The three-dimensional stiffness characteristic tests of AC-13 asphalt mixture were conducted under varying temperatures, frequencies, and confining pressures using self-developed triaxial testing equipment. The triaxial tensile-compressive modulus of the asphalt mixture was found to be approximately 1.5 times greater than the uniaxial tensile-compressive modulus, and the dynamic modulus ratio of the triaxial tensile-compressive modulus is between 0.65 and 0.85. The nonlinear variation laws in the triaxial tensile-compressive dynamic modulus with decreasing temperature and increasing frequency ...
