What is the temperature threshold for high temperature testing of PG binders?

The temperature threshold for high temperature testing of PG (Performance Grade) binders is commonly set at 67°C. This temperature is significant because it represents the point at which the binder must perform effectively under high-temperature conditions typical of warm climates or heavy traffic situations. At this temperature, the binders are assessed for properties such as flow, rutting resistance, and elasticity.

Understanding this temperature is crucial for ensuring that the asphalt binder will maintain its performance characteristics during hot weather conditions, as excessive softening can lead to deformation and failure in the pavement. The selection of appropriate temperatures is a part of the binder grading system, which helps ensure that the asphalt used in paving projects can withstand the environmental and traffic conditions it will encounter.

In the context of this question, the other temperatures provided are not reflective of the established threshold for high-temperature testing in the PG grading system. Therefore, 67°C is the correct and critical threshold for conducting meaningful assessments of a PG binder's high-temperature performance.