Akademik Veri Yönetim Sistemi
TEKNIK DERGI/TECHNICAL JOURNAL OF TURKISH CHAMBER OF CIVIL ENGINEERS, cilt.33, sa.2, ss.11779-11798, 2022 (SCI-Expanded)
The effectiveness of natural Gilsonite on the performance properties of modified bitumens
was studied. Three samples having different ratios of Gilsonite that are 6%, 8% and 10% by
weight of base bitumen which was PG 64-16 grade were prepared. The physical properties
and storage stabilities of four samples were investigated by means of conventional tests. The
short-term and long-term aging processes of bitumens were conducted with rolling thin oven
and pressure aging vessel tests, respectively. Rheological properties of bitumens were
examined by means of Superpave tests such as rotational viscosity, dynamic shear rheometer
and bending beam rheometer. After the rheological study, the low and high temperature
performance classes of bitumens were determined by the Superpave specification. The results
showed that natural Gilsonite-modified bitumens provide improvement in rheological and
physical properties of bitumen, and were found highly compatible with base bitumen.
Gilsonite additive significantly increased stiffness and viscosity of bitumen, and improved
the resistance against fatigue cracking and rutting of bitumen, without causing a reduction in
thermal cracking resistance of bitumen.