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ASTM D3142

This test method covers the determination of the density of cutback asphalts using a glass hydrometer. It is applicable to cutback asphalts which are liquid at room temperature. It provides more explicit testing procedures than those in method ASTM - D1298.

The determination is performed using a hydrometer.

The hydrometer floats in the sample.

The depth of immersion depends on the liquid density.

The scale provides a direct reading of density, relative density, or API gravity.

The measurement is carried out at a controlled temperature (typically 15°C or 60°F).

Applications for this method are i.e. quality control of cutback asphalt for road construction, product specification verification, custody transfer and trade control or process monitoring in asphalt production.

The method offers a simple method and is relatively inexpensive. It is suitable for quality control and direct reading is possible.

 

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    ASTM D3142 density apparatus
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General

ASTM D3142 is a standard test method for determining the density, relative density (specific gravity), or API gravity of cutback asphalts using a glass hydrometer. The method is intended for fluid asphalt materials that are sufficiently liquid at the test temperature to permit accurate hydrometer measurements. It is widely used for quality control, product identification, inventory calculations, and specification compliance in the asphalt industry.

Precision

ASTM D3142 includes repeatability (r) and reproducibility (R) values established through interlaboratory testing. The precision depends on proper temperature control, representative sampling, and the use of calibrated hydrometers. Careful handling of the sample is essential to obtain accurate and reproducible results.

Test

The method determines the density, relative density (specific gravity), or API gravity of cutback asphalt by measuring the buoyancy of a calibrated hydrometer immersed in the sample at a specified temperature.

Reported results:

  • Density
  • Relative density (specific gravity)
  • API gravity (as required)

Units:

  • Density: kilograms per cubic metre (kg/m³) or grams per cubic centimetre (g/cm³)
  • Relative density (specific gravity): Dimensionless (no unit)
  • API gravity: Degrees API (°API)

The measured values are used to characterize the physical properties of cutback asphalts and verify compliance with product specifications.