Precision Estimates for AASHTO Test Method T308 and the Test Methods for Performance-Graded Asphalt Binder in AASHTO Specification M320 (2005) / Chapter Skim
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18 CHAPTER 4: CONCLUSIONS AND RECOMMENDATIONS 4.1 GENERAL This study was conducted to prepare precision estimates for AASHTO standards found in AASHTO Standard Specification M320, "Performance-Graded Asphalt Binder", and for AASHTO Standard Test Method T308, "Determining the Asphalt Binder Content of Hot-Mix Asphalt (HMA) by the Ignition Method".
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19 difficulty in achieving the required rate of temperature rise and improper application of barometric correction. Conclusion: The precision estimates for flash point should be revised.
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20 A review of the data showed that the standard deviation changed for different values of mass loss. Coefficient of variation also was not appropriate since standard deviation was not proportional to mass loss.
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21 Conclusion: A precision and bias statement is needed. Recommendation: It is recommended that the precision and bias statement in Section 4.9 be adopted for T314.
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22 Conclusion: The precision and bias statement currently published in T316-04 should be revised. Recommendation: It is recommended that the precision and bias statement in Section 4.11 be adopted for T316.
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23 4.4 PRECISION STATEMENT FOR AASHTO T308 Determining the Asphalt Binder Content of Hot-Mix Asphalt (HMA) by the Ignition Method X
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24 4.5 PRECISION STATEMENT FOR AASHTO T48 Flash and Fire Points by Cleveland Cup X Precision and Bias X.1 Precision – Criteria for judging the acceptability of test results for flash point of asphalt binder obtained by this method are given in Table X
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25 4.6 PRECISION STATEMENT FOR AASHTO T228 Specific Gravity of Semi-Solid Bituminous Materials X Precision and Bias X.1 Precision – Criteria for judging the acceptability of the relative density results obtained by this method are given in Table X
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26 4.7 PRECISION STATEMENT FOR AASHTO T240 Effect of Heat and Air on a Moving Film of Asphalt (Rolling Thin-Film Oven Test)
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27 Table 2 – Stratified Estimates of Precision Single Operator Precision: Mass Loss (%) 0.0 to 0.1% 0.0079 0.0224 0.1 to 0.2% 0.0115 0.0327 0.2 to 0.3% 0.0152 0.0429 0.3 to 0.4% 0.0188 0.0532 0.4 to 0.5% 0.0224 0.0635 Multilaboratory Precision: Mass Loss (%)
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28 4.8 PRECISION STATEMENT FOR AASHTO T313 Determining the Flexural Creep Stiffness of Asphalt Binder Using the Bending Beam Rheometer (BBR)
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29 4.9 PRECISION STATEMENT FOR AASHTO T314 Determining the Fracture Properties of Asphalt Binder in Direct Tension (DT)
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30 4.10 PRECISION STATEMENT FOR AASHTO T315 Determining the Rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer (DSR)
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31 4.11 PRECISION STATEMENT FOR AASHTO T316 Viscosity Determination of Asphalt Binder Using a Rotational Viscometer X Precision and Bias X.1 Precision – Criteria for judging the acceptability of viscosity results obtained by this method are given in Table X
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