AASHTO R 67-20 PDF Download

AASHTO R 67-20 provides guidelines for obtaining core samples of compacted asphalt mixture from pavements for laboratory testing purposes. The standard specifies that the diameter of the cores can vary between 2 inches to 12 inches.

The purpose of sampling asphalt mixtures after compaction is to assess the quality and performance of the pavement materials. By taking core samples, engineers and technicians can analyze the properties of the asphalt mixture, such as density, stability, and void content, to ensure that it meets the required specifications and performance criteria.

The standard emphasizes the importance of following proper sampling procedures to avoid any damage or alteration to the core samples. This includes ensuring a clean and smooth cutting edge when extracting the cores from the pavement surface. Additionally, the standard provides recommendations for the frequency and location of core sampling, as well as instructions for preserving and transporting the samples to the laboratory for testing.