Performance Grade (PG) bitumen is bitumen
which is graded based on its performance at different temperatures. The
Long-Term Pavement Performance (LTPP) has given certain algorithm to calculate
the temperature of the pavement based on the temperature of the air above. From
this, the highest and the lowest temperatures of the pavement is calculated and
the bitumen that performs well in that temperature range is selected.
Performance Grade (PG) bitumen cement based on two factors: traffic and
pavement temperature. Adjustments are made to the PG grade of asphalt cement
based on traffic conditions and traffic volumes which are intended to enhance
the design life of the pavement