What does PG stand for in relation to asphalt binders?

The term PG stands for Performance Grade in relation to asphalt binders. This nomenclature is part of a classification system that helps to denote the performance characteristics of the asphalt binder under different temperature and loading conditions. Performance Grade asphalt binders are designed and formulated to perform adequately under specific climatic conditions and traffic loads, which are essential considerations for ensuring the durability and longevity of asphalt pavement.

The PG system typically includes two numerical values: the first number represents the highest average seven-day maximum pavement temperature, while the second number indicates the lowest one-day minimum pavement temperature. This allows engineers and contractors to select the appropriate binder for specific environmental conditions, thereby enhancing the performance and lifespan of the asphalt surface.