How does the isophthalic unsaturated polyester affect the dielectric properties, the glass transition, and the ductility of bitumen?

Ulutas K., YAKUT S., BOZOĞLU PARTO D., Sitilbay B., KARAŞAHİN M., Yardim S., ...More

Road Materials and Pavement Design, vol.25, no.6, pp.1324-1339, 2024 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 6
  • Publication Date: 2024
  • Doi Number: 10.1080/14680629.2023.2266527
  • Journal Name: Road Materials and Pavement Design
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Compendex, ICONDA Bibliographic, INSPEC
  • Page Numbers: pp.1324-1339
  • Keywords: AC conductivity, Bitumen, bitumen, bitumen modified with unsaturated polyester resin, dielectric relaxation, dielectric spectroscopy, glass transition temperature, glass transition temperature, modification, polyester, thickness
  • Istanbul Gelisim University Affiliated: Yes


Bitumen with 50/70 penetration was prepared and modified by doping with the unsaturated polyester resin based on isophthalic acid at 5% by weight (w/w%). The structural, mechanical, and thermal properties of bitumen and bitumen modified with unsaturated polyester resin %5 (UPR) were determined. The dielectric properties of bitumen and modified bitumen were investigated in the frequency and temperature ranges of 0.1-106 Hz and (-)40°C- 40°C, respectively. Polarization mechanisms, glass-transition temperature, and ductility of all samples were determined and compared to each other. The glass transition temperature of the modified bitumen shifts toward low temperatures in comparison to the bitumen. So, it can be suggested that the use of modified bitumen is very attractive in regions where the temperature differences are high. Also, the dielectric analysis method is an innovative alternative to determining modified bitumen's low-temperature performance. It was found that the modification with UPR provide strength and flexibility to asphalt.