Cutbacks are bitumen preparations in which the viscosity of the binder has been reduced by the addition of a volatile solvent, normally derived from petroleum.
Cutback products are typically used for spraying and some mixing applications. The advantage of cutbacks over emulsions is much higher residual bitumen content, typically over 80% compared with over 40-65% for Bitumen emulsions. The result is more Bitumen left on the roadway after curing, for the same volume of binder applied.
GRADES BITUMEN STANDARD | ||||||
---|---|---|---|---|---|---|
PROPERTY | UNIT | MC30 | MC70 | MC250 | MC3000 | STANDARD |
Penetration @ 250C, for 5 Sec | CST | 30/60 | 70/140 | 250/500 | 3000/6000 | D2170 |
Flash Point, Min | 0C | 38 | 38 | 66 | 66 | D1310 |
Residue from Distillation to @ 360 (0C) min | %VOL | 50 | 55 | 67 | 80 | D402 |
Test on Residue from Distillation | ||||||
Retained penetration after thin film oven test | CM | 120/250 | 120/250 | 120/250 | 120/250 | D5 |
Ductility @ 25 (0C) -cm/min after thin oven test | CM | 100.0 | 100.0 | 100.0 | 100.0 | D113 |
Solubility in Trichloroethylene, Min | % | 99.0 | 99.0 | 99.0 | 99.0 | D2042 |
Water, Max | %VOL | 0.2 | 0.2 | 0.2 | 0.2 | D95 |
GRADES BITUMEN STANDARD | |||||
---|---|---|---|---|---|
PROPERTY | UNIT | RC70 | RC250 | RC3000 | STANDARD |
Kinematic viscosity @ 600C, | CST | 70/140 | 250/500 | 3000/6000 | D2170 |
Flash Point, Min | 0C | - | 27 | 27 | D1310 |
Residue from Distillation to @ 360 (0C) min | %VOL | 55 | 65 | 80 | D402 |
Test on Residue from Distillation | |||||
Penetration at 250C, 100g, 5 sec | CM | 80/120 | 120/250 | 120/250 | D5 |
Ductility @ 25 (0C) min | CM | 100.0 | 100.0 | 100.0 | D113 |
Solubility in Trichloroethylene, Min | % | 99.0 | 99.0 | 99.0 | D2042 |
Water, Max | %VOL | 0.2 | 0.2 | 0.2 | D95 |