Virtual strain loading method for low temperature cohesive failure of asphalt binder

• DOI: 10.1016/j.jreng.2022.09.004
• Publication Date: 2023-09-09T06:18:27Z
• Authors: Heyang Ding; Hainian Wang; Ziye Ma; Zhen Leng; Ponan Feng; Tangjie Wang; Xin Qu
• Keywords: Asphalt binder; Virtual strain load; Cohesive failure; Maximum cohesive stress; TE1-450; 02 engineering and technology; Molecular dynamics; TA1-2040; Engineering (General). Civil engineering (General); Highway engineering. Roads and pavements; 0201 civil engineering

Cohesive failure is one of the primary reasons for low-temperature cracking in asphalt pavements. Understanding micro-level mechanism crucial comprehending cohesive behavior. However, previous literature has not fully reported on this aspect. Moreover, there been insufficient attention given to correlation between macroscopic and microscopic failures. To address these issues, study employed molecular dynamics simulation investigate tensile behavior binder. By applying virtual strain, separation work during binder was calculated. Additionally, a behaviors established. Specifically, quadrilateral model generated based SARA fractions. various combinations strain loading, at determined. Furthermore, impact loading analyzed. Normalization establish behaviors. The results indicated that thermodynamic classical mechanical indicators validated reliability tetragonal model. combination consists rate number. All exhibited similar characteristic. critical hardly influenced by combination. increasing significantly enhanced both maximum traction stress An increment number led decrease work. 0.5%-80 provided more accurate representation actual asphalt's trend.