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
4. Summary of Test Method
4.1 The sample is brought to the testing temperature and transferred to a hydrometer cylinder at approximately the same temperature. The cylinder and its contents are placed in a constant-temperature bath to avoid excessive temperature variation during the test. The appropriate hydrometer is lowered into the sample and allowed to settle. After temperature equilibrium, the hydrometer is read and the temperature of the sample is noted.
4.2 The hydrometer reading is corrected to either 15°C or 60°F by referring to standard tables.
5. Significance and Use
5.1 Accurate determination of the density, specific gravity, or API gravity of cutback asphalts is necessary for the conversion of measured volumes to volumes at the standard temperature of 15°C or 60°F.
5.2 Similarly, accurate determination is necessary for converting volumes to mass as required in other ASTM tests on cutback asphalts.
5.3 Values corrected to 15°C and 60°F will be different because the two temperatures are not equal.
