ABSTRACT
As the obvious viscoelasticity property of asphalt mixture, the loading rate is surely one of the most important factors affecting the mechanical performance of asphalt mixture. Therefore torsional shear test of asphalt mixture is definitely a reasonable proper method to determine the shear resistance. In this paper, based on self-assembled torsional shearing test device, AC13 dense-graded asphalt mixture was prepared to form 10 sets of square specimens to undergo the shearing failure test through which the maximum shear stress τ max, the maximum shear strain γ max, the shear modulus G and the corresponding load time Δt were obtained under different torsional loading angular rates between 0.1 ~ 1.0 rad/s (interval 0.1 rad/s) at 20°C. It turns out that with the increase of ω, τ max gradually increases and reaches the maximum at the point of ω = 0.6–0.7 rad/s after which τ max declines slowly, and γ max rises little by little all the way, and G goes a little bit up firstly and then steadily decreases to the end, and Δt is obviously rapidly falling down and finally to a stable state.
