Description
Viscosity Grade Bitumen VG-20 is a type of refinery bitumen obtained from vacuum aeration of distillation tower and divided according to their viscosity. The application of this type of bitumen is in road construction, insulation, construction and production of liquid bitumen.
In the classification based on the viscosity of bitumen according to the value of absolute viscosity at 60°C or kinematic viscosity at 135°C, the classification and direction of each of them have been determined by specific technical standards.
Absolute viscosity is expressed in poise and kinematic viscosity is expressed in centi-Stokes. Classification and characteristics of pure bitumen are reported in AASHTO-M226 and ASTM-D3381 standards.
Applications of Viscosity Grade Bitumen VG-20
The most common use of this type of bitumen is in road construction, insulation, building construction and liquid bitumen production. In terms of the place of use, VG20 bitumen is more suitable for slightly cold climates.
Specification of Viscosity Grade Bitumen VG-20
|
Characteristics |
VG-20 | Test |
|
Kinematic Viscosity, 135˚C, CST, min |
1600 | IS1206 |
| Flashpoint, C, Max | 300 |
IS1448 |
| Flashpoint, C, min | 220 |
IS1448 |
|
Solubility in trichloroethylene, %, min |
99.0 | IS1216 |
|
Penetration at 25˚C |
60-80 |
IS203 |
| Softening point, C, min | 45 |
IS1205 |
|
Tests on residue from thin film over test / RTFOT |
||
|
I. Viscosity ratio at 60˚C, max |
4.0 | IS1206 |
| II. Ductility at 25˚C, cm, min | 50 |
IS1208 |
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