Geocomp’s LoadTrac II Resilient Modulus unit fully automates resilient modulus tests on base/subbase/subgrade materials. The LoadTrac II meets or exceeds all specifications for Resilient Modulus Testing of Base/Subbase/Subgrade Materials by AASHTO T 294/T 307, SHRP Protocol P46, and NCHRP RPT 285. It generates a complete final test report with graphs and table values as well as constitutive realtionships based on publication No. FHWA-RD-97-083. It minimizes man time during testing and offers a versatile platform for performing additional geotechnical tests.

Resilient modulus is a complicated test in which the stiffness of the sample changes with loading. Since the performance of cyclic loading systems depends on the stiffness of the sample, most systems fail to apply the correct load throughout the test. Geocomp’s RM system uses a very sophisticated adaptive control that makes real-time adjustment of a PID controller to adjust the system control parameters as the stiffness of the specimen changes. This feature permits our system to apply an accurate load from the beginning to the end of the test.