沥青结合料疲劳性能的多指标分析OA

Fatigue performance of asphalt materials is a key factor affecting the durability of asphalt mixtures.However,there is a lack of research on the relationship between the conventional performance and fatigue performance of asphalt.In view of this deficiency,this paper selects four kinds of base asphalt and seven kinds of modified asphalt for systematic study of fatigue performance.The fatigue parameters such as shear stress,shear strain and fatigue damage of asphalt samples were tested by linear amplitude scanning tests.The fatigue life of asphalt under different stress levels was calculated by viscoelastic continuum damage model.Based on the six parameters of softening point,yield energy,toughness ratio,peak force,shear strength and improved boiling method adhesion rating,the multiple linear regression analysis of the above parameters and asphalt fatigue life was carried out by SPSS software,and the key parameters affecting asphalt fatigue performance were screened and their quantitative correlation rules were clarified.The results show that the fatigue performance of different types of asphalt has obvious differences.The neat asphalt exhibits a higher sensitivity to variations in shear stress compared to the modified asphalt,while its fatigue performance is relatively inferior.The base asphalt exhibits a higher sensitivity to variations in shear stress compared to the modified asphalt,while its fatigue performance is relatively inferior.The fatigue damage curves of different asphalt materials are different,but their evolution laws are roughly the same.In addition to high modulus asphalt,modified asphalt shows better anti-fatigue damage performance.Their fatigue performance is significantly influenced by both the dosage and the type of modifying agents employed.Multiple linear regression analysis has identified the softening point,yield energy,toughness ratio,peak force,shear strength and adhesion rating as critical parameters governing asphalt fatigue performance.These findings provide valuable technical references for evaluating the fatigue characteristics of asphalt binders.