few paragraphs giving practical guidelines for the selection of binders during the mix design process. Figure 3-1 is a plot of dynamic shear modulus ( G* ) as a function of temperature at 10 rad/s for a typical asphalt binder. This figure represents actual data for a PG 64-22 binder. Table 3-1 presents details of the current standard for performance-graded asphalt binders, as described in AASHTO M320. Table 3-1 includes low temperature grading solely based on the bending beam rheometer (BBR); the direct tension test is not used for this purpose. AASHTO M320 contains different tables for low temperature grading with the BBR and the direct tension test; the direct tension grading is omitted in this chapter in the interest of brevity and because grading using the BBR is much more common. 228