What is the "Static Cone Penetration Test" used for in asphalt analysis?

The Static Cone Penetration Test (CPT) is specifically designed to evaluate the mechanical properties of subgrade materials, making it particularly relevant for understanding the soil's strength and stability beneath asphalt layers. In this test, a cone is driven into the ground at a constant rate, and the resistance encountered as it penetrates provides valuable data on the soil’s characteristics. This information is critical for determining bearing capacity and assessing whether the subgrade can adequately support the pavement structure.

While other options pertain to various aspects of asphalt and surface analysis, they do not directly relate to the primary purpose of the CPT, which focuses on subgrade material assessment. For instance, assessing surface textures involves different methodologies suited for understanding the top layer of asphalt, while measuring asphalt temperature and determining its viscosity require specific tests tailored to the properties of the asphalt itself rather than the subgrade.