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Suggested Citation:"TRB Disclaimer." National Academies of Sciences, Engineering, and Medicine. 2005. Precision Estimates for AASHTO Test Method T308 and the Test Methods for Performance-Graded Asphalt Binder in AASHTO Specification M320. Washington, DC: The National Academies Press. doi: 10.17226/21969.
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ACKNOWLEDGMENT This work was sponsored by the American Association of State Highway and Transportation Officials (AASHTO), in cooperation with the Federal Highway Administration, and was conducted in the National Cooperative Highway Research Program (NCHRP), which is administered by the Transportation Research Board (TRB) of the National Academies. DISCLAIMER The opinion and conclusions expressed or implied in the report are those of the research agency. They are not necessarily those of the TRB, the National Research Council, AASHTO, or the U.S. Government. This report has not been edited by TRB. iii

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TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 71: Precision Estimates for AASHTO Test Method T308 and the Test Methods for Performance-Graded Asphalt Binder in AASHTO Specification M320 includes the results of Phase 3 of NCHRP 9-26, in which data from the AMRL Proficiency Sample Program (PSP) are used to create or update precision estimates for a variety of test methods. These include those methods specified in AASHTO Standard Specification M320, “Performance-Graded Asphalt Binder,” and AASHTO Standard Test Method T308, “Determining the Asphalt Binder Content of Hot-Mix Asphalt (HMA) by the Ignition Method.” The report from Phase 1 of Project 9-26, which was published as NCHRP Web Document 54, includes precision estimates of selected volumetric properties of HMA using non-absorptive aggregates. The report from Phase 2, which was published as NCHRP Web Document 66, discusses the results of an investigation into the cause of variations in HMA bulk specific gravity test results using non-absorptive aggregates.

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