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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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Suggested Citation

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. https://doi.org/10.17226/21969.

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8.5 x 11 |  DOI: https://doi.org/10.17226/21969
Chapters skim
Precision Estimates for AASHTO Test Method T308 and the Test Methods for Performance-Graded Asphalt Binder in AASHTO Specification M320 1-1
About the National Academies 2-2
TRB Disclaimer 3-3
Contents 4-5
List of Tables 6-6
Acknowledgments 7-7
Chaper 1: Introduction and Research Approach 8-10
Chapter 2: Analysis Technique 11-17
Chapter 3: Results of Analysis and Estimates of Precision 18-24
Chapter 4: Conclusions and Recommendations 25-38
References 39-39
Bibliography 40-40
Appendix A: Description of Hoaglin et al. Outlier Method 41-41
Appendix B: Example of Analysis Technique 42-45
Appendix C: Summary Table for DSR Phase Angle Testing on Original Binder 46-46
Appendix D: Normal Summary Tables 47-47
Appendix E: Graph and Analysis Results for AASHTO T308 48-50
Appendix F: Graph and Analysis Results for AASHTO T48 51-58
Appendix G: Graph and Analysis Results for AASHTO T228 59-66
Appendix H: Graph and Analysis Results for AASHTO T240 67-74
Appendix I: Graph and Analysis Results for AASHTO T313, Slope 75-82
Appendix J: Graph and Analysis Results for AASHTO T313, Stiffness 83-90
Appendix K: Graph and Analysis Results for AASHTO T314, Stress 91-98
Appendix L: Graph and Analysis Results for AASHTO T314, Strain 99-106
Appendix M: Graph and Analysis Results for AASHTO T315, Original 107-114
Appendix N: Graph and Analysis Results for AASHTO T315, RTFO 115-122
Appendix O: Graph and Analysis Results for AASHTO T315, PAV 123-130
Appendix P: Graph and Analysis Results for AASHTO T316 131-138

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