ASTM D3142 for Specific Gravity, API Gravity, or Density of Cutback Asphalts
ASTM D3142 Standard Test Method for Specific Gravity, API Gravity, or Density of Cutback Asphalts by Hydrometer Method
12. Report
12.1 Report the final value as specific gravity 60/60°F, or density at 15°C, kg/m3, or as gravity in degrees API, as applicable.
13. Precision and Bias
13.1 Single Operator Precision - The single-operator standard deviation for the specific gravity of cutback asphalts has been found to be 0.00195. Therefore, results of two properly conducted tests by the same operator on the same material should not differ by more than 0.0055 for specific gravity 60/60°F, 5.5 kg/m3 for density at 15°C, or 1.1 for API gravity at 60°F.
13.2 Multilaboratory Precision - The multilaboratory standard deviation for the specific gravity of cutback asphalts has been found to be 0.00276. Therefore, results of two properly conducted tests by two laboratories on samples of the same material should not differ by more than 0.0078 for specific gravity 60/60°F, 7.8 kg/m3 for density at 15°C, or 1.1 for API gravity at 60°F.
NOTE 6 - These numbers represent the 1S and D2S limits as described in Practice C670.
13.3 Bias - No information can be presented on the bias of the procedure in Test Method D3142 for measuring Specific Gravity, API Gravity, or Density of Cutback Asphalts by the Hydrometer Method because no material having an acceptable reference value is available.
14. Keywords
14.1 API gravity; cutback asphalt; density; relative density; specific gravity
