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CRMB is special type of bitumen whose properties improved by addition of crumb rubber & modifier etc. Thus altering the physical properties of bitumen making it more resistant the temperature variation, weather & high traffic loads, leading to enhanced pavement life, reduce maintenance costs and excellent driving comfort.
Types of CRMB are:-
• VIC CRMB 50 : Ideal for cold climatic conditions.
• VIC CRMB 55 : Ideal for moderate climatic conditions.
• VIC CRMB 60 : Ideal for hot climatic conditions.
| Crumb rubber |
Test Method | ||
CRMB 50 | CRMB 55 | CRMB 60 | ||
Penetration at 25C, 0.1 mm | <70 | <60 | <50 | IS 1203 – 1978 |
Softening Point, C min. | 50 | 55 | 60 | IS 1205 1978 |
Ductility at 27C, cm | – | – | – | IS 1208 1978 |
Fraass Breaking Point C, Max | – | – | – | IS 9381 1978 |
Flash Point by COC, C, Min | 220 | 220 | 220 | IS 1206 1978 |
Elastic Recovery at 15C, Min | 50 | 50 | 50 | IRC SP 53 2002 |
Separation C, max | 4 | 4 | 4 | IS 1206 ** – 1978 |
Viscosity at 150C, Poise | 1 – 3 | 2 – 6 | 3 – 9 |
|
Thin Film Oven Test (TFOT) on Residue (IS 9382 – 1992) |
| |||
Loss in wt, %, Max | 1 | 1 | 1 | IS 9382 1982 |
Softening Pont Increase, C, Max |
7 |
6 | 5 | IS 1205 1978 |
Reduction in penetration at 25C, %, Max |
60 |
60 |
60 | IS 1203 1978 |
Elastic recovery at 25C, Min | 35 | 35 | 35 | IRC SP 53 2002 |
Advantages of Modified Bitumen (PMB/CRMB) :
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