The laboratory determined equi-viscous temperatures should be used how?

The concept of equi-viscous temperatures is integral in ensuring optimal performance of Hot Mix Asphalt (HMA) in the field. These temperatures, determined in a laboratory setting, serve as a guideline for achieving the desired viscosity of asphalt binder during mixing and compaction. While they provide a valuable reference point, they are not absolute or unchangeable.

Using equi-viscous temperatures as a starting point acknowledges the practical realities in the field, which may differ from controlled laboratory conditions. Factors such as ambient temperature, humidity, and specific characteristics of the aggregate and binder used can influence the performance of the asphalt in real-world applications. Therefore, it's crucial for inspectors and contractors to be prepared to adjust these temperatures based on field conditions to achieve the best results.

This approach allows for flexibility and adaptability in the application of asphalt, leading to improved durability and performance of the pavement. Thus, treating equi-viscous temperatures as a preliminary guideline that may need modification based on real-time observations and conditions is fundamentally sound and supports better quality control in HMA paving operations.