摘要：AbstractThe problem of asphalt pavement rutting is getting worse, which affects driving safety seriously and reduces pavement life greatly. Through comparative analysis, a single penetration repeated shear test (SPSFT) for a research on asphalt mixture permanent deformation was put forward. Many SPSFT tests on different load levels were did with four kinds of most commonly used asphalt mixtures in the upper and middle layer of asphalt pavements. Some conclusions were the followings: (1) The three-stage permanent deformation behavior of asphalt mixtures on loads could be got by SPSFT. (2) The bigger the load, the faster the permanent deformation of asphalt mixtures increases, and the smaller the fatigue life. (3) Mixtures with modified asphalt had a greater ability resistance to shear deformation than with conventional asphalt. (4) Large load (≥1.3MPa) made the large deformation with not large load cycles and the mixture broke; but the smaller load (≤1.1MPa) got very slow increase of the deformation, which was stably in the second stage of three-stage permanent deformation and didn’t broke. (5) The asphalt mixtures with bigger shear strength had a greater ability resistance to shear deformation. (6) Load stress levels had an equivalence to load cycles.
