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CRMB
CRMB is manufactured according to IS 17079: 2019.
Crumb Rubber Modified Bitumen (CRMB) is produced by integrating crumb rubber (from recycled tires) into bitumen with specific additives. The modification improves the performance of bitumen, making it more elastic and resistant to temperature variations, deformation, and fatigue.
Specifications for CRMB
| S. No. | Properties | CRMB 50 | CRMB 55 | CRMB 60 | ASTM Standards |
|---|---|---|---|---|---|
|
1 |
Penetration at 25°C (1/10 mm, 100g, 5 sec) |
<70 |
<60 |
<50 |
D5 |
|
2 |
Softening Point (R&B), °C, Min |
50 |
55 |
60 |
D36 |
|
3 |
Elastic Recovery at 15°C, %, Min |
50 |
50 |
D6084 |
|
|
4 |
Flash Point, COC, °C, Min |
250 |
250 |
250 |
D92 |
|
5 |
Separation, Difference in Softening Point, °C, Max |
4 |
4 |
4 |
– |
|
6 |
Viscosity at 150°C, Poises |
1-3 |
2-6 |
3-9 |
D2170/D4402 |
|
Thin Film Oven Test & Test on Residue |
|
|
|
|
|
|
7a |
Loss in Mass, %, Max |
1.0 |
1.0 |
1.0 |
D6 |
|
7b |
Reduction in Penetration of Residue at 25°C, 100g, 5s, %, Max |
40 |
40 |
40 |
D5 |
|
7c |
Increase in Softening Point, °C, Max |
7 |
6 |
5 |
D36 |
|
7d |
Elastic Recovery at 25°C, %, Min |
35 |
35 |
35 |
D6085 |
Applications of CRMB
- Road Construction (Highway and main road surfacing)
- High Traffic Locations (Bus lanes, runways)
- Temperature Resistance (Prevention of deformation under high temperatures)
- Fatigue Resistance (Improved resistance to repeated heavy loading)
- Cost-Effective (Lower maintenance costs and better life cycle performance)
Key Benefits of Modified Bitumen:
1. Enhanced Durability: Both PMB and CRMB provide increased resistance to cracking, rutting, and deformation, making them ideal for roads subjected to heavy traffic.
2. Increased Lifespan: These modified bitumen types extend the lifespan of pavements and reduce maintenance costs over time.
3. Environmental Benefits: CRMB uses recycled tire rubber, helping reduce waste and promote sustainability.
4. Better Performance in Extreme Weather: Both PMB and CRMB are effective in handling extreme weather conditions, whether it’s high heat or cold climates.
In conclusion, Polymer Modified Bitumen (PMB) and Crumb Rubber Modified Bitumen (CRMB) are advanced bitumen solutions designed to offer high performance for demanding road construction and maintenance projects. These products improve road durability, reduce maintenance costs, and increase the lifespan of roads, especially in areas with heavy traffic and extreme weather conditions.