Determination of optimum limestone filler content in asphalt mastic by dielectric spectroscopy


Ulutas K., BOZOĞLU PARTO D., YAKUT Ş., DELİGÖZ H., Sitilbay B., KARAŞAHİN M., ...More

Road Materials and Pavement Design, 2024 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Publication Date: 2024
  • Doi Number: 10.1080/14680629.2024.2331194
  • Journal Name: Road Materials and Pavement Design
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Compendex, ICONDA Bibliographic, INSPEC
  • Keywords: Asphalt mastic, dielectric properties, dielectric spectroscopy, glass transition temperature, glass transition temperature, hot mix asphalt design, limestone, limestone, Subject classification codes: Bitumen, volume fraction
  • Yıldız Technical University Affiliated: Yes

Abstract

The rheological and dielectric characteristics of asphalt mastics with different ratios of limestone filler were analyzed and compared with each other for road pavement applications. The dielectric properties of asphalt mastics are studied as a function of frequency (0,1–106 Hz) at different temperatures ((-)40°C−40°C). The glass transition temperature and the relaxation behaviour were determined by Vogel–Fulcher-Tamman and Cole–Cole equations, respectively. The free volume fraction was calculated by the Dolittle equation. The filler ratio dependence of the dielectric properties was attributed to the variation of the void fraction. This result was related to the glass transition temperature and ductility. The sample with 6 wt% limestone filler showed the highest dielectric constant value among all samples for all temperatures due to the excellent adhesion between binder and filler. Consequently, it was determined to be the optimum value to design hot mix asphalt for use in territories with high-temperature differences.