Correlation of Resilient and Seismic Modulus Test Results

The most common test to evaluate the representative modulus and nonlinear behavior of base and subgrade materials is the resilient modulus test. Due to the comprehensive nature of the method, the preparation and testing of one specimen may take up to 6 h. For field quality control, a more rapid method of determining the in-place modulus is desirable. One way to achieve this goal is through in situ seismic methods. However, since the seismic tests provide small-strain moduli whereas the resilient modulus tests measure moduli at higher strains, some additional considerations must be taken into account to relate these two moduli. This paper presents some possibilities for relating these tests in a rational manner.