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    Effect of Carbon Black on the High and Low Temperature Properties of Bitumen
    (Springer, 2018) Geckil, Tacettin; Ahmedzade, Perviz; Alatas, Taner
    In the present study, the effect of carbon black (CB) as an additive on resistance of bitumen to delay or prevent rutting and low temperature cracking was investigated. For this purpose, different amounts of CB (0, 5, 10, and 15 wt%) were added into bitumen with PG 58-28. Conventional tests (penetration, softening point, Fraass breaking point, ductility, and kinematic viscosity) and Superpave binder tests (rotational viscosity, dynamic shear rheometer, and bending beam rheometer test) were carried out to determine the physical and rheological properties of pure and modified bitumens. In addition, high and low temperature performance grades of pure and modified bitumens were identified according to Superpave binder specification. The results indicated that the addition of CB increased the stiffness and resistance of bitumen to rutting at high temperatures and resistance to thermal cracking at low temperatures of bitumen. Finally, the bitumen becomes more elastic and less susceptible to temperature changes.
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    Investigation of Shear Complex Modulus and Phase Angle Values of Short- and Long-term Aged Polymer Modified Bitumens at Different Frequencies
    (Korean Society Of Civil Engineers-Ksce, 2014) Alatas, Taner; Yilmaz, Mesude; Kuloglu, Necati; Cakiroglu, Mehmet; Geckil, Tacettin
    In this study, modified bitumens were prepared by mixing two types of Styrene-Butadiene-Styrene (SBS-D and SBS-M) and Ethylene-Vinyl-Acetate (EVA) with B 160/220 base bitumen 3% by weight. The short- and long-term aging processes were applied to base and modified binders with rolling thin film oven test and pressure aging vessel, respectively. Dynamic Shear Rheometer (DSR) test conducted at different temperatures and frequencies showed that while the shear complex modulus (G*) of unaged, short- and long-term aged binders reduced, the phase angle (delta) of those increased. The shear complex modulus values increased and the phase angle values decreased by the effect of aging and increase in frequency. The G*/sin delta values increased with the addition of modifiers to the base bitumen. Comparison of modifiers demonstrated that the effective modifier type shows variety according to frequency, temperature and aging conditions.