PG 70-22 Polymer Modified

Performance Grade (PG) bitumen PG 70-22 is a type of asphalt binder classified within the Superpave Performance Grading (PG) system, which ensures that bitumen can perform under specific temperature ranges. The numbers in the grade indicate the highest and lowest pavement temperatures at which the bitumen can provide optimal performance.

  • Appearance: Black solid or a viscous liquid
  • Standards: AASHTO M 320-16
  • HS Code: 27132000

Package: Bitumen are packed in

  • New Steel Drums of 200Kg / 180Kg / 156Kg / Customized
  • Jumbo Bags of 1Ton
  • Bulk Bitumen Tank Container

Is PG 70-22 Modified or Unmodified?

PG 70-22 is often polymer-modified, which enhances its ability to withstand high temperatures and prevents rutting. The modification provides elasticity, making the binder more resistant to temperature-related stress

Performance Grade PG 70-22 Polymer Modified – Technical Specifications

Properties Units Limits Test Methods
Average 7-day maximum pavement design temperature °C <70
Minimum pavement design temperaturea °C >22
Original Binder

Flash Point

 °C Min. 230 AASHTO T48

Viscosityb @135°C

 Pa.s Max. 3.0 AASHTO T316

Elastic Recovery

 % Min. 30 AASHTO T301

Dynamic Shearc , G*/sin δd at 70°C at 10rad/s

 kPa Min. 1.0 AASHTO T315
Residual Binder from Rolling Thin-Film Test (AASHTO T240 / ASTM D2872)

Mass changee

 %Wt Max. 1.0 AASHTO T240

Dynamic Shear, G*/sin δd at 70°C at 10rad/s

 kPa Min. 2.2 AASHTO T315
Pressure Aging Vessel Residue (PAV)

PAV Temperature

 °C 100 AASHTO R28

Dynamic Shear, G*.sin δd at 28°C at 10rad/s

 kPa Max. 5000 AASHTO T315

Creep Stiffnessf at -12°C

 AASHTO T313

    – S value

 Mpa Max. 300

    – M value (slope)

 Min. 0.30

Direct Tensionf at, -12°C

 AASHTO T314

    – Failure strain, test temp @ 1.0 mm/min

 % Min. 1.0

Notes
a – Pavement temperatures are estimated from air temperatures using an algorithm contained in the LTPP Bind program, may be provided by the specifying agency, or by following the procedures as outlined in M323 and R35.
b – This requirement may be waived at the discretion of the specifying agency if the supplier warrants that the asphalt binder can be adequately pumped and mixed at temperatures that meet all applicable safety standards.
c – For quality control of unmodified asphalt binder production, measurement of the viscosity of the original asphalt binder may be used to supplement dynamic shear measurements of G*/sinδ at test temperatures where the asphalt is a Newtonian fluid.
d – G*/sin? = high temperature stiffness and G* sinδ = intermediate temperature stiffness.
e – The mass change shall be less than 1.00 percent for either a positive (mass gain) or a negative (mass loss) change.
f – If the creep stiffness is below 300 MPa, the direct tension test is not required. If the creep stiffness is between 300 and 600 MPa, the direct tension failure strain requirement can be used in lieu of the creep stiffness requirement. The m-value requirement must be satisfied in both cases.

Main Applications Of Performance Grade PG 70-22 Polymer Modified Bitumen

  1. Highways and Major Roads: Used for high-traffic roads, expressways, and highways where durability is essential to prevent rutting and cracking.
  2. Bridges and Overpasses: Ideal for bridge decks and elevated roadways, where temperature extremes can lead to surface damage.
  3. Industrial Areas and Heavy-Duty Roads: Applied in industrial pavements and areas with heavy vehicle traffic, offering strength and longevity.
  4. Airport Runways: Suitable for airport runways and taxiways, providing stability under high loads and temperature fluctuations.
  5. Cold Climate Areas: Effective in regions with extreme winters and high summer temperatures, preventing cracking during freeze-thaw cycles.

PG 70-22 bitumen is highly versatile and used in applications such as highways, bridges, airports, and industrial areas. Its ability to resist both high-temperature rutting and low-temperature cracking ensures that it performs well in a variety of demanding environments.

Various Packing Method for PG 70-22 Polymer Modified Bitumen

Packing bitumen is an essential process to ensure its safe transportation, storage, and handling. The method of packing often depends on the type of bitumen, the transportation method, and the end-use. Here are the various methods used to pack bitumen:

Drum Packing

Bitumen is commonly packed in steel drums, which are robust and provide good protection during transportation.

Jumbo Packing

Bitumen is packed in high-density polyethylene (HDPE) bags and are lined with a plastic bag to prevent leakage.

Tank Container

These are large, insulated containers used for the international transport of bitumen.

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