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From page 1... ... NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM Senior Program Officer: Edward T Harrigan April 2014 C o n t e n t s Chapter 1 -- Introduction and Research Approach, 1 1.1 Background, 1 1.2 Research Objective, 1 1.3 Scope of Study, 2 1.4 Proficiency Samples Used in This Study, 2 Chapter 2 -- Analysis of Results, 3 2.1 Precision Estimates of T 201, 3 2.2 Precision Estimates of T 202, 6 2.3 Precision Estimates of T 49, 9 Chapter 3 -- Conclusions and Proposed Changes to standard test Methods, 16 3.1 Conclusions, 16 3.2 Proposed Changes to AASHTO Standard Test Methods T 201, T 202, and T 49, 17 References, 18 Unpublished Appendixes, 18 Appendix F, 18 Appendix G, 19 Appendix H, 19 PReCIsIon estIMAtes oF AAsHto t 201, AAsHto t 202, And AAsHto t 49 nCHRP Project 10-87, task order #2 This digest presents results of Task Order #2 of NCHRP Project 10-87, "Precision Statements for AASHTO Standard Methods of Test." This work was conducted to update precision estimates of three test methods pertaining to asphalt binder: T 201, T 202, and T 49. Read the entire page →
From page 2... ... 21.3 scope of study The scope of the project included the following major activities: 1. Update precision estimates of AASHTO T 201, T 202, and T 49. Read the entire page →
From page 3... ... 3CHAPteR 2 -- AnALYsIs oF ResULts This chapter includes summaries of the data and the resulting precision estimates. The individual results for each of the 168 proficiency data sets analyzed in this study can be found in Appendixes C through E, which are not published herein, but can be found online at http://www.trb.org by searching for NCHRP Project 10-87. Read the entire page →
From page 4... ... 4table 2-2 Summary of statistics for kinematic viscosity (AASHTO T 201) of 21 sets of rolling thin film oven (RTFO) Read the entire page →
From page 5... ... 5RTFO residue (R2 of 0.27 and 0.55) Read the entire page →
From page 6... ... 6coefficient of variation for the original asphalt is 1.3% and for the RTFO residue is 1.7%. These values are significantly larger than the existing single-operator coefficient of variation of 0.64% for kinematic viscosity of asphalt cement at 135°C in ASTM D 2170-10. Read the entire page →
From page 7... ... 7A review of the data in Table 2-4 and Table 2-5, as presented in Figure 2-3 and Figure 2-4, suggests that there are relationships between the standard deviations and the average viscosity values. Meanwhile, there are weak relationships between the average values and the repeatability or reproducibility coefficient of variations. Read the entire page →
From page 8... ... 8y = 0.02x - 3.71 R² = 0.96 -20.00 0.00 20.00 40.00 60.00 80.00 100.00 120.00 140.00 160.00 0.0 1000.0 2000.0 3000.0 4000.0 5000.0 6000.0 7000.0 ST D, P a. s Average, Pa.s Repeatability Standard Deviation vs. Read the entire page →
From page 9... ... 9and increase of 89% (corresponding to RTFO residue) in the multilaboratory coefficient of variation of viscosity by vacuum capillary. Read the entire page →
From page 10... ... 10 table 2-8 Summary of statistics for penetration (AASHTO T 49) of RTFO-aged asphalts at 4°C of 21 sets of VGAC sample pairs. Read the entire page →
From page 11... ... 11 203-204 156 54.9 54.8 1.67 3.0 3.0 3.30 6.1 3.30 6.0 201-202 154 92.6 92.4 1.79 1.9 1.9 4.80 5.2 4.80 5.2 199-200 152 128.9 128.7 2.09 1.6 1.6 6.60 5.1 6.30 4.9 197-198 153 88.9 88.6 1.42 1.6 1.6 3.70 4.2 3.40 3.8 195-196 157 39.5 39.7 1.39 3.5 3.5 3.40 8.5 3.40 8.4 193-194 164 56.2 56.4 1.42 2.5 2.5 3.50 6.2 3.60 6.5 table 2-9 (Continued) Repeatability Reproducibility PSP Sample No. Read the entire page →
