Crumb Rubber Modified Bitumen
Crumb Rubber Bitumen (CRMB) is a special type of bitumen whose properties are improve by the addition of crumb rubber. Crumb Rubber Modified Bitumen is manufactured by mixing of crumb rubber powder and Bitumen in a high sheared mixing machine at a higher temperature. Crumb Rubber Modified Bitumen can be classified or grouped depending on the penetration and softening point. CRMB is available in grades 50, 55, and 60.
CRMB is the most appropriate for Indian road condition and can be used for wearing courses at heavy trafficked roads, busy intersections, bridge decks and roundabouts for increased life of the surfacing. It is highly durable and dependable economical solution for ravelling undulation, rutting, bleeding, shoving and potholes solutions.
Advantages
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Improve durability
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Lower life-cycle cost
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Less reflective cracking
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Better adhesion
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Less bleeding during construction
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Better drainage
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Substantial noise reduction
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Wider utilization temperature interval
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Better skid resistance.
Product Range of CRMB & Recommendation for use :
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CRMB 50 : recommended for cold climate areas
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CRMB 55 : recommended for moderate climate areas
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CRMB 60 : recommended for hot climate areas
Specification
| Characteristic |
CRMB 50 |
CRMB 55 |
CRMB 60 |
| Penetration at 25 OC, 0.1mm, 100 g, 5 s. |
< 70 |
< 60 |
< 50 |
| Softening point (R & B), OC, Min |
50 |
55 |
60 |
| Flash point, COC, OC, Min |
220 |
220 |
220 |
| Elastic recovery of half thread in ductilometer at 15 OC, percent, Min |
50 |
50 |
50 |
| Separation, difference in softening point (R & B), OC Max |
4 |
4 |
4 |
| Viscosity at 1500C, Poise |
1-3 |
2-6 |
3-9 |
| Thin film oven test and tests on residue: |
|
|
|
| a) Loss in mass percent, Max |
1.0 |
1.0 |
1.0 |
| b) Increase in softening point, OC, Max |
7 |
6 |
5 |
| c) Reduction in penetration of residue at 25 OC, percent, Max |
40 |
40 |
40 |
| d) Elastic recovery of half thread in ductilometer at 25 OC, percent, Min |
35 |
35 |
35 |
