In the realm of construction materials, oxidized bitumen plays a significant role, particularly in applications requiring durability, resilience, and adaptability. Among the various grades of oxidized bitumen, 115/15 stands out as a widely used and versatile material. This grade, characterized by its softening point of 115°C and penetration grade of 15, exhibits exceptional properties that make it suitable for a diverse range of applications. These characteristics make it particularly suitable for applications in hot climates and where high durability is required.
What is Oxidized Bitumen 115/15?
Oxidized Bitumen 115/15, or Blown Bitumen 115/15, is a semi-solid bitumen derived from blowing hot air into normal bitumen under controlled environments. This process hardens the bitumen and strengthens it against temperature changes. The result is a harder and more elastic material, making it a popular choice in waterproofing, roofing, and other industrial uses in severe environments.
Properties
Bitumen 115/15 derives its name from two significant specifications: a softening point around 115°C and penetration of 15 dmm (at 25°C). Both refer to high resistance to deformation under load and very good thermal stability, i.e., it does not flow in high temperatures. This oxidized bitumen grade is widely used in construction where long-term performance and durability of the works are needed. It has also good adhesion, waterproofing capability, and stability on melting, which makes it especially valuable in high-temperature or high-load conditions.
Manufacturing Process
Oxidized Bitumen 115/15 is manufactured by the following process: selection of good quality petroleum bitumen, generally made from vacuum distillation. The bitumen is melted to around 240–260°C and passed through an oxidation chamber in a stream of air. This “blowing” process chemically alters the molecular structure of the bitumen, enhancing its performance properties. After oxidation, the product is cooled, filtered, and blended with optional additives for enhanced performance. It is then packaged and stored in various forms such as drums, bags, or meltable blocks, according to application requirements.
Applications of Oxidized Bitumen 115/15
Oxidized Bitumen 115/15, due to its high softening point, low penetration value, and unique chemical stability, has widespread industrial and infrastructural applications. Its versatility makes it a core material in industries where endurance, heat resistance, and water tightness are crucial. The most prominent areas of application are as follows:
In roofing and waterproofing membranes, this bitumen grade is used in the production of roofing membranes, underlayment sheets, and sealants. It is used in flat roofs, terraces, and wet areas due to its resistance to thermal cycling without cracking, particularly in hot climates like the Middle East with high UV exposure.
In road construction and paving, although it is not used as a primary binder in flexible pavements, it plays a very significant role in expansion joints, bridge decks, and crack-sealing compounds. Its rigidity and heat tolerance resist deformation in areas that are exposed to constant vehicle loads and direct sunlight.
Pipe coating and corrosion protection industry also rely heavily on Oxidized Bitumen 115/15. As a coating for steel pipes, storage tanks, and structural steel with marine or industrial exposure, it is an excellent coating with its good adhesive properties, water, chemical, and temperature resistance.
This grade finds application in cable and electrical manufacturing as an insulation layer due to its dielectric properties. It is wrapped around power cables, especially high-voltage cables and transformers, to enhance safety and prevent the ingress of moisture.
In prefabricated building material, blown bitumen is utilized as a bonding and water-proofing material in panels, expansion joint fillers, and sound-proofing layers. Its resistance to environmental exposure and mechanical stress increases the life of such members.
Further, in the mechanical and chemical industries, Oxidized Bitumen 115/15 is used as raw material in producing adhesives, mastics, joint fillers, and industrial sealants. Since it is compatible with polymers, it can be blended into special formulations for extremely specific applications such as pressure-resistant gaskets or high-temperature insulation.
The versatility of this material in both hot and cold application techniques further extends its application. It can be applied by heating and pouring, by torch-on techniques, or as part of compound products that are cold-applied using solvents or additives.
Advantages and Limitations
Its most important advantages include the fact that it has high softening point, low penetration value, and excellent weathering, UV, and chemical resistance. This lends it an excellent durability and is ideal for long-term projects. The production is high energy demanding and VOC emitting, thus representing an environmental drawback. It also costs more compared to conventional bitumen, although the reduced maintenance cost and long lifespan may cover the extra expenditure in most applications.
Performance and Quality Control
For reliability and consistency, Oxidized Bitumen 115/15 undergoes strict quality control. Performance properties such as penetration, softening point, flash point, and viscosity are tested according to ASTM specifications. Visual inspection and chemical composition analysis are also among the routine checks for the detection of impurities and determining conformity to safety and technical specifications.
Safety Guidelines
Due to the release of fumes upon exposure to high heat, proper ventilation is critical in the handling of oxidized bitumen. Workers are required to wear protective clothing, gloves, and goggles. Buildings should be equipped with fire-fighting equipment, and exposure to open flames should be prevented while heating or applying it.
Packaging and Container Capacity
Blown Bitumen 115/15 is typically packaged in 25kg quantities in meltable polyamide bags, carton boxes, kraft bags, blocks, or metal drums. A 20-foot container can carry approximately 22 to 23 tons depending on the packing type. Each of these packagings is compatible with specific transportation, melting, and handling conditions, which makes it easy for contractors and suppliers.
Specification of Oxidized Bitumen
The oxidized asphalt grade 115/15 means the softening point is 115°c and penetration is 15 desi millimeters is produced in compliance and conformity to ASTM standards and meets the following specifications:
| Bitumen 115/15 | Test method | Unit | Specification |
|---|---|---|---|
| Specific gravity @25/25 C | ASTM D70 | (Kg/m3) | 1.05 approx. |
| Penetration @ 25°c | ASTM D5 | mm/10 | 10/20 |
| Softening point °c | ASTM D36 | °C | 110/120 |
| Ductility @25 °c | ASTM D113 | Cm | 1.5min |
| Loss on heating(wt) % | ASTM D6 | Wt. % | 0.2 max |
| Flashpoint c | ASTM D92 | °C | 250 min |
| Solubility is CS2(wt) % | ASTM D4 | Wt. % | 99.5 max |
| Spot test | A.A.S.H.O.T102 | — | Negative |
If you are more interested in product information or need to place an order contact or inquire about our Sales team.
