What is the purpose of the spot test on asphalt?

The purpose of the spot test on asphalt is to determine overheating during manufacturing. This test involves heating a small sample of asphalt and observing its behavior when subjected to heat. If the asphalt has been overheated during the production process, it may exhibit characteristics such as excessive brittleness or changes in viscosity that are indicative of degradation. Detecting this overheating is crucial as it can significantly affect the performance and longevity of asphalt in pavement applications.

While other tests and methods can evaluate different aspects of asphalt, such as its viscosity or flexibility, the spot test specifically targets the integrity of the material by checking for thermal degradation. This focus is important for ensuring that asphalt materials used in construction meet the necessary quality standards.