ASTM D3142
Full Name
ASTM D3142 – Standard Test Method for Specific Gravity, API Gravity, or Density of Cutback Asphalts by Hydrometer Method
Scope
ASTM D3142 provides a standardized method for determining the density, specific gravity, or API gravity of cutback asphalts using a glass hydrometer.
Cutback asphalts are asphalt binders that have been liquefied by adding petroleum solvents. This liquefaction makes them easier to handle and apply, especially in cold weather conditions or for specific construction techniques.
ASTM D3142 outlines a procedure for accurately measuring the density of these cutback asphalts. This information is essential for several reasons:
- Volume to weight conversion: density allows for the conversion of measured volumes to weight, which is crucial for material proportioning and cost estimation.
- Consistency and quality control: monitoring density helps ensure the uniformity and quality of cutback asphalt from different batches or suppliers.
- Performance prediction: density can be an indicator of other asphalt properties, such as viscosity and binder content, which ultimately influence pavement performance.
The ASTM D3142 test method involves the following steps:
- Temperature control: the cutback asphalt sample is brought to a specific temperature within a controlled environment to minimize variations during testing.
- Hydrometer immersion: a calibrated glass hydrometer is carefully lowered into the temperature-controlled sample and allowed to settle.
- Reading and correction: the hydrometer scale reading is recorded, and corrections are applied to account for factors like meniscus effects and temperature variations.
- Density calculation: using established tables and formulas, the corrected hydrometer reading is used to calculate the density of the cutback asphalt at the standard reference temperature (15°C or 60°F).
ASTM D3142 also allows for the determination of specific gravity and API gravity, which are related to density:
- Specific gravity: this is the ratio of the density of the cutback asphalt to the density of water at a specified temperature.
- API gravity: primarily used for petroleum products, API gravity is an inverse measure of density, with lighter liquids having higher API values.
ASTM D3142 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM D3142 standard.
Contact us today to discuss your testing needs and ensure the quality and performance of your asphalt materials..
Resources
Keywords
specific gravity; api gravity; density; hydrometer; cutback asphalt; relative density; test method; laboratory determination; glass hydrometer; liquid asphalt