Rheological methods of characterization of regular and modified bitumens are studied. The fractional model of a complex modulus is inverted to generate the corresponding molecular weight distribution. A possibility to obtain more information about the structure of bitumens via the phase angle is investigated. The problem of a calibration equation is briefly discussed. The presence of polymer additives in modified bitumens is manifested on the molecular weight distribution obtained from the phase angle.
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Zanzotto et al. (1996) studied this question.
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