Introduction
Cutback Bitumen SC-70 is a slow-curing (SC) bitumen utilized for road construction and maintenance. It is a general-purpose product manufactured through mixing of penetration-grade asphalt cement with a low-volatility petroleum solvent in the form of fuel oil or gas oil, which reduces its viscosity.
SC-70 becomes more workable at lower temperatures to make it easier to apply in most construction purposes. Characterized as a “road oil,” SC-70 is valued for its penetration into surfaces, adhesion to aggregates, and durable water resistance.
What is Cutback Bitumen SC-70?
Cutback Bitumen SC-70 is a slow-curing type of cutback asphalt and is characterized by the utilization of lower volatile solvents compared to rapid-curing (RC) or medium-curing (MC) types. The “SC” designation means slow curing, whereby the solvent vaporizes slowly and leaves the asphalt cement to function as a binder. “Quantity” “70” refers to its viscosity range, as measured in centistokes (cSt) at 60°C as per ASTM D2170 requirements. SC-70 contains 12–40% distillate content and is therefore liquid at ambient temperatures, and applicable to cold-applied purposes.
Key Applications
The “Key Applications” section presents the principal areas of application of Cutback Bitumen SC-70 for road construction and maintenance, its versatility due to the low viscosity and excellent bonding properties being its greatest strength. It is commonly used for prime coating, in which case it is applied to non-asphalt base courses to penetrate through and waterproof the surface such that the overlying layers of asphalt will stick better. Additionally, SC-70 is utilized in seal coats, where it dampen aggregate chips to create smooth, durable road surfaces.
It is also effective at creating patching mixes for patching deteriorated road sections and stockpile mixtures for future use. In addition, SC-70 is a dust control agent on unpaved roads, providing a cost-effective, all-weather surface. These uses identify SC-70 as well suited for cold-applied applications, especially in colder climates or where heating facilities are not present, and it becomes a logical option for many infrastructure applications.
Advantages of SC-70
Cutback Bitumen SC-70 enjoys the following benefits:
Ease of Application: Its reduced viscosity allows for cold application without the necessity for heating equipment.
Versatility: SC-70 works well over a range of applications, from priming to dust control, and is therefore a widely used material in roadworks.
Strong Adhesion: It contains adhesion agents that offer good adhesion to aggregate surfaces, enhancing pavement durability.
Cost-Effectiveness: As a road oil, SC-70 provides an economical means for maintenance of unpaved roads and paving base preparation.
Safety and Handling
The handling of SC-70 includes strict adherence to safety procedures due to the fact that it is flammable. Always read Safety Data Sheets (SDS) before use. Principal precautions are:
Store and transport at lowest possible temperature to minimize vapor emission.
Remove ignition sources while in use to prevent fires.
Wear adequate personal protective equipment (PPE), including heat-resistant gloves and safety glasses.
Don’t inhale vapors and don’t come in contact with skin.
Don’t allow SC-70 or its washings to go into storm drains or sewer systems to avoid environmental contamination.
SC-70 is usually stored in 200-liter epoxy-lined steel drums or transported in bulk tankers to protect from leaks in transit. Proper sealing and labeling are necessary to ensure product integrity and safety.
Environmental Considerations
Use of SC-70 Cutback Bitumen has slowed in some locations due to environmental regulations and due to distillate demand for fuel applications. Slow solvent evaporation can result in volatile organic compound (VOC) emissions, with stricter air quality standards. Alternative uses such as emulsified asphalt are increasingly being used, but SC-70 is still an effective product where the regulations permit.
Conclusion
Cutback Bitumen SC-70 is a dependable product for road construction, ensuring convenience, proper adhesion, and versatility. Its ability to perform in cold weather conditions and penetrate into surfaces makes it a must for priming, sealing, and dust control purposes. With proper care to safety and handling, contractors can take advantage of SC-70’s benefit to deliver strong, high-quality road surface. To learn more or order now, get in touch with reliable suppliers that ensure compliance with ASTM D2026 standards.
