AASHTO M 20-70 (2004) PDF Download

The AASHTO M 20-70 (2004) standard specifies the requirements for five different penetration grades of asphalt binder used in highway construction. These grades range from 40 to 50, 60 to 70, 85 to 100, 120 to 150, and 200 to 300. This standard does not cover asphalt binders graded by viscosity, which are covered under AASHTO M 226.

The purpose of this standard is to provide guidelines and specifications for the consistency and performance of penetration-graded asphalt cement. This allows for uniformity in the selection and use of asphalt binder in highway construction projects. The specified grades help in determining the suitable asphalt binder for different applications and climates.

Penetration-graded asphalt binder is classified based on the penetration test, which measures the hardness and consistency of the material. The higher the penetration grade, the softer the asphalt binder. This specification ensures that the asphalt binder meets the required properties such as penetration, ductility, flash point, and other performance characteristics.