Bitumen PG 76-28 is new technology of modifying bitumen by mix of SBS and use of PG grades help asphalt in summer time to have toughness and in winter time elasticity which the normal asphalt in summer time become soft and in wintertime hard cold weather make it crack.
Application of Bitumen PG 76-28
Bitumen PG 76-28 use for road construction in heavy traffic roads and airport asphalt layers.
Using SBS to modify bitumen has some effect on bitumen performance as:
Increase HMA stiffness at high service temperatures
Increase HMA elasticity at medium service temperatures to resist fatigue cracking
Decrease HMA stiffness at low temperatures to resist thermal cracking
Higher rigidity
Increased resistance to deformation
Increased resistance to cracks and stripping
Better water resistance properties
High durability
Bitumen PG 76-28 Specification
Kiapetro guarantees that the Bitumen PG 76-28 is produced in compliance and conformity to International of Standard ASTM D3381-09, also meets the requirements of the following specification.
| Test Parameter | Specification of PMB PG 76-28 |
|---|---|
| Average 7 Day maximum payment design temperature ,°C | <76 |
| Minimum pavment design temperature, °C | >28 |
| Properties of the Original Binder | |
| Cleveland Open Cup Plash Point, °C(AASHTO T 48) | >230 |
| Viscosity at 135° | <3.0 |
| Dynamic Shear, G*/sin & at 76°C AT 10 RAD/S,kPa(AASHTO T 315) | >1.0 |
| Properties of the Residual Binder from Rolling Thin Film Over Test | (AASHTO T240) |
| Mass change, % weight (AASHTO T240 | <1.0 |
| Dynamic Shear, G*/sin & at 76 °C at 10rad/s,kPa(AASHTO T315) | >2.2 |
| Properties of the Residual Binder from Pressure Aging Vessel (PAV) Test (AASHTO R29) | |
| Dynamic Shear,G*.sin & at 28°C at 10rad/s,kPa(AASHTO T315) | <5000 |
| Creep Stifness at -12°C(AASHTO T 313) S value, MPa m Value (Slope) |
<300 >0.30 |