As a vehicle stops, the force drives down into asphalt and supporting layers, causing stress and fatigue where the tires meet the road.
As a vehicle stops, Para fibers spread the force throughout the treated, layer, reducing stress and fatigue where the tires meet the road.
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Thickness: 6 cm
Cracking Reflective Resistance After 2.5 hours
Thickness: 6 cm
Cracking Reflective Resistance After 10.5 hours
Parafibered asphalt builds stronger asphalt surfaces, and stronger roads are safer roads. Parafibered asphalt reduces maintenance, thereby reducing future costs and extending the useful life of pavement. Asphalt reinforced with Parafiber has improved tensile strength, resilient modulus and fatigue resistance.
| Color | Density (gr/cm3) | Lenght (mm) | Diameter (mm) | Tensile Strength (MPa) | Melting Point (°C) | Water Abs. | Alkali/Acid Resistance |
|---|---|---|---|---|---|---|---|
| White | 1.18 | 12-18 | <0.13 | >1000 | 800-900 | Nil | Good |
Parafiber is an engineered and versatile additive for asphalt which is combination of special fibers, chemical components and polymers that significantly improves quality of asphalt mixes. The use of Parafiber in asphalt mixes is approved and recommended by road authorities and consultants in many projects.
Quality control tests for fiber and polymer include dimension, tensile strength and other mechanical properties, which can be performed according to the following standards.
ASTM D7508, ASTM D7138, ASTM D570, ASTM D885-85, ASTM D2258
Parafiber dosage will be designed according to the mix design and properties, weather condition, traffic volume, layer’s thickness and other factors which affect the final result.
Generally recommended dosage rate of Parafiber is 2 kg per ton of asphalt mix.
Quality control tests for the Parafiber-ed asphalt must be performed according to following table. The results of these tests should be reported by the consultant or QC team after production of modified asphalt and they should compare with plain asphalt results.
| Test | Plain Asphalt | Parafiber-ed Asphalt |
|---|---|---|
| Resilient Modulus Acc. to ASTM D4123 | 1 | 1.3 |
| Dynamic Creep Acc. to BS-EN 12697-25 | 1 | 2 |
| Indirect Tensile Fatigue | 1 | 2 |
1- Parafiber can be added directly to the mix. When added to the mix, it must be added to the asphalt stream before it hits the aggregate.
2- The mixing time must be between 50 to 60 seconds.
3- It is extremely compatible with bitumen and thus very versatile in terms of addition.
15 – 25 kg bag according to client order.
• Test method : ASTM D4123
• Test load : 800 N haversine load of 0.1 s and rest time of 0.9 s
• Pulse count : 100 preconditioning pulses and 5 test pulses
• Test temperature : 25°C
• Test specimen : cylindrical specimens 100 mm in diameter
• Estimated poisson ratio : 0.35
• Test method : BS DD226 draft method
• Test load : 100 kPa square pulse load of 1.0 s and rest time of 1.0 s
• Test temperature : 50°C
• Test specimen : cylindrical specimens 150mm in diameter
• Test method : EN12697-24
• Fatigue Testing Using Indirect Tensile
• Load shape : constant stress is 250 kPa, load time is 0.25 sec and rest time 1.25 sec
• Test temperature : 25 ° C
• Test specimen : cylindrical specimens 150mm in diameter
• Test method : semi circular bend (SCB)
• Test load : cyclic loading
• Test temperature : 0°C
• Test specimen : half circle with a diameter of 15 cm
• Test method : simulation
• Test load : 690Kpa
• Test temperature : 20°C
• Test specimen : slab
