U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
|This report is an archived publication and may contain dated technical, contact, and link information|
|Publication Number: FHWA-RD-96-176 Date: January 1997|
Publication Number: FHWA-RD-96-176
Date: January 1997
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As part of the Federal Highway Administration's (FHWA) Long-Term Pavement Performance Program (LTPP) Materials Characterization effort, a quality control/quality assurance (QCIQA) program for the resilient modulus testing of unbound granular materials (LTPP Protocol P46) has been developed. The P46 resilient modulus test protocol was developed to ascertain the strength of pavement base, subbase, and subgrade materials. This test is performed at stress states that are comparable to in-situ pavement conditions. The resilient modulus testing generally regarded as a research~type procedure, has historically been performed in a university setting and on a relatively small number of samples. Because the modulus value derived from this testing process is a key parameter for pavement design, the test is being performed for the LTPP program in a production testing environment in what may be the largest single resilient modulus testing program ever undertaken. It is of paramount importance to provide the LTPP researchers with the highest quality data possible. As such, a quality control/quality assurance (QC/QA) procedure was developed to verify the ability of the laboratory equipment and personnel to perform P46 resilient modulus testing for the LTPP program. This report describes the procedure used by the FHWA to perform this verification process. The concepts and testing processes outlined in this report can be applied to many test procedures and a variety of test equipment. The implementation of this procedure in the FHWA LTPP contractor laboratories has had a great impact on achieving repeatable, reliable, high quality resilient modulus data for the LTPP program.
Charles Nemmers, Director
Office of Engineering, Research and Development
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