AASHTO T 355-18 PDF Download

AASHTO T 355-18 is a standard method of test that outlines the procedure for determining the in-place density of asphalt mixtures using nuclear methods. The test utilizes a nuclear gauge, which measures the density of the material through the backscatter/air-gap ratio method.

The density of the asphalt mixture is determined by measuring the attenuation of gamma radiation, with both the source and detector(s) located on the surface (backscatter method). This method allows for non-destructive testing and provides a practical way to assess the density of the material.

By comparing the detected rate of gamma radiation with previously established calibration data, the density in mass per unit volume of the asphalt mixture under test can be determined. This standard provides a consistent and reliable method for measuring the in-place density of asphalt mixtures, ensuring accurate and consistent results for quality control and assurance purposes.