RaodGrip POLYMER MODIFIED BITUMEN
IS : 15462: 2004 (ISI MARKED)
Description
Pavements designed and constructed for heavy duty traffic and extreme weather conditions require specially designed engineered Bitumen Grades. By changing the characteristics of normal bitumen with the addition of a polymer, either they are of elastomeric nature or elastomeric, we succeed to obtain bitumen that allow the mixture to be more cohesive, with much more strength and significant higher resistance to parameters like fatigue and permanent deformations for road pavements.
Uses of Polymer Modified Bitumen:
The main resons to modify asphalts with polymers could be summarized as followes,
- 1) To obtain softer blends at low service temperatures and reduce crackin.
- 2) To reach stiffer blends at high temperatures and reduce rutting.
- 3) To reduce viscosity at layout temperatures.
- 4) To increase the stability and the strength of mixtures.
- 5) To improve the abrasion resistance of mixtures.
- 6) To improve fatigue resistance of mixtures.
- 7) To improve oxidation and aging resistance.
- 8) To reduce structural thickness of pavements.
- 9) To reduce life costs of pavements.
Pavements Conditiopns to use PMB:
- 1) The development of very stressed pavement.
- 2) Roads for high and heavy traffic.
- 3) High loading.
- 4) High temperature amplitude.
- 5) More durable pavement.
- 6) Draining pavements.
Grades of Plymer Modified Bitumen:
Polymer MOdified Bitumen is available in PMB 40, PMB 70 & PMB 120 Grades.
| Maximum Atmospheric Temperature,°C | ||||
| Minimum Pravement Temperature, °C | <35°C | 35°C TO 45°C | >45°C | |
| <-10 | PMB 120 | PMB 70 | PMB 70 | |
| -10 To 10 | PMB 70 | PMB 70 | PMB 40 | |
| >10 | PMB 70 | PMB 70 | PMB 40 | |
PROPERTIES OF ROADGRIP POLYMER AND RUBBER MODIFIED BITUMEN
|
S.No |
Characteristics |
Grade of Emulsion | Method of Test, Ref to | |||||
|
PMB 120
|
PMB 70
|
PMB 40
|
IS-No.
|
Annex of IS 8887:2004
|
||||
| 1. | Penetrarion at 25°C, 0.1 mm,100g. 5s. |
90 to 150 |
50 to 90 |
30 to 50 |
1203 |
-- |
||
| 2. | Softening point (R&B), °C, Min |
50 |
55 |
60 |
1205 |
-- |
||
| 3. | FRAASS breaking point, °C, Max |
-20 |
-16 |
-12 |
9381 |
-- |
||
| 4. | Flash point, COC, °C, Min |
220 |
220 |
220 |
1209 |
-- |
||
| 5. | Elastic recovery of half thread in ductilometer at 15°C, percent, Min |
70 |
70 |
70 |
-- |
A |
||
| 6. | Separation, difference in softening point(R&B), °C, Max |
3 |
3 |
3 |
-- |
B |
||
| 7. | Viscosity at 150°C, Poise |
1-3 |
2-6 |
3-9 |
1206(PART 1) |
-- |
||
| 8. | Thin film oven test and tests on residue:
(a) Loss in mass,percent,Max (b) Increase in softening point,°C, Max (c) Reduction in penetration of residue, at 25°C, percent, Max (d) Elastic recovery of half thread in ductilometer at 25°C,percent, Min |
1.0 7 35 50 |
1.0 7 35 50 |
1.0 7 35 50 |
9382 1205 1203 -- |
--
-- -- -- B |
||
|
"(1)Relevant to snow bound cold climate areas."
|
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