Precision Estimates for AASHTO Test Method T 269 Determined Using AMRL Proficiency Sample Data (2007) / Chapter Skim
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4 CHAPTER 2. RESULTS OF ANALYSIS AND ESTIMATES OF PRECISION 2.1 TEST DATA The individual results for each of the 12 proficiency data sets used to create precision estimates can be found in Appendices A to D
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5 Table 2-2- Summary Table for Precisions of Gmm & Gmb (Marshall Apparatus) Average Results Repeatability Reproducibility Sample Type No.
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6 Table 2-4- Pooled Precisions for T269 using Precisions of % Air Voids and Precisions of Gmm & Gmb (Marshall Apparatus) Data Type Pooled Repeatability 2ds Pooled Reproducibility 2ds HMD Air voids 0.48 1.36 1.08 3.06 HMD Gmb & Gmm 0.47 1.33 1.03 2.91 As it is observed from Table 2-4, the pooled repeatability and reproducibility precision computed from Gmm and Gmb data and from the air void data are not significantly different.
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7 Table 2-6- Summary Table for Precisions of Gmm & Gmb (California Kneading Compactor) Average Results Repeatability Reproducibility Odd Samples Even Samples Sample Type Sample Number No.
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8 Table 2-8- Pooled Precisions for T269 using Precisions of % Air Voids and Precisions of Gmm & Gmb (California Kneading Compactor) Data Type Pooled Repeatability 2ds Pooled Reproducibility 2ds HMD Air voids 0.52 1.47 1.39 3.93 HMD Gmb & Gmm 0.61 1.73 1.41 3.99 2.2.3 Standard Practice for Preparation of Test Specimens of Bituminous Mixtures by Means of Gyratory Shear Compactor, ASTM D4013 The precisions resulting from analysis of percent air voids for specimens compacted by means of the Gyratory Shear Compactor are found in Average Results Repeatability Reproducibility Reproducibility Sample Type No.
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9 Table 2-9- Precisions of % Air Voids based on Analysis of Air Void Data (Gyratory Shear Compactor) Average Results Repeatability Reproducibility Reproducibility Sample Type No.
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10 Average Results Repeatability Reproducibility Reproducibility Sample Type No. of Labs Odd Samples Even Samples Odd Samples Even Samples Sample Number Grade Odd Samples Even Samples 1s CV% CV% 1s CV% 1s CV% HMD 41 & 42 20 70-22 5.25 4.92 0.62 11.7 12.5 1.74 33.2 2.02 41.0 HMD 43 & 44 22 64-10 5.44 4.65 0.48 8.8 10.3 1.17 21.5 1.59 34.3 HMD 45 & 46 25 64-22 4.20 4.17 0.39 9.2 9.3 0.93 22.08 0.90 21.6 and Table 2-11 indicates that the form of the precision estimates should be based on the sample standard deviation.
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11 the repeatability and reproducibility statistics in Table 2-13 and Table 2-15 indicates that two methods of analysis provide comparable precision limits. A review of the data shown in Table 2-13 and Table 2-15 indicates that the form of the precision estimates should be based on the sample standard deviation.
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12 Table 2-14- Summary Table for Precisions of Gmm & Gmb (Superpave Gyratory Method) Average Results Repeatability Reproducibility Odd Samples Even Samples Sample Type Sample Number No.
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