From page 12... ... 12 y = 0.01x + 0.75 R² = 0.05 0 0.5 1 1.5 2 0 10 20 30 40 50 ST D, U ni ts Average, Units Repeatability Standard Deviation vs. Average (AASHTO T49-Original Binder, 4°C) Read the entire page →
From page 13... ... 13 y = 0.01x + 0.73 R² = 0.21 0 0.5 1 1.5 2 2.5 0 20 40 60 80 100 120 140 Average, Units Repeatability Standard Deviation vs. Average (AASHTO T49-Original Binder, 25°C) Read the entire page →
From page 14... ... 14 precision estimate equations for the penetration values at 4°C and 25°C. For 4°C, there is one equation for each single-operator and multilaboratory precision. Read the entire page →
From page 15... ... y = 0.01x + 0.75 R² = 0.05 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 0 10 20 30 40 50 ST D, U ni ts Average, Units Repeatability Standard Deviation vs. Average (AASHTO T49-Original Binder, 4°C) Read the entire page →
From page 16... ... 16 original asphalt provides larger standard deviation values than do the existing equations for the range of penetration of 30 to 80 units. For the average pen etration larger than 80 units, the new equation provides smaller standard deviations than does the existing equation. Read the entire page →
From page 17... ... 17 However, the new precision estimates, separated between the viscosity of original asphalt and the RTFO residue, set the allowable difference between two laboratories' results as 8.8% of the mean for the original asphalt and 19.7% of the mean for the RTFO residue. The differences in the new and existing precisions may arise from using a wider range of asphalt binders for preparing the new precision estimates than those used for preparing the existing precisions, although this cannot be confirmed. Read the entire page →
From page 18... ... 18 3.2.2 AASHTO T 202 It is proposed that the precision and bias statement in Appendix G be adopted for AASHTO T 202. This is in consideration of the differences between the current repeatability and reproducibility precision estimates in ASTM D 2171 and those developed in this study. Read the entire page →
From page 19... ... 19 APPendIX G -- PReCIsIon stAteMent FoR AAsHto t 202 Viscosity of Asphalts by Vacuum Capillary Viscometer X Precision and Bias X.1. Read the entire page →
From page 20... ... 20 table X Precision estimates of penetration of bituminous materials. Condition of Test and Test Property Standard Deviation 1sa,b Acceptable Range of Two Test Results d2sa,b Single-operator precision: 4°C Original 1s = 0.01X + 0.8 1s = (0.01X + 0.8) Read the entire page →
From page 21... ... Transportation Research Board 500 Fifth Street, NW Washington, DC 20001 These digests are issued in order to increase awareness of research results emanating from projects in the Cooperative Research Programs (CRP) Read the entire page →

From page 1...

... NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM Senior Program Officer: Edward T Harrigan April 2014 C o n t e n t s Chapter 1 -- Introduction and Research Approach, 1 1.1 Background, 1 1.2 Research Objective, 1 1.3 Scope of Study, 2 1.4 Proficiency Samples Used in This Study, 2 Chapter 2 -- Analysis of Results, 3 2.1 Precision Estimates of T 201, 3 2.2 Precision Estimates of T 202, 6 2.3 Precision Estimates of T 49, 9 Chapter 3 -- Conclusions and Proposed Changes to standard test Methods, 16 3.1 Conclusions, 16 3.2 Proposed Changes to AASHTO Standard Test Methods T 201, T 202, and T 49, 17 References, 18 Unpublished Appendixes, 18 Appendix F, 18 Appendix G, 19 Appendix H, 19 PReCIsIon estIMAtes oF AAsHto t 201, AAsHto t 202, And AAsHto t 49 nCHRP Project 10-87, task order #2 This digest presents results of Task Order #2 of NCHRP Project 10-87, "Precision Statements for AASHTO Standard Methods of Test." This work was conducted to update precision estimates of three test methods pertaining to asphalt binder: T 201, T 202, and T 49.