| Specification Explanations / Original Binder | PG 46-34 | PG 46-28 | PG 52-28 | PG 58-28 | PG 58-22 | PG 64-22 | AASHTO Method |
|---|---|---|---|---|---|---|---|
| Flashpoint, COC,°C | 230 | T 48 | |||||
| Flash Point, P-M, °C | NS | ≥ 204 | ASTM D93 | ||||
| Rotational Viscosity @ 135°C, Pa.s | 3 | T 316 | |||||
| Dynamic Shear @ Grade Temperature,°C | 46 | 46 | 52 | 58 | 58 | 64 | T 315 |
| G*/sin @ 10 rad/sec, kPa | ≥ 1.00 | ||||||
| RTFOT Residue | |||||||
| Mass Loss, % | ≤ 1.00 | T 240 | |||||
| Dynamic Shear @ Grade Temperature,°C | 46 | 46 | 52 | 58 | 58 | 64 | T 315 |
| G*/sin @ 10 rad/sec, kPa | 2.2 | ||||||
| PAV Residue (Aging Temperature, °C) | 90 | 100 | R28 | ||||
| Dynamic Shear @ Grade Temperature,°C | 10 | 13 | 16 | 19 | 22 | 25 | T315 |
| G*/sin @ 10 rad/sec, kPa | 5000 | ||||||
| Creep Stiffness | -24 | -18 | -18 | -18 | -12 | -12 | |
| S, Mpa | ≤ 300 | T 313 | |||||
| m-value | ≥ 0.30 | T 313 |
Specification of Performance Grade(PG) Bitumen - Unmodified
Performance Grade (PG) Bitumen is bitumen that is graded based on its performance at different temperatures. In the Superpave grading system, binders are classified according to their performance in extremely high(hot), Medium, and low(cold) temperatures and called performance grade (PG) bitumen.
For example, the PG 58-28 means this grade can be used in an area where its maximum temperature is 58 and its lowest temperature is -28 degree Celsius.
It means that this bitumen cannot perform well in temperatures higher than 58 degrees Celsius and it cannot tolerate temperatures below -28 degrees Celsius.
The positive number which is 58 shows the average temperature of the seven successive days of the highest pavement temperature in the summer season. The negative number which is -28 indicates the lowest temperature of the pavement in the seven successive days of the winter season in degrees Celsius.
The PG bitumen is tested based on the different methods of the AASHTO standard. For PG bitumen, 3 parameters that are related to rutting, fatigue, and thermal cracking should be tested.
PG grades are mainly divided into Modified and Unmodified bitumen types.