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Road construction asphalt binder course

Six-lane extension of the BAB A1 between Bramsche and Osnabrück, Germany

Project data:

  • Paving the binder course: AC 22 BS
  • Continuous paving with a feeder (screed width: 5.50 m)
  • Bitumen: 25/55-55 A
  • Mat height: 8 cm
  • Daily output: 1.000 t

Requirements and compaction:

  • Compaction requirement: 97 %
  • Main compaction with two tandem rollers BW 174 AD AM 2 and
  • BW 174 AD AM (10 t each), each with up to 8 passes, v = 4 km/h
  • Post compaction: static/ironing
  • BW 184 AD (13 t) and one tandem roller (10 t)


The AC 22 BS binder is considered difficult to compact and has thus been treated with double vibration. The following settings (see photos) were chosen under favourable ambient temperatures of 20 °C and light wind.

The Evib target value (Evib = 250 MN/m²) was reached after 8 passes.
 

 

Basic rehabilitation of the highway A48 as an asphalt construction, Germany

Project data:

  • Binder: AC 16 BS
  • Pavement of an asphalt binder "hot vs. hot"
  • Bitumen: 25/55-55 A
  • Thickness: 8,5 cm
  • Total area: 70.000 m²
  • Total production: 16.000 t
  • Production/day: 3.500 t

Compaction:

  • 5 Tandem rollers BW 174 AD-AM (10 t operating weight)
  • No. of passes: 4 
  • Working speed: 4-6 km/h
 
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