At what temperature range does the PG grading system typically apply?

The PG (Performance Graded) grading system is designed to assess the performance of asphalt binders under different temperature conditions, which are critical for determining the material's suitability for various climate zones and traffic conditions. This system applies to both high and low temperatures to ensure that asphalt will perform adequately in diverse environmental conditions.

The PG grading system employs two key temperature points: the high performance grading temperature, which is relevant for evaluating how the binder behaves under elevated temperatures (like those experienced in hot weather), and the low performance grading temperature, which assesses performance in colder conditions. This dual consideration is vital since asphalt pavements are subjected to a wide range of temperatures throughout their service life, affecting their viscosity, flexibility, and overall durability.

By encompassing both extremes of temperature, the PG grading ensures comprehensive performance evaluation, making it essential for selecting the appropriate asphalt binder based on the specific environmental conditions where it will be used.