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Publication Number: FHWA-RD-02-034
Date: September 2005
Long-Term Pavement Performance Materials Characterization Program: Verification of Dynamic Test Systems With An Emphasis On Resilient Modulus
Chapter 6. SUMMARY
The procedures outlined here were developed to verify the operation of closed-loop, servohydraulic systems for specific application to the resilient modulus procedure. They have been written to be as general as possible to promote application in a variety of test applications. The user should implement these procedures with an open mind and not in a cookbook approach.
From use of the procedures, many potential sources of error in future testing programs have been identified and rectified. The following are among the problems that have been identified through implementation of the procedures in numerous laboratories:
These examples are not meant to produce fear or anxiety in test operators. Rather, they are illustrative of the types of problems a user can face when implementing a resilient modulus testing program. Use of the verification procedure can alert users to problems with the system and with laboratory processes quickly and efficiently.