bitumen(PG) is a type of bitumen asphalt which is designed by its performance at different temperatures.
There is an algorithm used to obtained the temperature of the pavement by the
air temperature. This algorithm which is given by long-term pavement
performance (LTPP) calculated the highest and lowest temperatures of pavement.
There is a specific method which help to choose the proper PG asphalt binder
for different climate and conditions. The grade of this bituminous asphalt
consist of two parts in notation, the first number is high pavement temperature
the second number is the low pavement temperature. The minimum pavement
temperature is used to prevent thermal cracking in cold weather condition. Performance
grade binder PG 70-22mean it can 7 days
meet maximum pavement temperature of 70°C and minimum pavement
temperature of -22°C so it can be used in very cold areas. This grade of
performance bitumen mostly used in pavement construction, pavement
rehabilitation, crack sealing, spray applications and pavement protective
membrane . It is mostly used in high traffic areas.