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HI BOND polymer modified bitumen (PMB), developed in technical alliance with M/s. E.I.DuPont India Ltd. Using ‘Elvaloy’ Reactive Elastomeric TerPolymer (ETP), are being used as a means of better combating the effects. Increasing traffic volumes, vehicle loads and tyre pressures are causing accelerated degradation of our road pavements due to brittleness at lower temperatures.
PMBs are generally considered to provide prolonged life or enhanced pavement performance. In sprayed seal and interlayer (membrane) applications, polymers can greatly prolong pavement life by inhibiting reflective cracking. In dense-graded asphalt applications, PMBS are effective in reducing rutting and improving fatigue crack resistance. The higher shear resistance provided by PMBs can give beneficial effects in roundabouts, tight corners and other high stress areas. Polymers have also demonstrated the ability to prolong the life of open-graded surfacings by allowing thicker binder films, which are less prone to oxidation and tougher films that resist collection of foreign matter and dust, thus maintaining the desirable water drainage capacity of thse mixes.
We are also manufacturing Highly Modified Asphalt (HIMA) in association with Kraton Polymers.
Hi-Bond is an ideal product for wearing courses on
Recommended temperature for application
| PROCESS | TEMPERATURE RANGE |
|---|---|
| 1. Mixing with aggregates | 170-185°C |
| 2. Laying | 150-170°C |
| 3. Compacting | Over 140°C |
| 4. End of compaction | 110-120°C |
Several modifiers have been evaluated by the CRRI in India as well as US federal highway administration for their:
| Sl No. | Characteristics | Grades and Requirements | ||
|---|---|---|---|---|
| PMB 64-10 | PMB 70-10 | PMB 76-10 | ||
| (1) | (2) | (3) | (4) | (5) |
| (A) Tests to be carried out on Original Binder | ||||
| i) | Softening point (R and B). °C, Min | 60 | 65 | 70 |
| ii) | Elastic recovery of half thread in ductilometer at 15 °C, percent, Min | 70 | 70 | 70 |
| iii) | Flash point, COC, °C, Min | 230 | 230 | 230 |
| iv) | Viscosity at 150°C, pas, Max | 12 | 12 | 12 |
| v) | Complex modulus (G*) divided by Sin delta (G*/sin δ) as Min 1.0 kpa 25 mm Plate 1 mmm Gap at 10 rad/s at a temperature, °C |
64 | 70 | 76 |
| vi) | Phase Angle (8) degree, Max | 75 | 75 | 75 |
| vii) | Separation, difference in softening point (R&B), °C, Max | 3 | 3 | 3 |
| viii) | FRAASS breaking point, °C,, Max | -10 | -10 | -10 |
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New technologies and development of new methods of constructions constitute an important contribution to the solution of road maintenance problem.
