Paving Grade BitumenBitumen 60 / 70
Bitumen penetration grade 60/70 means the penetration value is in the range 60 to 70 at standard test conditions which commonly used as a Paving Grade. This bitumen is produced through aeration on vacuum bottom (the raw material used for making bitumen left in vacuum distillation column in oil refineries) in bitumen production units. Its penetration grade ( the measure of bitumen hardness) is between 60 to 70.
Bitumen 60/70 is one of the most used bitumen grades and it’s a basic material for all other bituminous products.
Intended use
Paving Grade Bitumen 60/70 is semi hard penetration grade bitumen can be used primarily for asphalt concrete and SMA in wearing courses for light and medium traffic, assuming the requirements for mix resistance to rutting are met.
Specification
| REQUIRMENT | ||||
| TEST METHOD | UNIT | MIN | MAX | |
| PENETRATION@ 25°C | ASTM D5 | 0.1 mm | 60 | 70 |
| SOFTENING POINT | ASTM D36 | °C | 49 | 56 |
| DUCTILITY@ 25°C | ASTM D113 | Cm | 100 | – |
| LOSS ON HEATING %WT | ASTM D6 | % (m/m) | – | 0.2 |
| FLASH POINT | ASTM D92 | °C | 250 | – |
| SOLUBILITY IN CS2 %WT | ASTM D4 | % (m/m) | 99.0 | – |
| DROP IN PENETRATION AFTER HEATING | ASTM D5 | % | – | 20 |
| DENSITY @25°C | ASTM D70 / D3289 | kg/m3 | 1.01 | 1.06 |
process temperatures
| At laboratory | |||
| Sample compaction temperature (Marshall samples or samples compacted in gyratory press) | 135–140°C | ||
| At mixing plant | |||
| Bitumen pumping temperature | >130°C | ||
| Temperature of bitumen for bituminous mixture production | 155–165°C | ||
| At site | |||
| Minimum temperature of the supplied bituminous mixture (spreader’s hopper) | 145°C | ||
| Minimum compaction temperature of bituminous mixture | 120°C | ||