Cutback bitumen is a mixture of bitumen and a suitable solvent (e.g. kerosene or gasoline). The type and quality of Cutback bitumen depends on the quality of the original pure bitumen, the type of solvent and the amount of solvent. This bitumen is liquid at room temperature or liquefied with a little heat.
Cutback bitumen is used in road construction for surface coatings, infiltration, cold factory asphalt or on-site mixes.
Cutback bitumen are divided into the following 3 groups according to the setting speed and the type of solvent:
– Rapid Curing Bitumen (RC):
Due to the high rate of evaporation of gasoline, the bitumen dissolved in gasoline hardens faster. This bitumen is called rapid curing bitumen.
– Medium Curing Bitumen (MC):
Bitumen dissolved in kerosene are called medium curing bitumen, which has a slower and longer evaporation rate than gasoline.
– Slow Curing Bitumen (SC):
Graves that are dissolved in gas oil or furnace oil are called slow curing bitumen.
Test |
Method |
Mc30 |
Mc70 |
Mc250 |
Mc3000 |
|---|---|---|---|---|---|
| Kinematic viscosity @60°c (cst) | ASTM D-2170 | 30-60 | 70-140 | 25-500 | 3000-6000 |
| Flash point °c (tag) | ASTM D-3143 | Min 38 | Min 38 | Min66 | Min66 |
| Water content% | ASTM D-95 | Max 0.2 | Max 0.2 | Max 0.2 | Max 0.2 |
| Distillation @190°c % | ASTM D402 | - | - | - | - |
| Distillation @225°c% | ASTM D-402 | 25max | 20max | 10max | - |
| Distillation @260°c% | ASTM D-402 | 40 -70 | 20-60 | 15-55 | 15 max |
| Distillation @316°c % | ASTM D-402 | 75-93 | 65-90 | 60-87 | 15-75 |
| Residue of Distillation @360% | ASTM D-402 | 50min | 55min | 67min | 80 min |
| Penetration @25°c.10/mm | ASTM D-5 | 120-250 | 120-250 | 120-250 | 120-250 |
| Solubility in TCE | ASTM D-2042 | 99.0min | 99.0min | 99.0min | 99.0min |
| Ductility @25°c 5cm/min | ASTM D-113 | 100max | 100max | 100max | 100max |
