Equipment developed to determine the dynamic properties of paving materials in axial and torsional loading is described. Dynamic properties were determined by the excitation of hollow cylindrical specimens using two independent sinusoidal loads with frequencies up to 30 Hz. An IBM PC/AT equipped with a Metrabyte DASH16 data acquisition board was used to directly control two MTS hydraulic servorams. Menu-driven software was developed, taking advantage of direct memory access channels, so that data acquisition, wave form generation, and closed-loop control could take place simultaneously at rates above 5,000 samples/sec/channel. To convert raw data into graphs and parameters representative of dynamic material properties, a postprocessing menu-driven program was also developed. Dynamic properties of an asphalt concrete, a uniform sand, and a silty clay are presented. For the asphalt concrete, dynamic moduli in axial loading, dynamic shear moduli, internal damping determined in both axial and shear loading, and dynamic Poisson's ratios are presented for tests conducted at temperatures ranging from 11 deg C to 40 deg C. For the uniform sand and silty clay, dynamic shear moduli and internal damping as a function of stress state, magnitude of shear strain, and frequency of loading are presented.