ASTM D4125/D4125M-21 PDF Download

The ASTM D4125/D4125M-21 standard provides procedures for determining the asphalt content of samples of uncompacted asphalt mixtures and laboratory compacted specimens using neutron thermalization techniques.

The test methods described in this standard are nondestructive and offer a rapid technique for determining asphalt content. They are suitable for quality control and acceptance testing in construction projects, as well as for research and development applications. However, it is important to note that these test methods do not provide extracted aggregate for gradation analysis.

The nondestructive nature of the test allows for repetitive measurements on a single test sample, enabling statistical analysis of the test data. The asphalt content of a material, expressed as a percentage, is determined by comparing the measured asphalt content with previously established calibration data. This standard also defines the calculation of asphalt content as the ratio of the mass of asphalt in a given mass of material to the total mass of the sample or the mass of the solid material particles.

It is worth mentioning that Method B, which pertains to laboratory compacted specimens, does not have a precision and bias statement developed in this standard. Therefore, it is not recommended for acceptance or rejection of materials for purchasing purposes.