General information of cutback bitumen MC-250
Cutback bitumen MC-250 is a medium-curing (MC) cut-back asphalt. It consists of penetration-grade asphalt cement combined with a diluent or cutter of medium volatility. The diluent temporarily reduces the viscosity of the asphalt, making it easier to handle and apply. Once the application occurs, the diluent evaporates, leaving behind the asphalt cement to perform its intended function. This reduction in viscosity makes MC-250 bitumen ideal for various applications, as its viscosity falls between 250 and 500 CST.
ATDM manufactures cutback bitumen by dissolving the bitumen in solvents like kerosene. This helps reduce the viscosity and allows for easier handling. Many manufacturers across the world use kerosene and other petroleum-derived products to lower the viscosity of bitumen. This process is especially useful in the construction of road pavements, as the reduced viscosity allows the mixture to wet the chips more easily. The cutback agent evaporates after application, becoming negligible in the seal coat a few months later. However, if excessive amounts of the cutback agent remain, it may cause unwanted long-term softening.
About cutback bitumen MC-250
ATDM’s MC-250 cutback bitumen meets the standards for medium-curing petroleum asphalts, as outlined in ASTM D2028-97 (reapproved in 2004). The product fits a wide range of construction and treatment applications, particularly for pavements.
ATDM produces this cutback bitumen by blending penetration-grade bitumen with a solvent like kerosene, white spirit, gasoline, or naphtha. These solvents control the curing time, making it easier to apply the bitumen to surfaces, Additionally, ATDM ensures that the bitumen undergoes a vacuum distillation process to meet high industry standards.
So Penetration-grade bitumen, including MC-250, is categorized by its penetration and softening points, These grades exhibit thermoplastic properties, which means the material softens at higher temperatures and hardens at lower temperatures. These properties make MC-250 versatile for a wide range of uses.
Why choose low-viscosity bitumen MC-250?
The reduction in viscosity provided by MC-250 bitumen is critical for road pavement construction. The softened mixture wets the chips more easily, enhancing the adhesion between materials. After application, the cutback agent evaporates, and its effect diminishes over time, However, if too much cutback agent remains in the seal coat, it may cause unwanted softening, which can impact the seal coat’s performance and longevity.
How to choose the right cutback bitumen
Choosing the right cutback bitumen depends largely on the ambient temperature, In warmer climates, it is best to use a medium-curing asphalt with higher viscosity, such as MC800 or MC3000. In contrast, colder climates require a medium-curing asphalt with lower viscosity, such as MC250 or MC70.
Packaging of cutback bitumen MC-250
ATDM supplies cutback bitumen MC-250 in bulk via tanker or in new steel drums. To prevent leakage, the drums are securely packed on thick plastic-wrapped pallets, ensuring safe transport and handling.
Uses of cutback bitumen MC-250
Cutback agents like MC-250 are essential for reducing the viscosity of bitumen when it’s applied as a primer to road pavements or aggregate bases, Kerosene is commonly used as a cutback agent, and its concentration varies depending on local conditions and specific requirements.
MC-250 is particularly suitable for prime coats and cold applications. It eliminates the need for thinning or heating, which simplifies its use. Moreover, it is effective for damp-proof courses, especially for small repairs or extensions added to existing structures. Cutback bitumen is also used in producing patching mixtures or stockpile mixtures, Typically, an adhesion agent is added to improve the coating of aggregates.
Safety of cutback bitumen MC-250
Before use, always refer to the Safety Data Sheets (SDS) for the appropriate safety guidelines. During transport, use, and storage, keep the temperature as low as possible. Additionally, ensure there are no potential ignition sources during application. It’s important to avoid inhaling vapors and prevent skin contact. When working with hot bitumen, always wear proper personal protective equipment (PPE), including heat protection. Finally, make sure the product or any washings do not enter stormwater or sewer systems.
Analysis of cutback bitumen MC-250
Here are the specifications for MC-250 cutback bitumen:
– Kinematic viscosity at 60°C: 250-500 cST (ASTM D2170)
– Flashpoint (tag open cup): ≥ 66°C (ASTM D3143)
– Distillation test (ASTM D402):
– Distillate to 680°F (360°C): 20% max
– To 437°F (225°C): 5% min
– To 500°F (260°C): 55% min
– To 600°F (316°C): 60% min
– Residue: 67% min
– Test on residue from distillation (ASTM D2170):
– Viscosity at 140°F (60°C): 30-120
– Penetration at 77°F (25°C) with 100g for 5 seconds: 120-300 mm (ASTM D5)
– Ductility at 77°F (25°C) with 5cm/min: 100 cm min (ASTM D113)
– Solubility in trichloroethylene: 99% min (ASTM D2042)
– Water content: 0.2% max (ASTM D95)
ATDM’s MC-250 cutback bitumen combines low viscosity with high workability and durability. It meets all necessary industry standards, ensuring reliable performance in a wide range of applications. By choosing ATDM’s MC-250 cutback bitumen, customers can ensure the success of their projects, whether they involve road construction, patching, or waterproofing.,
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