Slow Curing Cutback
WHAT IS SLOW CURING CUTBACK BITUMEN?
Slow curing Cutback Bitumen and oils of low volatility are generally in the heavy distillate range (SC-70, 250, 800, 3000). The degree of liquidity developed in each case depends principally on the proportion of solvent to asphalt cement. To a minor degree, the liquidity of the cutback may be affected by the hardness of the base asphalt from which the cutback is made. The degree of fluidity results in several grades of cutback asphalt—some quite fluid at ordinary temperatures and others somewhat more viscous. The more viscous grades may require a small amount of heating to make them fluid enough for construction operations. Slow Curing often called “road oils,” are usually a residual material produced from the fractional distillation of certain crude petroleums. Traditionally any kind of aromatic, naphthenic, and paraffinic oils are used. Slow Curing liquid bitumen materials can be prepared by blending bitumen with an oily petroleum fraction.
SLOW CURING CUTBACK BITUMEN APPLICATIONS
Current common uses are in penetrating prime coats and in producing patching or stockpile mixtures. Cutback asphalt used in mixing with aggregate will usually contain an adhesion agent to assist in the coating of the aggregate surface. Cutback agents are used to lower the viscosity of bitumen when it is applied as a primer to the surface of a road pavement aggregate base course or substrate. Kerosene is used as a bitumen cutback agent at different concentrations according to local conditions and requirements. The cutback bitumen is ideal for prime coat and cold applied because of easy uses and no need for thinning and heating. Cutback bitumen SC consists of initial incorporation of asphalt into the surface of non-asphalt-based course preparatory to any superimposed treatment of construction. The cutback asphalt Slow curing Cutback applying to waterproofing of surfaces plugging capillary voids, coat, and bond loose mineral particles.
- Road Construction: Slow curing cutback bitumen is often used in road construction for surface treatments, prime coats, and tack coats. The slow-evaporating solvent allows for a longer curing time, ensuring better penetration and adhesion to the road surface.
- Prime Coating: It is applied as a prime coat to prepare the base surface before the application of asphalt layers. The slow-curing properties help in achieving better penetration into the existing road surface, enhancing the bond between layers.
- Tack Coat: Slow curing cutback bitumen serves as a tack coat, promoting adhesion between asphalt layers during pavement construction. The extended curing time allows for optimal bonding between layers.
- Surface Dressing: It can be used in surface dressing applications, providing a weather-resistant and durable surface for roads.
- Dust Control: In areas where dust control is necessary, slow curing cutback bitumen can be applied to gravel or dirt roads. The slow evaporation of the solvent allows for better penetration and binding of surface particles, reducing dust emissions.
- Patchwork and Repair: Slow curing cutback bitumen is suitable for patching and repairing damaged road sections. The longer curing time ensures effective sealing of repaired areas.
- Temporary Pavements: It can be used in the construction of temporary pavements for events or construction sites where a slower curing process is preferred.
- Parking Lots: Slow curing cutback bitumen is employed in the construction of parking lots, providing a stable and durable surface.
- Emulsion Production: Slow curing cutback bitumen can also be used in the production of bitumen emulsions, which are widely used in various road maintenance and construction applications.
It’s essential to follow industry standards and guidelines when using slow curing cutback bitumen to ensure proper application and performance. The choice of cutback bitumen grade may vary based on specific project requirements and environmental conditions. Manufacturers and suppliers typically provide technical specifications and recommendations for their products.
TECHNICAL DATA SHEET OF SC-70
| Property | Min | Max | Test Method |
|---|---|---|---|
| Kinematic viscosity at 60°C [140°F], mm2/s | 70 | 140 | ASTM D2170 |
| Flashpoint(Cleveland open cup), °C [°F] | 60 | — | ASTM D3143 |
| Distillate Test | |||
| Total distillate to 360°C [680°F], volume % | - | 35 | ASTM D402 |
| Solubility, % | 95 | - | ASTM D2024 |
| Kinematic viscosity on distillation residue at 60°C [140°F], mm2/s | 200 | 7000 | ASTM D2170 |
| Asphalt Residue | |||
| Residue of 100 penetration, % | 40 | - | ASTM D243 |
| Ductility of 100 penetration residue at 25°C [77°F], cm | 50 | - | ASTM D113 |
| Water, % | - | 0.5 | ASTM D95 |
TECHNICAL DATA SHEET OF SC-250
| Property | Min | Max | Test Method |
|---|---|---|---|
| Kinematic viscosity at 60°C [140°F], mm2/s | 250 | 500 | ASTM D2170 |
| Flashpoint(Cleveland open cup), °C [°F] | 60 | — | ASTM D3143 |
| Distillate Test | |||
| Total distillate to 360°C [680°F], volume % | - | 25 | ASTM D402 |
| Solubility, % | 95 | - | ASTM D2024 |
| Kinematic viscosity on distillation residue at 60°C [140°F], mm2/s | 400 | 10000 | ASTM D2170 |
| Asphalt Residue | |||
| Residue of 100 penetration, % | 50 | - | ASTM D243 |
| Ductility of 100 penetration residue at 25°C [77°F], cm | 50 | - | ASTM D113 |
| Water, % | - | 0.5 | ASTM D95 |
TECHNICAL DATA SHEET OF SC-800
| Property | Min | Max | Test Method |
|---|---|---|---|
| Kinematic viscosity at 60°C [140°F], mm2/s | 800 | 1600 | ASTM D2170 |
| Flashpoint(Cleveland open cup), °C [°F] | 70 | — | ASTM D3143 |
| Distillate Test | |||
| Total distillate to 360°C [680°F], volume % | - | 15 | ASTM D402 |
| Solubility, % | 95 | - | ASTM D2024 |
| Kinematic viscosity on distillation residue at 60°C [140°F], mm2/s | 1000 | 16000 | ASTM D2170 |
| Asphalt Residue | |||
| Residue of 100 penetration, % | 60 | - | ASTM D243 |
| Ductility of 100 penetration residue at 25°C [77°F], cm | 50 | - | ASTM D113 |
| Water, % | - | 0.5 | ASTM D95 |
TECHNICAL DATA SHEET OF SC-3000
| Property | Min | Max | Test Method |
|---|---|---|---|
| Kinematic viscosity at 60°C [140°F], mm2/s | 3000 | 6000 | ASTM D2170 |
| Flashpoint(Cleveland open cup), °C [°F] | 70 | — | ASTM D3143 |
| Distillate Test | |||
| Total distillate to 360°C [680°F], volume % | - | 8 | ASTM D402 |
| Solubility, % | 95 | - | ASTM D2024 |
| Kinematic viscosity on distillation residue at 60°C [140°F], mm2/s | 2000 | 35000 | ASTM D2170 |
| Asphalt Residue | |||
| Residue of 100 penetration, % | 75 | - | ASTM D243 |
| Ductility of 100 penetration residue at 25°C [77°F], cm | 50 | - | ASTM D113 |
| Water, % | - | 0.5 | ASTM D95 |
