Precision Estimates of AASHTO T 180: Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop (2010) / Chapter Skim
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16 CHAPTER 4- ANALYSIS OF PROFICIENCY SAMPLE RESULTS 4.1 Proficiency Sample Data The results of three most recent rounds of AMRL Soil Classification and Compaction Proficiency Sample Program were analyzed to determine precision estimates for AASHTO T 180. For each round of testing, test results were obtained for a pair of samples.
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17 4.3 Testing Instructions Laboratory participants were provided with the testing instructions. The copies of the instructions are provided in Appendix C
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18 ILS materials and the average optimum moisture content of the PSP materials is significantly higher than that of the ILS samples. Therefore, inclusion of PSP statistics in the development of precision statement provides precision coverage for a wide range of materials.
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19 Table 4-4. Precision estimates of maximum density and optimum moisture content from PSP data Condition of Test and Test Property 1s d2s Maximum Unit Weight (lbf/ft3 )
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