Abstract
This paper aims to clarify the shear deformation behavior of double-layer asphalt mixtures using the virtual uniaxial penetration test (UPT) with a discrete element method. For this purpose, asphalt mixtures with two different nominal maximum aggregate sizes were designed for the preparation of double-layer wheel tracking test specimens. Then, the cylindrical cores were prepared from the specimens and were cut for capturing the longitudinal profile images. These images were used to reconstruct a two-dimensional discrete element model (DEM) of the uniaxial penetration test specimen. The results indicate that the shear deformation behavior of the asphalt mixtures showed corresponding changes under the virtual loading. The tensile and compressive stress were distributed unevenly within the upper layer after the test, and both coarse aggregates and asphalt mortars bore a greater shear stress. Therefore, cracks were more likely to occur in the upper layer, leading to the failure of the specimens. This process enhanced the bonding between the asphalt mortars and the mineral aggregates. The aggregate particles in the upper layer moved more vertically, while those in the lower layer generally moved more laterally under the virtual loading. This behavior reveals the rutting mechanism of asphalt pavement.
Highlights
Rutting is known to represent a serious type of asphalt pavement distress that influences the safety of the road and the quality of the ride
This study aims to analyze the shear deformation behavior of a double-layer asphalt mixture using the virtual uniaxial penetration test with a discrete element model
The servo control program was written in friendly interactive shell Test (FISH) language so as to continuously adjust the speed of Thestructural servo control program written in FISHthe language as to continuously adjust the speed of the boundary wallwas in order to achieve requiredsocontact force, which was adopted as the the structural boundary wall in order to achieve the required contact force, which was adopted as the loading way in this study
Summary
Rutting is known to represent a serious type of asphalt pavement distress that influences the safety of the road and the quality of the ride. In the SHRP-A-318 research report, pavement rutting is defined as the result of the combination of the compaction deformation and the transverse flow deformation of the asphalt mixture under numerous repeated traffic loadings [1,2]. B. Birgisson pointed out that the rutting was caused primarily by the shear deformation of the upper layer asphalt mixtures due to the failure to resist frequent repeated shear stress, which is generally accepted by most road engineers [3]. It is difficult to determine the exact shear strength of asphalt mixtures by shear performance analysis. The composition of an asphalt mixture, the internal structure formed by the joint action of the aggregates, and the service conditions are the internal factors that determine its bearing capacity and service performance.
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