General Description of Cutback Bitumen RC 70
Cutback Bitumen RC 70 is a type of bituminous material meticulously Used in road construction. The “RC” stands for “Rapid Curing,” indicating its fast-curing properties, while the “70” signifies its viscosity. RC-70 is classified as a rapid-curing cutback bitumen, and its relatively low viscosity makes it ideal for specific applications requiring quick setting times.
- RC: The “RC” in RC 70 stands for “Rapid Curing.” This indicates the curing properties of the cutback bitumen. Rapid-curing bitumens have a fast rate of solvent evaporation and curing, which means they solidify relatively quickly after application.
- 70: The number “70” represents the viscosity of the cutback bitumen. In this case, RC 70 has a relatively low viscosity, indicating that it is less viscous and flows more easily compared to cutback bitumens with higher viscosity numbers.
Cutback bitumen RC 70 is dissolved bitumen in the solvents of kerosene. In many countries, kerosene and other volatile petroleum-derived products are added as a cutter or cutback agent to bitumen to reduce (or Cutback) the viscosity of the bitumen.
The reduction in viscosity of the bitumen aids the construction of seal coats in road pavements as the softened mixture wets the chips more easily. The cutback agent evaporates from the seal coat, the cutback agent becoming a negligible component of the seal coat a few months after application. If significant amounts of the cutback agent remain in the seal coat an unwanted long-term softening effect may result.
Application of Cutback Bitumen RC 70
Cutback bitumen RC 70 is widely used in road construction and maintenance. Some common applications of cutback bitumen RC30 include:
- Prime Coat: RC 70 can be used as a bonding agent, promoting adhesion between the existing road surface and the new asphalt layer, and it helps to prevent moisture infiltration.
- Tack Coat: RC 70 can be used as a tack coat between the layers When constructing multiple layers of asphalt. It ensures a strong bond between the old and new asphalt layers, reducing the likelihood of delamination and improving the overall structural integrity of the road.
- Repair: RC 70 can be used In road maintenance and used for patching and repairing damaged or deteriorated sections of asphalt roads.
- Surface Treatment: RC 70 can be used in surface treatment applications. It is sprayed onto the road surface and then covered with a layer of aggregate or chips.
Properties of Bitumen RC 70
- Rapid Curing: RC-70 is classified as a rapid-curing cutback bitumen. This means it has a fast rate of solvent evaporation and curing, allowing it to solidify relatively quickly after application. This property is particularly beneficial for projects that require rapid completion or quick reopening of road sections.
- Higher Viscosity: RC-70 has a relatively higher viscosity compared to some other cutback bitumen grades. This viscosity ensures that the material flows smoothly but is not excessively thin, making it easier to handle and apply.
- Adhesive Qualities: RC-70 excels in enhancing the adhesion between asphalt layers. It promotes a strong bond between multiple asphalt courses, reducing the risk of delamination and ensuring the structural integrity of the road.
- Versatility: RC-70 is a versatile material that can be used in various climates and environmental conditions. Its adaptability makes it suitable for a wide range of road projects, from prime coating to surface treatments.
- Temperature Sensitivity: The curing process of RC-70 is sensitive to temperature. Warmer conditions accelerate solvent evaporation and curing, which can be advantageous when swift project completion is necessary.
Safety of Bitumen RC 70
Cutback Bitumen RC 70 is a hazardous material and should be handled with care. Some safety tips when using Bitumen RC 70 are:
- Protective Equipment: Always wear appropriate PPE when handling Cutback Bitumen RC 70, including gloves, safety goggles, and protective clothing.
- Ventilation: Ensure that there is adequate ventilation when using Cutback Bitumen RC 70, as the fumes can be hazardous.
- Handling and Transfer: Transport Bitumen RC 70 in approved containers and vehicles, following all safety regulations.
Packing of Cutback Bitumen RC 70
The Cutback Bitumen RC 30 is usually packed in bulk, Steel Drum, and IBC Tank but The packing type depends on the quantity of the product and the specific requirements of the customer.
- 1MT IBC Tank
- 200 Kg New Steel Drum- Palletized
- Bulk in Tuck Tanker
Specification of Cutback Bitumen RC 70
| Properties | Min | Max | Test Method |
|---|---|---|---|
| Kinematic viscosity at 60°c ,cST | 70 | 140 | ASTM D2170 |
| Flash point(tag open cup), °c | — | — | ASTM D3143 |
| to 437°f(225°c) | 50 | — | ASTM D402 |
| To 500°f(260°c) | 70 | — | ASTM D402 |
| to 600°f(316°c) | 85 | — | ASTM D402 |
| Residue from distillation to 680°f(360°c), percent volume by difference | 55 | — | ASTM D402 |
| Penetration 77°f(25°c) 100g,5s mm | 80 | 120 | ASTM D5 |
| Ductility 77°f(25°c) 5cm/min cm | 100 | — | ASTM D113 |
| Solubility in trichloroethylene % | 99 | — | ASTM D2042 |
| Water, percent volume | — | 0.2 | ASTM D95 |
