Application of the surface free energy method on the mechanism of low-temperature cracking of asphalt mixtures. (25th January 2021)

• Record Type: Journal Article
• Authors: Naseri Yalghouzaghaj, Mikaeil; Sarkar, Alireza; Hamedi, Gholam Hossein; Hayati, Parham
• Is Part Of: Construction & building materials. Volume 268(2021)
• Publication Date: 2021-01-25
• Subjects: Asphalt mixture -- Low-temperature cracking -- Surface free energy -- Pull Off test -- Cohesive failure -- Adhesive failure; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.121194
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Binder with a lower low performance temperature had larger nonpolar properties. Softer asphalt binders had higher cohesion free energy than stiffer binders. The effect of aggregate on the cohesion was much less than that of the binder. Both binder and aggregate were important in the Pull Off adhesion strength. Cohesion free energy and m-value had no significant effect on adhesion pull off. Abstract: This study investigated the role of the basic properties of materials in the low-temperature cracking using thermodynamic theory concepts. The Pull Off direct tensile strength test was conducted on 32 asphalt mixtures in two states of cohesive and adhesive. The statistical analysis in the cohesive failure state demonstrated that the adhesion free energy of the asphalt binder-aggregate was not effective in this cohesion failure. Also, the cohesion mode results showed that stiffness of asphalt binder has negative and cohesion free energy, specific surface area and base-to-acid ratio of the aggregate have positive effect on the low-temperature strength of asphalt mixtures.