+98 21 88190963 [email protected]

Viscosity Grade Bitumen

 

Viscosity Grade Bitumen (Asphalt) is a standard grade Bitumen usually used as a Paving Grade Bitumen suitable for road construction and for the production of asphalt pavements with superior properties. This grade of Bitumen is mainly used in the manufacture of hot mix asphalt for bases and wearing courses.

Viscosity grade bitumens have a thermoplastic property which causes the material to soften at high temperatures and to harden at lower temperatures. This unique temperature/ viscosity relationship is important when determining the performance parameters such as the adhesion, rheology, durability and application temperatures of bitumen.

There are two methods of grading:

  • Standard Viscosity Grade Bitumen (AC-Grades), in which the Viscosity of the standard bitumen (asphalt) is measured at 60 ºC (140 ºF).
  • RTFOT Viscosity Grade Bitumen (AR-Grades), in which the Viscosity of bitumen (asphalt) is measured at 60 °C (140 °F) after the roll on thin film oven test.

 

 

With AC grading, the asphalt binder is characterized by the properties it possesses before it undergoes the HMA manufacturing process. The AR grading system is an attempt to simulate asphalt binder properties after it undergoes a typical HMA manufacturing process and thus, it should be more representative of how asphalt binder behaves in HMA pavements.

Advantages and Disadvantages of Viscosity Grading

Advantages

Unlike penetration depth, viscosity is a fundamental engineering parameter.
Test temperatures correlate well with:

25° C (77° F) – average pavement temp.

60° C (140° F) – high pavement temp.

135° C (275° F) – HMA mixing temp.

 

Temperature susceptibility (the change in asphalt binder rheology with temperature) can be somewhat determined because viscosity is measured at three different temperatures (penetration only is measured at 25° C (77° F)).
Testing equipment and standards are widely available.

Disadvantages

The principal grading (done at 25° C (77° F)) may not accurately reflect low-temperature asphalt binder rheology.
When using the AC grading system, thin film oven test residue viscosities can vary greatly with the same AC grade. Therefore, although asphalt binders are of the same AC grade they may behave differently after construction.
The testing is more expensive and takes longer than the penetration test

Ziggurat oil supplies Viscosity Graded Bitumen in correspondence to ASTM D3381 and AASHTO-M226. Also we provide Viscosity grade bitumen based on IS 73:2013 too.

Standard Viscosity Grade Bitumen Binders

Standard Viscosity Grade Bitumen Binders include:

 

  • Viscosity Grade Bitumen AC-2.5
  • Viscosity Grade Bitumen AC-5
  • Viscosity Grade Bitumen AC-10
  • Viscosity Grade Bitumen AC-20
  • Viscosity Grade Bitumen AC-30
  • Viscosity Grade Bitumen AC-40

Specification (Pure Bitumen Based on Viscosity at 60 °C (AASHTO-M226)

Property Units AC-2.5 AC-5 AC-10 AC-20 AC-30 AC-40 Test Methods
Viscosity, 140°F (60°C) P 250±50 500±100 1000±200 2000±400 3000±600 4000±800 ASTM D-2171
Viscosity, 275°F (135°C), Min cSt 80 110 150 210 250 300 ASTM D-2171
Penetration, 77°F (25°C), 100g, 5sec, Min 0.1MM 200 120 70 40 30 20 ASTM D-5
Flash point, Cleveland open cup, Min °C 163 177 219 232 232 232 ASTM D-92
Solubility in trichloroethylene, Min %Wt 99 99 99 99 99 99 ASTM D-2042
Test on the residue of thin bitumen layer
Viscosity, 140°F (60°C), Max P 1000 2000 4000 8000 16000 20,000 ASTM D-2171
– Ductility, 77°F (25°C), 5cm/min, Min CM 100 100 50 20 15 10 ASTM D-113

 

Specification (Pure Bitumen Based on Viscosity at 60 °C (AASHTO-M226)

 Specifications of Pure Bitumen Based on Viscosity

RTFOT Viscosity Grade Bitumen Binders

RTFOT Viscosity Grade Bitumen Binders include:

  • Viscosity Grade Bitumen AR-1000
  • Viscosity Grade Bitumen AR-2000
  • Viscosity Grade Bitumen AR-4000
  • Viscosity Grade Bitumen AR-8000
  • Viscosity Grade Bitumen AR-16000

Specification (Pure Bitumen Based on Viscosity at 60 °C (AASHTO-M226))

Test on the residue of thin bitumen layer Viscosity
Units 1000AR- 2000AR- 4000AR- 8000AR- 16000AR- Test Methods
Viscosity at 60 °C P 250 ±1000 500±2000 1000 ±4000 2000±8000 4000 ±16000 ASTM D-2171
Viscosity at 135 °C                cSt 140 200 275 400 550 ASTM D-2171
Penetration at 25 °C, 100 grams, five seconds 0.1MM 65 40 25 20 20 ASTM D-5
Penetration at 25 C, 100 grams, five seconds. minimum 0.1MM  – 40 45 50 52 ASTM D-5
Ductility at 25 C, 5cm/min CM 100 100 75 75 75 ASTM D-113
Test on residue  
Flash point, Cleveland open cup °C 205 219 227 232 238 ASTM D-92
Solubility in  trichloroethylene 0/99 0/99 0/99 0/99 0/99 ASTM D-2042

 

Specification (Pure Bitumen Based on Viscosity at 60 °C (AASHTO-M226))

Specifications of Pure Bitumen Based on Viscosity

Viscosity Grade Bitumen Binders based on IS 73:2013

Viscosity Grade Bitumen Binders based on IS 73:2013 include:

  • VG-10: VG-10 is widely used in spraying applications such as surface-dressing and paving in very cold climate in lieu of old 80/100 Penetration grade. It is also used to manufacture Bitumen Emulsion and Modified Bitumen products.
  • VG-20: VG-20 is used for paving in cold climate & high altitude regions
  • VG-30: VG-30 is primarily used to construct extra heavy duty Bitumen pavements that need to endure substantial traffic loads. It can be used in lieu of 60/70 Penetration grade.
  • VG-40: VG-40 is used in highly stressed areas such as intersections, near toll booths and truck parking lots in lieu of old 30/40 Penetration grade. Due to its higher viscosity, stiffer Bitumen mixes can be produced to improve resistance to shoving and other problems associated with higher temperature and heavy traffic loads.

Specification (Pure Bitumen Based IS 73:2013)

Property Units VG-10 VG-20 VG-30 VG-40 Test Methods
Penetration at 25°C, 100g, 5sec, Min 0.1MM 80 60 45 35 IS 1203
Absolute viscosity at 60°C P 800-1200 1600-2400 2400-3600 3200-4800 IS 1206 (Part 2)
Kinematic viscosity at 135°C, Min cSt 250 300 350 400 IS 1206 (Part 3)
Flash point (Cleveland open cup), Min °C 220 220 220 220 IS 1448 [P : 69]
Solubility in trichloroethylene, Min %Wt 99 99 99 99 IS 1216
Softening point (R&B), Min °C 40 45 47 50 IS 1205
Tests on residue from thin film oven test
– Viscosity ratio at 60°C, Max 4 4 4 4 IS 1206 (Part 2)
– Ductility at 25°C, Min CM 75 50 40 25 IS 1208

 

Specification (Pure Bitumen Based IS 73:2013)

Specifications of Pure Bitumen