Abstract
In order to study the influence of freeze-thaw cycles on the multi-axial strength of AC (Asphalt Concrete)-13 and SMA (Stone Mastic Asphalt)-13 asphalt mixtures which are widely used in China, triaxial tests were carried out in the laboratory. Two nonlinear failure criterions under three-dimensional stress states in octahedral space were established. A linear model for engineering design and its simplified testing method were then presented. The three-dimensional failure criteria of asphalt mixtures after 0, 1, 3, 5, 10, 15, 20 freeze-thaw cycles were also proposed. The results indicated that the multi-axial strength decayed significantly after 20 freeze-thaw cycles. It is noteworthy that the strength degrades rapidly during the first 5 freeze-thaw cycles. Compared with AC-13 asphalt mixture, the SMA-13 asphalt mixture exhibits better performance on the resistance to freeze-thaw damage, and it is recommended as the upper surface layer material of pavement structure.
Highlights
Asphalt pavement is influenced by freeze-thaw cycles in the middle and lower reaches of the Yangtze River and some seasonally frozen areas of China in winter
Based on the triaxial test results, the SMA-13 asphalt mixture has a higher strength in three-dimensional stress states compared with AC-13
Compared with the continuous-graded AC-13 asphalt mixture, the gap-graded SMA-13 asphalt mixture exhibits better resistance to freeze-thaw damage under complex stress conditions. This is mainly because SMA-13 is a framework-dense structure and AC-13 is a suspend-dense structure, the SMA-13 asphalt mixture consists of a coarse aggregate skeleton which has a high binder content and a low air void content, and there are some fibers in the mixture [31,32,33]
Summary
Asphalt pavement is influenced by freeze-thaw cycles in the middle and lower reaches of the Yangtze River and some seasonally frozen areas of China in winter. Study the While effects the complex for the triaxial compressive stress state with confining pressure if the first principal stress 1 in asphalt pavement in the laboratory, as well as to perform triaxial tests As it testing) for AC (Asphalt Concrete)-13 and SMA (Stone Mastic Asphalt)-13 asphalt mixtures after is difficult to study the multi-axial strength properties of asphalt mixtures [28,29], the freeze-thaw cycles with the self-developed triaxial test method. From the strength point exhibits better freeze-thaw resistance under complex stress condition compared with the AC-13 asphalt mixture It is recommended as the upper surface layer material of pavement structure
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