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- VG-30 (Viscosity Grade 30)
VG-30
Primary Use
- Ideal for pavement construction in areas with high traffic and moderate temperatures.
- Suitable for dense bituminous macadam (DBM), hot mix asphalt (HMA), and bituminous concrete (BC) layers.
Key Properties
- Higher viscosity than VG-10, providing greater resistance to deformation.
- Ensures durability and better load-bearing capacity for heavily trafficked roads.
Applications
- Construction of national highways, expressways, and city roads.
- Used in areas where pavement needs to withstand higher temperatures and heavy vehicular loads.
Specifications of VG-30 Bitumen According to IS: 73-2018
IS: 73-2018, issued by the Bureau of Indian Standards (BIS), provides the specifications for VG-30 bitumen, a commonly used grade for hot climates and roads with heavier traffic. Below are the key specifications for VG-30 Bitumen as per IS: 73-2018:
| Property | Requirement for VG-30 | Test Method |
|---|---|---|
|
Viscosity @ 60°C, Poise |
Min. 300 – Max. 600 |
IS 1206 (Part 2) |
|
Viscosity @ 135°C, cSt |
Min. 450 |
IS 1206 (Part 3) |
|
Penetration @ 25°C, 0.1 mm |
50 – 70 |
IS 1203 |
|
Softening Point, °C |
Min. 47 |
IS 1205 |
|
Ductility @ 25°C, cm |
Min. 75 |
IS 1208 |
|
Flash Point, °C |
Min. 230 |
IS 1448 (Part 20) |
|
Solubility in TCE, % |
Min. 99 |
IS 1216 |
Explanation of Key Properties for VG-30:
Viscosity at 60°C: This measures the thickness or resistance to flow of the bitumen. VG-30 must have a viscosity between 300 and 600 Poise at 60°C, making it suitable for hot climates and heavy traffic roads.
Viscosity at 135°C: This property is important for understanding the flow behavior of the bitumen during mixing. VG-30 must have a minimum viscosity of 450 cSt at 135°C, ensuring it remains workable at high temperatures during application.
Penetration: Penetration measures the hardness of the bitumen. For VG-30, the penetration at 25°C must range from 50 to 70 (0.1 mm), indicating it is stiffer than VG-10 but still workable under the required conditions.
Softening Point: The softening point is the temperature at which bitumen starts to soften. VG-30 should have a minimum softening point of 47°C, making it more resistant to softening under high temperatures compared to softer grades.
Ductility: Ductility refers to the ability of bitumen to stretch without breaking. VG-30 should have a minimum ductility of 75 cm at 25°C, ensuring flexibility and resistance to cracking under moderate temperatures.
Flash Point: The flash point indicates the safety level of bitumen when heated. VG-30 must have a minimum flash point of 230°C, ensuring its safe handling during storage and application in high-temperature environments.
Solubility in TCE: Solubility in Trichloroethylene (TCE) is an indicator of the purity of bitumen. VG-30 should have a minimum solubility of 99%, ensuring it is predominantly pure bitumen with minimal impurities.
Elastic Recovery and Residue Ductility: After distillation, VG-30 bitumen should exhibit 50% or more elastic recovery and a minimum of 25 cm ductility, ensuring it maintains flexibility and resilience even after aging.