Oxidized bitumen 75/25, also known as blown asphalt 75/25, is an asphalt containing pure petroleum-based bitumen. As with other oxidized bitumen grades, this product is made by air-blowing through asphalt flux. A grade of this material can be used in a variety of construction applications due to its special physical properties.
In a controlled environment, heated Penetration Grade bitumen is blown with air, which controls the oil content while it oxidizes. To specify the mid-point of the softening point and penetration ranges, the grades for suitable applications are referred to by two numbers.
Polymer modified bitumen 75/25
The vast majority of traffic and climatic conditions encountered result in the use of conventional bitumen grades for asphalt pavements as they possess satisfactory adhesion and mechanical properties. In some cases, however, the limits of performance of conventional bitumen 75/25 are being reached due to factors such as increasing rainfall and temperatures, increasing axle weights, tyre pressures, and freight movement, leading to a higher maintenance requirement and higher costs for road owners.
Role of oxidized bitumen 75/25 modifiers in asphalt pavements
While bitumens derived from the distillation or blowing of crude oils possess adequate performance characteristics, increasing the high temperature performance can sometimes detract from the low temperature performance. In the early stages of the development of PMBs for road use, the motivation was to develop steps to counter this effect. Chemical agents that are added to bitumen during manufacture can change its physical, mechanical, and/or chemical properties. Modified binder is a new type of binder whose characteristics have been altered through the use of chemical agents. Since the bituminous binder governs the viscoelastic behavior of asphalt, it plays a crucial role in many aspects of road performance , particularly resistance to deformation and cracking , the two causes of structural failure of thicker pavements.
Uses of Oxidized Bitumen 75/25
Blown asphalt 75/25 uses in the chemical, fuel, paints, lacquers, varnishes, paper-pulp-board, textile processing, road construction, pavement, crack seal and repairmen, civil works, roofing, construction industries; sealing and insulating buildings, adhesive, construction materials additive, dust-binding, insulating and impregnating agent, make rubber and plastic products. The asphalt 75/25 products are for paving. also used in asphalt-based paints for corrosion protection of metals, inlining public works structures, adhesives in electrical laminates, the base for synthetic turf; typical uses for asphalt 75/25 used also for water-proof application and corrosion resistance for pipe coating, Portland cement pavement, hydraulic applications, paint manufacturing, caulking, mastics, and damp proofing. bitumen 75/25 is using insulation and isolation bitumen membrane sheet. Also, Car undercoating Automobile industry is especially required for Blown Asphalt. Vehicle undercoating material is based on Bitumen. Bitumen provides excellent waterproof, dustproof, and noise proof for automobile undercoating.
Application of Blown Bitumen 75/25
Heated Penetration Grade Bitumen under controlled environment is blown with air which controls the Oil Content in the Bitumen while it oxidized. The different grades for suited applications produced are designated by two numbers to indicate the mid-points of their softening point and penetration ranges.
The Blown Bitumen 75/25 should be heated double temperature against the softening point to be able to have flow and viscosity.
Surfaces must be dry, clean and free of loose particles, formwork, curing products, irregularities, slurry, etc.
Blown Asphalt Grade 75/25 Specification
All Petroleum air blown asphalt based products, refined from blowing hydrocarbon with special attention to temperature and pressure of blowing tower. We export all blown grade of bitumen, including air Blown Asphalt 115/15 and 150/5 for soft grades at 75/25.
Packing of Oxidized Bitumen 75/25
oxidized bitumen 75/25in various packages including:
- Kraft paper bags 20 and polyamide bags 50 kg
- 25 kg carton box
- Steel drums 150,180, 200 kg
Also available 40 bags can be placed on the pallet. 20 pallets can be loaded within 20 feet.
Specifications of oxidized bitumen 75/25
| Bitumen 75/25 | Test method | Unit | Specification |
|---|---|---|---|
| Specific gravity @25/25 C | ASTM D70 | (Kg/m3) | 1.05 approx. |
| Penetration @ 25°c | ASTM D5 | mm/10 | 20/30 |
| Softening point °C | ASTM D36 | °C | 70/80 |
| Loss on heating(wt) % | ASTM D6 | Wt. % | 0.2 max |
| Flash point °C | ASTM D92 | °C | 250 min |
| Solubility is CS2(wt) % | ASTM D4 | Wt. % | 99.5 max |
| Spot test | A.A.S.H.T.O 102 | --- | Negative |
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